Secrets of the Marshall 1959 Super Lead - 100W VINTAGE 1971 TUBE BEAST REPAIR!

In this video, we will assess the condition of a CLASSIC 1970s Marshall JMP Super Lead 100W head and begin the troubleshooting and repair process. The model is a 1959. This is not a Plexi, as the faceplate is brushed metal, not plexiglas. This is the 100W version of the 50W 1987.
PART 2:
• Now I Need a Hearing A...
----------------------------------------------
Check out our sponsor, Native Sons Goods. Use the code GUITOLOGIST10 for 10% off your entire order.
www.nativesonsgoods.com/
--------------------------------------------
WAYS YOU CAN SUPPORT THIS CHANNEL:
♠Stand in the Middle of the Street Naked Screaming "LONG LIVE THE GUITOLOGIST"!
OR
♠Send an unwanted piece of gear or send a small tip via Paypal: [e-mail]
Thanks for your support!
♠STUFF I USE
-5A Variac: amzn.to/2FNWthU
-Jameco Isolation Transformer: amzn.to/2PRv1Fa
-Fluke 87: amzn.to/2DwHjvr
-Yotec 936 Soldering Station: bit.ly/2JqB1Vw
-Sealody SSA51 soldering station: amzn.to/2DJTS7P
-Black and Decker Heat Gun: amzn.to/2DWpDhr
-Geekcreit® LCR-T4 Mega328 Transistor Tester bit.ly/2J9uLSA
-HT02 Handheld Infrared Thermal Camera bit.ly/2LXfLoD
-Solderless Breadboard: bit.ly/2stkVAq
-Breadboard Jumper Wires: bit.ly/2JowaEh
-Geekcreit® XR2206 Function Signal Generator DIY Kit bit.ly/2LYBvkb
-Contact Cleaner: amzn.to/2FVitro
-Deoxit Fader Cleaner: amzn.to/2LPwtsE
♠RECORDING
-JVC Everio Camcorder amzn.to/2RLIleU
-Andonstar USB Microscope: bit.ly/2q8QIWz
-Articulated Boom Arm with Cam Mount: amzn.to/2Hlo2AX
-Shure Beta 87A amzn.to/2rNPnoW
-EV 635A Omnidirectional Dynamic Mic amzn.to/2pR8HQT
♠BOOKS
-RCA TUBE MANUAL amzn.to/2GOBVqS
-DESIGN AND CONSTRUCTION OF TUBE AMPLIFIERS: amzn.to/2HSNMne
-Designing Tube Preamps for Guitar and Bass: amzn.to/2DK5tmt
♠2006 FENDER AMERICAN STD TELECASTER PICKUPS
-TV Jones Magnatron Neck: amzn.to/2q1zQjD
-Seymour Duncan Vintage Stacked Bridge: amzn.to/2GyZjrK

[@jond63]

Hey.....THAT’S MY AMP! On the bench, naked, being poked and prodded by the Guitologist while being watched by millions...I guess that makes this amp porn. Wait....so does this mean that my Marshall now has to join the Screen Actors Guild of America? Get a card and pay union dues? Ha! Looking forward to getting her back. As for the history of that certain amp, it was bought by a good friend of mine back in 1983 down in Louisiana. It also came with the matching 8x10 cabinet loaded with vintage Celestion speakers. Upon returning to Louisville he informed of his purchase and within a few days I was invited over to his parents house (still living with mom and dad) while they were at work. He had the beast set up in the garage, no power attenuator, only an EH Little Big Muff for dirt, and his Gibson SG plugged in. What I saw and heard (and felt more than anything) changed my life. When I plugged into it after he him, I’ll never forget that feeling of raw power...that thrill and yes...that intimidation. It was like jumping on the back of a crazed beast (good analogy, Brad) or like getting behind the wheel of a high performance automobile. I had only played solid state low-wattage amps up to this point and had only been playing guitar for about 2 years (I was only 19 years old, yup...still living with mom)...so this was not only the first tube amp I ever played thru, it was the first Marshall I had ever played thru as well. Fast forward, many Marshalls later around 2010, when my buddy Vince decided he wanted to finally part company with this amp, I was the first person he called. I bought it with cash and a ticket to see Roger Waters. A great show but more importantly a great amp...part of my own music history. Thanks for the TLC, Brad.

[@freepress8451]

Bet you had a shiver watching video

[@TheGuitologist]

Amp cuckolding. :P

[@TheGuitologist]

BTW, I went to that Roger Waters show too.

[@trillrifaxegrindor4411]

you BASTARD.......kidding lucky guy @@TheGuitologist

[@WillyMcCoy50]

So are you going for the cap and tube feast or just the life support option?

[@Dragonblaster1]

Marshall is about an hour down the road from my house. I took my basket-case JCM800 2 x 12 50W Master Volume combo (4212) to them. She still worked, but knobs were broken, the speaker cloth and Tolex were ripped, the screws were rusty and the plastic fittings were scuffed and cracked. Marsha had had a hard life since 1983, when I first lugged her to my car from the guitar shop (alas, now gone). I am an operatic metal guitarist and singer, and the amp was sticky with beer spills and smoky-smelling with cigarette burns after years of gigs. I'd had a couple of retubes over the years, but that's about it. The guy at Marshall quoted me a less terrifying price than I had feared, but he told me that it was impossible to replace the speaker cloth without damaging the Marshall logo. But then he casually leaned forward and snapped the logo in half, saying, of course if they damaged it, they would pay for it (and those are more expensive than you might think), The only thing they could no longer get was the old "JCM 800 50 Watt LEAD" plate. They retubed and recapped, replaced the missing knobs, the Tolex, the speaker cloth, the Marshall logo, the feet, the corner pieces, the none-too-useful handle and the screws. There are still battle-scars on the control panel, but otherwise she looks good as new, ready for another 36 years' rocking. I finally got a case for her, too, and I no longer smoke or rest my beer on the amp. And I sourced a reproduction laser-cut 50W Lead plaque. My bass player and rhythm guitarist have all replaced amps over the years, and bring spares to gigs: I've never had to, and Marsha has never, ever let me down. She's a tank.

[@TheGuitologist]

Great story, sir! Thanks for sharing!

[@Dragonblaster1]

Hey, I love your videos, and I love Marshall amps! It is a sheer accident of birth that I live just down the road from Marshall. It was a really great amp museum, seeing all the other old Marshalls there for refurb or repair, and the tech showed me around their repair facility which, as an electronics engineer, I really appreciated.

[@craighawley3920]

I took my JCM2000 DSL100 to Marshall. They are about 20 mins from me. I was shocked how reasonable they were for servicing. Worth a walk around the factory when it is open as usual.

[@michaelknight4041]

My birth was a sheer accident as well except I live just down the road from a crackhead. Oh fate!, why doth thou mock me!?

[@robertjohnson8205]

I can't tell you how much my 9 year old son and I love your repair videos! Amazing!

[@hughes2397]

The Super-Lead is the best amp ever made, hands down. They've always had such KILLER tone, and they'll fit ANY genre of music, whether it being rock, country, blues, and they'll go from clean as glass, to dirty as Hell. It's the last amp you'd EVER need.

[@sting1111]

Thank God there are guys around like us who give these beasts new life. Idols: you, Uncle Doug, D-lab.

[@andYz00m]

Dont forget Coleen Fazio!

[@sting1111]

@@andYz00m Thank you for that. I never knew of her.

[@IrishStewGuitar]

I have a 50 watt version similar to this amp and i lent it to somebody who plugged headphones into the speaker outlet. when i got it back and plugged it in it almost went on fire. i know it is going to cost a fortune to repair so it has been sitting for years doing absolutely nothing but gather dust. it was without doubt the best amp sound i ever heard.i saw one for sale on e-bay for £3.5 k so good luck with the repair on the one you're working on

[@rockyj832]

Glad to see more vintage Marshall on the bench action! Thanks for all the great content.

[@roncarter2188]

Always look forward to seeing new videos from your channel. Very cool Marshall amp, nice job!

[@mikewallace1270]

Just stumbled upon this video and ended up really enjoying it. I used to have a 71 Marshall just like that.

[@TheGuitologist]

Thanks Mike.

[@sidneysnottley6414]

Interesting as always - Hopefully in Pt 2 we'll get the answer on why the extra input/outputs on the back,

[@kg2nc]

Great video Brad looking forward to seeing the next episode. Thanks for everything

[@JacobNNorton1982]

I love this video. I’ve never really been a gear head but you’re making me with these videos. Keep them coming

[@dokdorian]

i personally own a couple of marshall heads from 70s. 1972 JMP 50w and 1978 JMP 2203 Master. love my marshall amps! i wish u were my amp tech!! what a video! cant wait to c next one man! keep it up! subscribed!!

[@TheGuitologist]

Welcome aboard!

[@gcf7175]

I got my 15 Super Lead..Cheap to buy, all the power I need and none of the high cost maintenance issues. Another great video!

[@BIZARBIES]

Lolol.. Thats like someone saying that a Pontiac Fiero is cheap to buy/service and is a good car when talking about a Ferrari Testarossa ... not in the same league. No offense btw.

[@TheGuitologist]

Whatever works best for YOU. That's the name of the game. Not everyone could really open up a 100W non-master Marshall and get the most out of it. Same as a Ferrari. A lot of those just sit in garages, never driven.

[@10100rsn]

Holy crap.. You're in the video wiggling that switch trying to make it work and my lights here are flashing in my home. Freaked me out. I was like "How'd you get ... Oh. It's just the damn wind." ;P

[@TheGuitologist]

Or WAS it???

[@charlesb7831]

What a sweet amp! Looks like it's just been sitting for some time after it had its problem surface. Love to hear that amp.

[@ReWindElectricOld]

Love those detailed closeups and discussion of the old Marshall guts! btw - I regularly enjoy your channel. Keep up the great work. Fascinating stuff. James - ReWind Electric, LLC

[@cyrus1357]

I learn so much from your videos man. I built my first kit amp not long ago and it rocks.

[@Andy_Yates]

Love my '72 50 watt lead. It's stupid loud on 2, but it's soo good, and the bass channel is pretty reminiscent of the JTM. Looking forward to the next videos!

[@suzukiyesteryear]

Wow! Just WOW! What a trip down English History!!! An era that will never be repeated and a generation of hearing impaired.... For a lowley drummer, Jim Marshall was truly a maker of the stuff of dreams...

[@Chabub]

at this precise momoment Johan Segeborn is over the Atlantic

[@madtuned5150]

Cat Man lol

[@katman11]

LOL

[@fatsuperfly]

Love your vids!! Thank you for these amp vids

[@casperboo5465]

Interesting Brad, looking forward to Pt2, Cheers

[@jds9958]

I wish I never got rid of mine. Best and cleanest amp I ever had.

[@elephantcup]

I had a '71 100w super lead in the 80s when I was in high school. Paid $250 for it. Looked exactly like that one in every way. Every time I see one I wonder if it was the one I owned and sold.

[@maddmatt55]

Hi Brad. Qc in uk frequently used nail varnish to mark where a test point had been checked. Nice and cheap, built in brush and quick drying. I’ve done this myself on screws which also shows that the nuts have not been disturbed.

[@joemorrow8411]

Yesterday in the rain I had to hit my brakes,,a plie of trash had an amp sitting in it,, Randall RG 120 115 Commander 1,,castors still on,,,I believe its 1970s something,,,in decent shape,, letting it dry out,,,

[@MrNatural_OG]

doing god's work

[@joemorrow8411]

@@MrNatural_OG 😁😁🍻🍻👍

[@BIZARBIES]

My friend has had the 212 for 30 years he got it used, its from the 70s.. its a tank. Hope it works!

[@TheGuitologist]

Dude...SCORE! Tell me you got video of that poor thing sitting in someone's trash at the curb!

[@whatyoumakeofit6635]

@@TheGuitologist ....ya....talk about a cliff hanger. And those guys thought the video ending without a repair was stressful. Yeesh

[@MrNatural_OG]

love these diagnose then repair/restore vids, but i've learned. you have become the Hitchcock of the youtube repair podcasts. will wait at least for "Episode 2 ~The Marshall from Hell" to watch this one, I fear a cliffhanger here.

[@TheGuitologist]

You know the drill. Maybe this one will be my "Usual Suspects" amp video where you don't see the ending coming until it slaps you in the face.

[@patreidcocolditzcastle632]

love this brad awesome amp good job as always.excellent vid x

[@johnny96888]

dude awesome channel you are very informative and well spoken, very well done!

[@alanwoodwind5265]

The unused hole is for a tremolo footswitch on the Super Tremolo models. All they had to do was punch the hole out for a 4th preamp tube and the switch hole and you were in business to wire it up.

[@paulh5926]

If you recap/tube it, make sure you measure its real output power for us. Always curious how many watts these things really put out. Great vid, looking forward to the next!

[@rasmuslkke8233]

Good point - some people say these old Superleads put out about 150 watts when cranked. It would be nice to know for certain :)

[@whatyoumakeofit6635]

That would be a great bonus to these amp videos.

[@michaelcoriglianol7197]

I cant wait for part 2

[@SteveAaron]

I had a 1968 Super Bass (Model 1992) a beast!! And a 1969 Super Lead (Model 1959). I serviced my share of them too!

[@bretfuzz925]

I have a ‘68 Superbass the previous owned had partially converted to superlead. A beast it is!

[@mischef18]

Be interesting to see how much the guy want's done. We do day-month-year in NZ also plus drive on the other side of the road to you guys although being way down under the driving upside down takes real skill.

[@theonemodifier]

technicians and good soundmen are the real rock stars!

[@jeffkellogg76]

Hey Brad , while yard saling this weekend I bought a Zenith model X 334 W 2-2345 am/fm tube radio. I am thinking about adding an input jack and a switched output jack to it to make a small bedroom guitar amp. It has 7 tubes in it and a 7” elliptical speaker which is working as is the radio & amplifier. I am was thinking about tapping into the selector switch for the input and using the switched output jack to cut the small elliptical speaker out of the circuit while I use an external 12” speaker for guitar. I can access a schematic on the internet and was also thinking of shotgunning all the caps while in there. Any thoughts that might help?

[@TheGuitologist]

If it has a power transformer, it could be a cool project. You just need to find where the audio amplifier begins in the circuit and tap in your input right there and make the radio incoming signal off the detector/demodulator stage switchable going into the audio amp stage. This way you can keep it as a radio and guitar amp both.

[@varszegimarcell]

Back in the day, you was able to contact Marshall directly, to order your very own amp, there was even an option for factory modding the amps to meet your specific needs. Randy Rhoads got his hot-rodded white plexi heads like this too. (Maybe this can explain the factory checked extra jacks on the back.)

[@davidclark3603]

Your videos are brilliant!

[@BlaineLudeman]

hi, where can I find a tube layout for a 90s red knob fender "the twin"? something to show where each tube is supposed to go? thanks!

[@MisterTee]

I hear these amps are quite pleasant to play.

[@theonemodifier]

hey man, how do you find part ( 2)? it doesn't autoplay, it just ends and gives you a choice of two other diff video's. could someone post a link here?

[@guitarguts666]

Stupid KZbin would let me watch the video until I completed a survey below not the typical one that shows up the overtop the video it wanted to know of the show was informative and entertaining I gave you 5 stars bro

[@TheGuitologist]

That's interesting. Thanks for the top marks, man. I'm sure that helps me a lot.

[@wesleymorris1]

Those ohm selecters for the output, wear out the contacts get bent out and stop touching each other, if they where switch alot anyway, I took mine apart and cleaned them and that was one of the problems with mine. I don't understand the 5 different output either that don't make sense

[@TheGuitologist]

Yeah, just an odd mod.

[@kristopher6031]

You know what Brad? I love these videos so much and I'm going to buy a native sons guitar strap.

[@tchender1]

Mojo Jojo in the background.. Outstanding!!

[@freepress8451]

curious does ohms law come into play with mono amps re: additional speaker jacks for cabs wired in parallel I take it, sorry so used to working on stereo amps

[@robertwhitham5109]

I have a 1975 one. Super awesome sound and SUPER LOUD! Loud drummer? No problem, can vibrate the skin basher back to the stone age. Also the 'M" on my logo is gone. I knocked it off years ago. It now says "arshall". It is still completely awesome. Bought it and a JCM 800 4X12 for $650 in the late 80's. Put Vintage 30's 16 ohm in it. Best sounding cab I have ever owned. Sold it when I moved to Seattle. Buyer made a point to call me back and thank me for selling it to him. He couldn't believe the Fantastic sound. I miss that cab. Now I'll have to buy a Rec 4x12 cab.

[@MiximusMaximus]

I have a '73 Super Lead 100 watt. It is painfully loud when you get it up to it's glorious rage in volume. It is the top amp

[@robertkidd6270]

Hey bud I've got the same amp from 73 too ...sounds amazing no doubt about it

[@semajdis]

Brad, have you any tips or suggestions on how to clean up the 50 years of corrosion and cr*p on a chassis like this? btw the one on your bench seems to be missing a mains voltage selector between the power cable and the speaker impedance selector. That could be what one of those blank plates is for.

[@TheGuitologist]

Start with a damp cloth. Warm water and regular dish liquid to wash off the grime. After that dries you can use 1000 grit steel wool or a soft wire brush and Dremel to knock off corrosion. Then you apply some wax at the end to seal it and prevent future corrosion.

[@jonathanduffett8374]

I’ve had great success with removable parts in the dishwasher.. Even stripped an old chromed snare drum and put it it in parts in the dishwasher! Came out lovely. For corrosion and rust then vinegar soak for removable bits for a few hours and cleaned an intact chassis with vinegar and a toothbrush. Last one was a 1962 Fender Super, lots of crud and rust but bit by bit vinegar and toothbrush followed by scrunched up aluminium foil (I’m a Brit!) to rub the rust off. The foil cleans it without scratching unlike a wire brush or dremel. Bit of elbow grease and it makes your hands dirty filthy but it does a great job. Hope that helps. Jonny

[@jonathanduffett8374]

good 'un Cheers! Good points. Wouldn’t recommend scrubbing anything with lettering and the foil works great for getting rust off much less damaging than wire brush. Have used on aluminium parts seems ok. Try it on a small test area first. Always wash off the vinegar with a water dampened cloth and agree with Guitologist re waxing after to protect. Can turn a cruddy looking old chassis into a thing of beauty.

[@Twobarpsi]

Great video 🤘🤘🤘!!

[@SeanKerns]

I haven't watched far enough yet to see what the actual problem was, but any time someone says they "checked" the fuse, and it was "good", I ask how they "checked". Mostly, people look and if they see a wire inside the fuse, they pronounce it "good", but I've seen (and been fooled by) a lot of fuses that blew down at the end where I couldn't see it. But check with a meter, they had no continuity.

[@Dragonblaster1]

My Marshall JCM800 4212 HAF (Heavy as Fuck) combo was in a sad state after years of heavy metal gigs, getting knocked over, beer spills, cigarette burns, etc., etc. As I live not far from Marshall, I took it to them for restoration. I ordered new knobs, a re-tube, new caps, Tolex, speaker cloth, corners, screw, feet... you name it. I also said I wanted a new Marshall logo, and the sales guy shook his head a little apologetically and said they were actually really expensive because the old ones have to be specially made. The he walked up to the amp, grabbed the logo and pulled until it snapped, saying, "Oops. Now we have to replace it for free because I accidentally broke it." They did a master job on Marsha, so she's ready for another 30 years' rocking. There are still some battle scars on the front plate, but she's cherry otherwise. The thing I really like about Marshall is the way they said they're just as keen to keep old amps on the road as they are to sell you a new one.

[@robertcalkjr.8325]

Thanks Brad!

[@Speedo94]

Hey man I have a question I have a 1977 jmp 100 way combo the 2103 one of the preamp tube sockets is microphonic I have put 3 different tubes in it no matter I put in it it’s microphonic and there is a 60 cycle hum when u turn the amp up what can I do to fix this!?? Thank you for your help man you the man

[@profpep]

The speaker impedance selector has been upgraded to the later switch design - earlier ones had a plug you removed and turned to suit the load. Give away is the marks from the old screws, and the hole will have been drilled out with a 'conecutter', or filed - the new switch is just a bit bigger. In Europe we have to change out the mains voltage selector too, and the lethal Bulgin round mains connector. Output valve holders may have been replaced, too. I only ever see those spring holders in the combo amps - those ceramic bases are superb.

[@pearsonebfd1]

I just jot a 1972 Marshall Super lead at a tag sale for $60.00. I don't think the lady new what she had. Amp is in Excellent shape and works like new.

[@jochemjonker3362]

That's a hell of a deal.

[@whatyoumakeofit6635]

Dang. So there is still good finds to be found !! What is a tag sale ? ....a yard sale ?

[@audiotechlabs4650]

It will be interesting to find out what problem is and what the customer will have you do. If it is only a backup amp, it still needs to be reliable. Any number of things can cause an amp to fail at a gig. I try to take a spare myself to a gig, although it is extra space and weight to carry around, knowing there is an amp available in a matter of minutes waiting in the wings so as not to to leave one stranded, is a load off your gigging mind! Full meal deal is needed. That service bill will be far less than replacing the amp with a similar amp, if you can find one. If the owner is a gigging stiff, he will recoup the service bill over the next few gigs and still make money gigging with this amp, because the service will last for several years. Who knows, after you get done with it, it very well may become his #1! Thanxz

[@browndog666ify]

Ohhhhr!! It was just gettin' good.... Part TWOoo! Oh maaan!

[@BuzzcutGtr]

God damn, I love your videos! Looking forward to Part 2, Brad!

[@NickP333]

Very cool amp. ‘71 was the last year of point to point wiring for Marshall. They switched to PCB’s in ‘72. Obviously the P to P wired ones are easier to work on and most likely sound better because of a more direct signal path. Brad, please check those tubes! They may still be fine. Siemens made some of the finest EL34’s and just some of the best vacuum tubes ever produced!

[@johnmaloney1681]

They switched to PCB’s in ‘73.

[@simonkormendy849]

Hey Brad, if I were you, I would have replaced all three of those switches as a matter-of-course with three brand-new ones, since if one switch is a bit intermittent, the other two will most likely go that way at some stage of their useful life.

[@johnthrelfall5]

I'm thinking just replace the power switch and the HT fuse and test drive it! Good diagnostics so far!

[@gabrieltudor6165]

Hey man, i`m just getting into tube gear repair and maintenance and now i`m trying to gather some tools. I ordered a bundle of alligator clips from aliexpress, you know the bunch.. 10 for 3$. I got them to clip them on various components in order to read plate voltage and stuff hands free. Is this a good ideea or the the small aligator leads will melt when trying to read plate voltage? Cheers !

[@RandyFricke]

A '72? A refurb is a bargain at any price. What a gem!

[@blop1738]

Hi,please what's the brand name - and type too - of those double-color (blue/white) capacitors at 12:36 ?

[@VersesRecords]

What confuses me with those output jack mods (amongst other things) is it looks like they have the red QC control paint on the solder joints, all though clearly some are not OG?

[@spondulip6354]

none of those plastic molded "modular" jacks are original....they're obviously new ABS plastic which didn't exist at "the turn of the seventies". some fuckery has been going on regarding the red paint on the joints.

[@Marshall-uy2dv]

It might cost a chunk of money to repair it but it is well worth it!! If that is one of the good ones no new amplifier compares to that tone!!

[@TheGuitologist]

This is the one everyone clones when they do "Plexis".

[@jochemjonker3362]

@ the Guitorlogist:interesting video,because i have a 1971 Marshall Super Tremelo 100.Powertransformer was replaced in mine,but the same PT in amp in your video,i have as a sparepart. This Marshall came from Focus Showequipement,Amsterdam, the Netherlands and this company was started,because of the band Focus(Jan Akkerman),so this can be Jan Akkerman's Marshall.But i have none conformation about this .

[@williamscaliarini8201]

Brad. When are you going to take on a hiwatt? Those are beautiful amps. I'm sure they're are very few around.

[@mandythomas4976]

This has nothing to do with this amp but I just finished my first warmoth partscaster. Go to RESCUE ROAD BAND and check it out. Pretty proud of it

[@marekmosiadz1127]

excellent

[@phonicwheel933]

The brownish red marking on the joints is Tintalite, which was used by electrical inspectors to show that a solder joint had passed inspection. (from UK)

[@plexidust5101]

Its all down hill from here ;-) actually Brad if you have an original cab and you fire that beast up with those Sylvanias , which I adore, You will be in love. Great Stuff.

[@strontvliegable]

My Marshall amp makes a rapid ticking noise and when turned halfway open gives looooots of feedback, please help!

[@douro20]

I've been thinking of building amps with uncommon tube compliments; one I've had my mind on is one with a 6AF11 and a 3C22 output tube driven in ultra-linear with its own power transformer. It would be convection cooled and biased conservatively at 50 watts. The 3C22 is a disc-seal triode similar to the 6550 designed for use in radar jammers. It can be used up to 60 watts plate dissipation with natural convection cooling and 125 watts with forced air cooling.

[@Peter-fi5mv]

Any guitar fans have an opinion on 1983 Celestion g12-65 speakers. Just found one in a €50 euro amp. Any good? Worth anymore than a new heritage or just an ordinary speakers. Cheers for all the good work Brad.

[@erikvaldur3334]

Oh no, what a cliffhanger! Godspeed Brad.

[@chrisf6216]

Red finger nail polish QC? Nowadays, Marshall puts QC stickers on their stuff. Doesn't mean they test, just that someone puts a sticker on. Let me explain. Once upon a time, a group of us guitarist in various bands bought five new DSL/TSL heads (when DSL/TSL were new). Out of the box, only one footswitch worked (1-5) Korg was Marshall's distributor in the USA at the time, so I called their support. I explained the situation but also suggested they escalate to Marshall informing them that someone is not testing their gear -- yet getting paid to put QC stickers on their equipment *and* at the expense (literally) of customers. Of the four replacements Korg sent, one only worked (1-4) Again, obviously no one actually tested if the footswitches worked. As before, Korg wanted me to ship (my expense) the bad footswitches back before they would send replacements. Three back, three shipped, only two worked (2-3). It is at this point I pointed out how ridiculous this was to the Korg rep I was working with. We were working musicians with brand new amps some of us couldn't play since we could not channel switch. At this point, the rep just sent three more footswitches, I didn't have to pay to return the junk anymore. Guess how many worked? I stripped out working parts of broken ones to fix one. I hoped Marshall would change their ways, but then new DSL/TSL boards don't come with stand-offs or fuses, do they? Out of the box, something you can't use. Frustrating!

[@GabyAvila09]

Good morning g I trust your advice do you know any good 8"4 ohm 15watt speakers

[@GoogleEqualsEvil]

These are the 8" speakers I always try first because they're inexpensive and usually sound very good. www.amplifiedparts.com/products/speaker-jensen-mod-8-mod8-20-20w

[@lroy730]

Hope he decides to Re-Cap. Some people will say. "My 70's Marshall has the original caps and it sounds fine !". But in reality it sounds like a Buzz Bomb !

[@sharifffahmi1977]

Hi... I'm working on a Marshall amp AVH150 valve state.. And the power amp chips blew... We don't have any amp techs here in saudi arabia... I'm a guitar luthier and trying to fix... Ordered the new power amps pcbs... And do t want to blow them again... When installed and switched on briefly I heard the trans former hum and switched it off asap....can we connect and give me pointers?

[@motorboy1966]

I don't know why, but I just find this s&#t relaxing.....can't wait for part 2

[@TheConsciousEvolutionchannel]

71, great year, the year I popped into this realm!

[@guitarhick]

brad can you cover thomas organ wah shematics ? i have found the schems to be ify where pot is concerned they show sig going into the 2nd leg which output also orig transistor 5117 pinout ecb as opposed to ebc of mpsa18. any help to clarify would be tits. thanks sheinker is god

[@snapascrew]

I know Eddies was a 68 but is this basically the same amp? Or was his a different model?

[@IRIE33]

After watching the video I noticed some points I want to share with you guys since this is also an educational video on old marshalls. Im not really familiar with the can/us superleads so I might be off by some parts in which they differ from the eu/uk models. 1. The stby is an original "arrow" switch. The polarity might also be original (with "droplet" leaver). Power is bad and also could have been replaced earlier. 2. The red inspection paint has been repainted at some points. The diodes don't look original to me, so the paint is also not original. Good find on the brighter color. 3. The last output jack is a different brand, as noticed (rean). The other ones could be stock, especially with the red wire covering between 2-3. Not sure why, but ok. 4. The output selector switch is a new, the older ones had a selector pin and had no rotary action. 5. The 82k plate resistor of V3 has been replaced and retouched with red paint. so there were some repairs done before. 6. The "plexi"-cap has been added at the cathode of V2 over the 820 res. 7. Two big capacitors are missing next to the diodes. Does not affect the sound. 8. Some of the output tube sockets have been resoldered. There should also be some red paint on the pins. Im not sure if some of them have been replaced and also if the white screen resistors are original. They could be. The solder joint should tell us. Keep up the work, just wanted to share my thoughts on that amp.

[@TheGuitologist]

Thanks for the comment. I think I agree with most of those observations. Part of the fun of working on this stuff is the forensic combing of the "evidence" left by other techs and the history of the piece.

[@eyedunno8462]

@@TheGuitologist Save those tubes for the studio, use Sovteks or JJs live you can't tell in the chaos anyhow

[@InspiretoVictory]

Damn. I have a 1970 Superlead. My friend got it from Sam Ash around '92 and gave it to me after a bunch of my gear was stolen from his house. A few years later, I finally decided to look closely in the back and discovered that the serial no. was scratched off and the entire head was painted black. Originally, it was a white tolex Marshall. There was a little unpainted tolex behind the back plate. I guess the people at Sam Ash decided to look the other way and sell a stolen amp. lol I ended up swapping that head cabinet for my friend's '72 Marshall because he wanted to strip one and I wanted a regular looking head. I also have a head cabinet made out of cherry that I need to do something with someday. But I really want to have my '70 restored to white tolex. Splawn guitars out in Denver, NC is pretty well known for that kind of thing. Just gotta put aside the cash.

[@marcelo_campitelli]

"Sometimes chassis are like criminals... They'll come easy and sometimes they come hard. So, you know, criminals was about the most PG rated thing I could think of" hahahaha that was just EPIC

[@petersouthernboy6327]

Still waiting for your first Diezel VH4 Blue Face to come in. [ Insert Penetrating Adam Jones Drop D Riff Here ]

[@dinger7608]

18-2-1971 (Day-Month-Year) is the only logical way to date

[@riffsnreviews]

yep, reverse clock, but in the US they like to have their minutes before the seconds. The Eu way is the only logical way to date!

[@TheGuitologist]

The US system is the logical system. Here's why... When you need to look up a date on a calendar, what piece of information do you need first? You need the MONTH first. So image this scenario. A boss asks his secretary to clear his schedule on July 10th. Secretary efficiently scrolls to July, then to the 10th, then efficiently clears the schedule. What happens the British way under the same scenario? The secretary probably has to ignore the day, scroll to the month, then try to recall the day and juxtapose that info back into her thought process. The US way is MORE EFFICIENT for practical tasks. This is why the US is still the world's largest economy. ;)

[@freepress8451]

@@TheGuitologist or The year is pretty distinct and could go at the start or end, so the real question is just mm/dd (USA) OR dd/mm (Europe). mm/dd is categorically better for sorting data. In spreadsheet software and many programming languages it's not terribly relevant if and only if every date is correctly formatted and the software recognizes it as a date. What happens when you import something and they're just numeric or character values though? The data set containing the following values (given in words): Jan 5th, Mar 28th, Feb 1st, Sep 15th, Feb 8th can be represented in two ways: mm/dd: 01/05, 03/28, 02/01, 09/15, 02/08 OR dd/mm: 05/01, 28/03, 01/02, 15/09, 08/02 Now, pretend you perform a sloppy import process, and the software doesn't know that they're dates. It only knows that these are character values. You want to put the dates in order so you do an alphabetic sort. Here is the mm/dd (USA system) result: 01/05 - 02/01 - 02/08 - 03/28 - 09/15 OR Jan 5th, Feb 1st, Feb 8th, Mar 28th, Sep 15th. Here is the dd/mm (Europe system) result: 01/02 - 05/01 - 08/02 - 15/09 - 28/03 OR 1st Feb, 5th Jan, 8th Feb, 15th Sep, 28th Mar The superior system is the system that allowed you to get the result you wanted with the least amount of data manipulation effort. The superior system is mm/dd. dd/mm is illogical and inefficient and pretending otherwise is silly. To claim otherwise is to claim that there are equally many situations where you might want to sort by day before sorting by month than the opposite which is just absolute nonsense.

[@stevepi1]

@@TheGuitologist Please tell me why I need information about the month first.

[@freepress8451]

@Dearly Diane God don't encourage him hahaha

[@brentholladay3113]

Mine has the rocker switches and a maser volume cut in over the jump logo. 1978 A period where they were using up all the old parts. Some are rockers and some are flip

[@katman11]

I have a 1971 model 1959 ....my Tech told me that even with volumes only at 2 or 3, as soon as the amp starts to distort, it's running at Full Tilt and is stressing the components...do you agree with this ?

[@TheGuitologist]

Yep. As far as output power, it’s running as hot as it’ll go one the output tubes start to distort.

[@katman11]

@@TheGuitologist wow Ty so much for the concurrence. I actually thought that I was NOT pushing the amp that aggressively with preamp volumes that low.... but the problem is it just sounds so great with the output tube distortion....when I crank the pre amp Vols I need to bring the master up to about 5 to get close the same sound...but it's still missing something. Guess I like output tube distortion better! And as you know either way it's effing loud! Tx God for my Badcat attenuation.

[@cheycasters]

I have a 1970 100W Super Lead that I bought in 1975 with two 4x12 Greenback 25w speakers (top & Bottom) and I STILL own this amp now. It has not been turned on since 6/86 , the original two pronged power cord was rotting badly and I didn't want to risk anything so I cut it off as not to get shocked or start a fire. It needs filter caps as I read in 87-88 a Guitar Player Magazine "AMPS" that explained my amps symptoms to a "T". it sounds as though it has a "funny out of tune lower octave" and mushy etc....Just exactly like mine started to sound and feel. I paid $500 for it when I was 17 years old.....for the whole stack. It IS Jimi at Band of Gypsies/Woodstock......Like Todd Sharp says "you can smell an old Marshall or AC 30 from a mile away. I grew in the great Mojave Desert in Eastern Kern County Ca. I put about a zillion hours in the heat on this amp and it just once ever blew a fuze.. In 1987 I bought brand new N.O.S. power tubes for it that hasn't been powered up. I still have the Whole Stack to this day and need to get it serviced soon... I sure can't take it to heaven with me ! Ben Fargen (Iv'e been playing Fargen amps the past ten years) really wants me to send it to him for "servicing" Oh my.. :0~ After watching this video, this amp is close to mine but in all the years Iv'e had this amp I have never once seen one identical to mine. Mine has the three black bats on/off, polarity/standby switches, four speaker output jacks and the inside is a different color board as I remember. It still has the Erie cans but as I remember mine are a lighter blue in color. The ONLY thing that went south was those rectangular screen resistors that are on the bottom side of the power tubes. Two of them had cracked and were replaced in about 1977. I see one of them in this video looks like it has a crack on it as well! My tag board had all women names on it and was told that they were more desirable as the women were more patient solderers than the guys were.......The amp when I got it from the owner said it had sat for about three years unplayed. Jus had to say! I have owned it for 49 years now.....crazy to think but I just new that someday it would be worth $$$$$

[@cheycasters]

I CAN'T WAIT TO SEE PART 2!!!!

[@davidmarshall385]

i saw kiss in 76 aces amp looks like this one they were loud and freaking great forward to evh plexi forward to lynch randy r forward to maiden all used ass kicking marshalls me too original jcn 800 what a beast through vintage 30s celestions im hankering for part 2

[@sarcophagist4097]

Watching your videos throughout the years, I have noticed you rarely use a tube tester (at least not on camera). Since all of the tubes seem to have a lot of wear (based on their looks), it would be interesting to have them measured through a tester and see what kind of emissions they still have

[@davidfuller581]

The problem is emission doesn't really tell you that much. Transconductance does.

[@TheGuitologist]

Honestly, my testers aren't all that sophisticated. And I don't find them all that useful anyway. They can find some shorts and low emissions, but they can't tell me about microphonics or intermittent issues and the like. I just find that I'm able to suss out most tube problems by other means. In the case of these output tubes, they have been in this amp since 1993, according to the date code. And they have bluing at the top that tells me they've been ridden hard and put away wet. I don't recommend throwing these tubes away, by any means. I think they will probably still work perfectly fine in a pinch. But in this situation, if I'm already in this thing and changing caps and other stuff anyway, why not get a new matched set and tweak the bias? In the long run, it makes sense to go ahead and do that and keep the old set of tubes as backups. Make sense?

[@sarcophagist4097]

@@TheGuitologist I absolutely agree that it would be best to replace all of the tubes, in order to perform and record with this amplifier in a reliable way. I'm just curious to see how the obviously well used tubes would fare being subjected to a tube tester.

[@sarcophagist4097]

@@davidfuller581 You are absolutely correct.

[@alanthompson3493]

@@TheGuitologist You really should get a decent tube tester. I have an old Sencore, even it has a "life test" for tubes, which tells u how much life is left in them. I would not ditch those awesome Siemens EL34's unless they had nothing left, not because they look used. IMO there are no current EL34's that sound or perform anything like them. If it ain't broke, don't fix it.

[@Skoora]

Granted a bad tube is a bad tube but love repair guys who think you need to swap out these old “worn out” tubes when those OG tubes will probably sound better than most new production tubes made today. Always get those old tubes back if someone changes them for you.

[@ralphups7782]

The play list says that, uncle Doug repaired a 1967 jmp-50 Marsha amp.😉😃

[@UncleDoug]

Thanks for the mention, Ralph. It was a good month for Marshall's :)

[@TheCrystalyne]

We do not print our dates the wrong freaking way, you Americans do :-)

[@DrWatts-bi1jv]

And YOU drive on the wrong side of the road!

[@PooNinja]

time is made up its always Now!

[@TheDogPa]

"Today is 2nd May 2019" has a nice, if utterly silly, ring to it...

[@Dragonblaster1]

No, the Americans drive on the right side of the road. But that’s the wrong side of the road.

[@GodInTheMachine]

Awesome