Power Tube SCREAMS Like a Monkey! - Fender Twin Reverb Service

This is a later 1978 ultra-linear (UL) 135W Silverface Fender Twin Reverb that has extensive servicing and mods done before me, but customer complaining of noise and "glassiness" in the tone. We'll open it up and look at the mods done, and we'll eventually diagnose the problem down to bad output tubes, listen to one of them squeal like a tortured primate on command, then change tubes and rebias.
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[@manawarrior2010]

"Crack the son of a bitch to ten and shut the hell up about it." - You just won yourself a Subscriber, my friend.

[@TheGuitologist]

Sorry for the late reply, but thanks and welcome aboard, Gareth.

[@DigBipper188]

Personally I LOVE having that master volume there... it means you can drive the absolute hell out of the primary stage and not bring down every building within a 30 mile radius and have multiple nations filing noise complaints to do it.

[@TheGuitologist]

...and know something else...I was toying around with the pull boost on this example and was getting some really nice overdrive out of the amp. It took a while to EQ it and dial it in, but it did a half decent job of breaking up.

[@DigBipper188]

That's something a lot of Fender's amps were renowned for (and still are)... amps like the BluesBreaker, Bassman, Champ and the twin 'verb can make some super nice drive tones when you dial them in with a super hot signal!!

Bruce Gerard Is it true though, as a rule of thumb, a master volume feature is more effective in lowering the output level than the attenuators dropping the overall wattage??

[@NicholasGreen91]

I love it too. You can't practice pedal steel guitar on one of these with your highs disappearing. The Master Volume on this basically also serves as a treble bleed. Its wonderful for getting some harmonics at a lower volume. Lord forbid :) Just don't pull the volume knob outward ! lol!!

[@comicblueswithjonygitar36]

You can't use it on small gigs, i tried for years, the tone just isn't the same as my deluxe opened up, doesnt project or scream, this amp needs the master on 4-6 to sound like itself, which on a big gig, bar full of ppl, but don't think you can go tp a coffee house and put 1st stage on 10 and master on 2, it sounds terrible like that. Back in the seventies and eighties they used to do a gain boost where they essentially take the knobs for the speed and intensity and make that into Volume 2 and master and so it's like a boogie that one you can get a decent tone but it's still not with a twin sounds like a twin needs to be on 4 to 6 to really bleed and sound good

[@BarnegateBoys]

I own one of these. Bought it brand new and still have it today. I did go through speakers in the first few years. Finally put EV Force speakers in it. Now it's even heavier. I had to put bigger wheels on it. The amp still kicks butt. I never turn the master past 5 and it's still loud as hell. My favorite amp.

[@LeonidasLost480]

I lost track of you man. Really like the way you talk to us like we were in the workshop instead of Ireland

[@TheGuitologist]

Welcome back! Glad you found me again. I’m still making videos every week.

[@MatthewMcClellan]

Thank you. As the owner of a ‘79, this was very educational.

[@mushroomsamba82]

man that tele sounds great no matter what it's plugged in to

[@MrJohnnyDistortion]

You're correct. I plugged one into a Flowbee and it wss incredible.

[@achiever13]

I’m an electronics technician too. Been watching for a while now . Good job man. Enjoy your vids.

[@jopestv1063]

Another great vid, dude. I had to downsize in the late 90s from a Marshall 1959 to a combo. Got a Twin blackface reissue and never regretted it. This amp brings out the character of any type of guitar you run thru it.

[@deepwater2652]

I enjoy these videos of your working through the diagnosis of what is causing particular problems with these amps - learning a lot about what makes these babies tick (or stop ticking). Also interesting to see the "innards" of some of these classics from back in the day! Keep up the good work!

[@scottbee501]

Love tube amp videos! Thanks man. I had a Twin in 1974 but it was older than 74’ and it was clean and loud but “Balsey ”. It took pedals well.

[@Rialas]

Best amps ever. Stick a fulltone ocd in front and it blows away anything.

[@contrabandjoe7974]

I'm with you on the silver face master volume thing.. As well as a lot more along the lines of musical gear snobbery. The tone differences in some of these amps (vintage, late vintage or otherwise) is often so small (talking expensive amps and vintage) that how much is really discernible by the human ear??? Think about why we musicians have these tools? to make music!! Do any of us think that our audience while listening to us play make comments to each other such as "Oh my god, listen to that guitar players 78 silverface, that master volume is really negatively affecting his tone!" LOL

[@TheGuitologist]

:D

[@audiotechlabs4650]

ContraBand Joe You are correct, sir! The person who likes your guitar playing, says "Turn up", the person who is not impressed says, "You're too loud"! They don't know or care what amp you're using. Thankz

[@timclary1963]

nom nums

[@PhilGa]

I don't know how the whole SilverFace hate started. Was it in the 70's, when the Blackface era amps were still pretty fresh of the factory? Or in the late 90's - early 00's when people started buying these heavily modified SF, nowhere near the original state and passing the word on the internet of ''how bad they sounds'' ? The biggest mistake you can make with a Silverface Fender is to compare it to a Blackface. It is not the same amp hence the different EQ, hence the different Tone. I own a 1977 SuperReverb with Master Volume and Ultra Linear Schematic. Even if this is considered an ''inferior'' amp in the Fender legacy, I still dig it a lot an play it much more than my other Blackface. You can dial really great tone from it and the Master Volume is pretty useful for late night practice.

[@JamesMcCutcheon]

I purchased 74 for my son years ago its a great amp for gigging. Only did a little restoration and new tubes rebiased and its good now still great amp The master volume is really handy.

[@blkjckgtr3075]

Hi there at 15.55 theres a broken blue wire!Its wrapped arround white wire,Cheers!!

[@SDPickups]

I had one of those when it was new, AWESOME AMP! It also had some kind of push pull knob that I don't remember what it did. Only reason I ever got rid of it, was it weighed A TON! One time dragging it to band practice and I was done with it. Regret it now.

[@bakerXderek]

I LOVE the tone in those, your vids are addicting man !

[@jamesdavies3226]

bakerXderek the fact that I keep finding you on guitar videos makes me like your channel better.

[@coopercummings5170]

Found a 76 twin reverb in a guitar center for a good price. No one was paying attention to it and I played through it and got the whole stores attention. I walked (wheeled) out with it.

[@TheGuitologist]

Those were engineered to move air and get attention.

[@coopercummings5170]

The Guitologist they are severely underrated amps and a great deal. Nice Tele though

[@hatta1991]

I own the same AMP with really all things stock (includes the Caps) and I love it als hell. This tone, this great Sound this Amp has, is the best i've ever heared. And it stays clean until the whole building I'm playing inside is destroyed :D Loud as hell and clean to the bitter end :)

[@MichaelDonlinAwesome]

I'm not sure how you make amp repair mesmerizing, but ya do. Thanks for sharing.

[@AstronotMusic]

Started watching your videos recently and find them really interesting. I'm not that technically minded, but I still find this kind of thing fascinating. On this video, I almost pissed myself at the "looks like someone jizzed in here" part haha. Keep up the good work.

[@RandySchartiger]

cool video! just finished replacing power tubes in a twin, these amps rock when they're right. thanks for sharing.

[@vmc37]

Your channel is a great resource for aspiring students of guitology like myself! Thank you! Appreciate your humbleness to admit you’re not an expert but still have an opinion. A lot of stubborn people when it comes to gear and there ears.THANKS

[@lindseymontana945]

I admire your endless creativity, coming up with uncopyrighted (or seemingly uncopyrighted) material to demo your amps. It must be a pleasure to hear you at your gigs for those of us who value improvisation over rehashed versions of recordings.

[@TheGuitologist]

Well, I don't do gigs anymore really, but thanks for that. Yeah, I usually don't play songs in these demos. I just dork around and see what comes out. Trying to play to the equipment's strengths really.

[@StopMoColorado]

The Guitologist - I second what Lindsay said. I'm instantly turned off by gear demos that become wanking sessions/shred-fests. I want to hear the pedals/amps/guitars, etc., and it's easier on the ears when there's some space in the playing, and when one doesn't have to hear the same over-played guitar cliches over and over 😁

[@marksc1929]

...my daughter does PR work for Derek Trucks ...so I was able get his tech to re work my 68 Pro Reverb .....gosh it sounds and responds great now ....

[@graxjpg]

awesome stuff, you always get these things right.

[@thomasbailey9605]

phase inverter section modded. value changes back to "blackface" era. this helps these amps BIGTIME.

[@audiotechlabs4650]

There must be some good sounding SS/modeling amps out there. There IS a difference between tube amps and SS! Whether they a MV or not. The main thing is that signature sound they both make. Tube amps sound much more musical by nature. I have a Marshall, a Silvertone, a Pignose, a Crate, and a 1957 Deluxe, all tube amps, they all sound different but they all have the tube amp tone! Even Vox's new $200 micro amp with a mini tube preamp has some of the tube sound. Tubes + guitar = tone! Thank you for listening to my rant. Thankz

[@crazyuncleduke8012]

Great vid Brad! This one reminds me of a late 70's Silverface Twin MV that came to me many moons ago for a tube change and bias. Had the same type of cap changes and the use of snot in various places. Only difference is it had two EL 34 power tubes. All I can say it was a screaming banshee of an overdrive amp. Sounded like a cranked Marshall JCM 900 when the volumes were only at 9 o'clock. Always wondered who the mad scientist was who did those mods.

[@TheGuitologist]

Someone really hot rodded that one, by the sound of it.

[@stevecrooks2605]

The Guitologist Are you an Oliva Serie V smoker? :)

[@Donfleebie1]

I’ve still got my 72 SFTR I bought brand new. I haven’t used it in years. I really need to retune, bias, and have a new power cord added.

[@dariusliadon]

Lovely playing in the final demo Brad, sounds great!

[@TheGuitologist]

Thanks, Darius. I appreciate that, man.

[@matthewf1979]

The 60's Reverb transformer was made by Triad. In 70 or 71 changed to Schumacher (EIA606). Useless Fender amp trivia, the parts are identical.

[@samroth7634]

As for as I'm concerned it sounds beautiful pure tone! Love it!

[@skycarl]

Lotta fun following this one Brad. Gotta love it when the Tele comes out. Good stuff as usual pal.

[@TheGuitologist]

Thanks, Carl.

[@dangluck4795]

Best STR bias how-to ever!!

[@strumbum52]

This video brought back memories for me. I had a '78 Twin Reverb with orange frame JBLs back then and tried so very hard to like it. When Fender went to the 135W output and master volume the tone just wasn't there at usable volume levels. I used it on hundreds of dates, finally tried a Lab Series L5 amp, sold the Twin, and never looked back. Actually, the Twin did make a pretty good bass amp, especially with those JBLs.

[@edwhite7475]

I had the same amp...i hated it...so damn loud and ice picky clean. The master volume didnt work for me either...at all. This one had had an ungodly amount of roaches living in it from the previous owner...dis- gusting. I kept the speakers, one for a bass cabinet , lol, and the other for an old Leslie...and put some old Celestions in it...which made it sound better. I finally sold it to a pawnshop for $ 350 just to get it out of my house. My 2204 Marshalls are so much better for me.... That Twin is more suited to a pedal steel player. I took a loss on it...i think i paid $550 for it, and about a year later i bought a Kustom, late 80s era, solid state model Twin Reverb style combo, way used, for $35. 110 watts 2x12s, reverb and tremolo, and way more suited for me. I just wanted that tremolo sound.

[@cgavin1]

The size of that power transformer! Good God!

[@cgavin1]

.. and I went out and bought one last week. I can't imagine a live scenario where I would ever turn it up past 6. Ever. So I guess its makes sense running it on the lower end of the voltages. Make them big bottles last 20 years..

[@twincam825]

Thanks for posting video the fender amps i work on with balance pot for bias i put a 15 turn50k trimmer pot in place of resistor then i can adjust balance and bias.Like your videos not staged live in action keep up the good work thanks oh great guitar playing also.

[@trapperjohn8481]

That sounds like my truck starting up.

[@TheGuitologist]

hahaha...bad starter?

[@stupidjubei]

I'm not sure about headroom or power, but the harmonics after you tweaked it were great. Thanks for these videos! Just discovered them, and they're great!

[@TheGuitologist]

Thanks for watching and taking time to comment!

[@bmorr6734]

Fine playing, Sir

[@strat-xq5oy]

most of the GT valves i've seen are re-branded sovtek......and fender too, keep up with these fantastic vid's + sub'ed

[@TheGuitologist]

Yep, that's been my experience too. And funny thing is Sovteks were already pretty reliable, so buying GT is really mostly throwing your money away, in my experience.

[@thespiritof76..]

I had a silver face w/0 master once. It was a monkey too... Could run it at 9 and was quiet as mouse till you spanked it

[@thomasbailey9605]

wow.....thats double the filtering. 220uf vs. 100uf. Got that that tightened up! great amps!

[@Riffraff12571]

Nice thorough job going through everything in that amp and sniffing out the root cause of the problem. The best take away for me was that little ditty you played at the end that inspired me to sneak off to my jam room at 4 am and plug my Tele in. Great little riff man! God bless volume pedals in the EFX loop, haha!

[@TheGuitologist]

In hindsight it reminded me of some 70s soft rock, like maybe some Carpenters or something. :)

[@jessehudson7113]

Loved that tune at the end...

[@Tonetwisters]

Well. Give that tube a nanner! :-) I had my master volume removed as I did not want distortion. Two good amp techs said it was useless. So it went. I used mine to play weddings and some good old British Invasion music, with an ES-355.

[@paulmandes4810]

I have a twin with the Master Vol. I love no problems. Even dig the analog overdrive, cheezie cool!

[@jeffmclowry]

That is a nice sounding amp. Makes me want to purchase one.

[@smudgerdave1141]

Oops. When you did the second calculation, you forgot to divide by 2. The power for the 34k resistor was about 8.25W. This should have become clear to you when you settled on the 20k value - you lowered the resistance from 22k to 20k and increased the wattage from 17W to 19.6W. HTH

[@TheGuitologist]

Just saw this and yes! You are correct! Nice catch! So that original resistor was obviously there for the original UL strapped OT config, because it was WAY cold biased in this operation.

[@MarttiSuomivuori]

Had a Tele once, a vintage but we needed a washing machine when the baby came...

[@kenb.1829]

Past the time for me to subscribe, just did it. I rarely rant but this upload allowed me an opportunity. Mostly I just enjoy your handiwork.

[@TheCsabi86]

I like that 'monkey' sound, it's so badass. :D

[@garyeggleton1142]

that was a great video Brad....I learned alot

[@tubedude4859]

I added a good 1000 jigawatts pedal to mine and it sounds fantastic

[@armstronglance]

Dang! Never seen a silver face with that many replaced components. Got that right about soldering in cap with value not facing up. I have many mid 60’s fender heads, most aren’t working any more. Got a lot of work to do resurrecting them from the dead. Use to have all 60’s hi-gain RCA 6L6’s, but the wife knocked the box of them over onto a time floor. 😫 I’m thinking my 4 Dual Showman’s & Vibroluxes have 2.5 or 3amp regular fuses. I definitely power up my old amps with a variac while monitoring the current. I have opened up a blown transformer and luckily fixed it because a melted wire was visible.

[@Motleyguts]

I grew up with that amp, and later on convinced old dad to buy a second one. Both late 60s to mid70s depending on which part you looked at. Volume: 11 Guitar: 11 Master Volume: Are the parents home? Thanks for the video and trip down memory lane.

[@robertanderson5902]

Hey Bro Thanks for the wonderful Video and the sweet playing. Great amps had one and a Red Knob Twin. Both scremers

[@TheGuitologist]

I personally think those red knob Fenders are underrated tone-wise. The ones with Chorus I thought sounded really nice for clean.

[@Dbj5555555]

Love waiting for the monkey to start come crawling out

[@Mister_Brown]

i'm sure someone has pointed this out but you screwed up the math on the 33k and didn't halve it to 8.25w which explains the rather linear curve of bias wattage vs resistor value

[@lars-fenin]

love my 76 silver twin.. being a stable workhorse since 20 years !! but also have to change main tubes (hiss &noises) and some elkos (no voltage) now...

[@lencycler1]

I'd forgotten why I love solid state amps....thanks for reminding me.

[@harbselectronicslab3551]

You grew a beard between resistor changes lol

[@NicholasGreen91]

That's how damn long it takes

[@guitarocd9984]

When I was a kid the goal was to keep your amp from distorting. That seemed to have been the goal of the silver face to stay clean at loud volumes That's why Fender missed the boat. I remember when Mesa Boogie came out. Fender was late to the Distortion game. Seems they never caught up. But they kept making them crappy silverface amps till finally somebody woke up at fender LOL

[@ultimatemassive9501]

I've got a 69 Twin Reverb that I absolutely adore. It's one of my most prized posessions. It's pretty beat up, too heavy to gig with, and too loud to play at a reasonable volume at home, but I'll never part with it.

[@WaterburnerActual]

Made your own Humbucker tube!

[@Ferretsnarf]

I just came from your recent Mesa video. First thing I notice when I see inside these old amps is "Damn what a rat's nest". People talk down at PCBs, but they sure do make life so much easier. I'd take a good, well laid out PCB over this mess any day. Sometimes I think people like things just because they're old. That said, to be fair, if I wanted to mod a circuit, point to point is preferable.

[@LPCustom3]

One of the best investments I made for my shop is the Orange VT-1000 Valve Tester. Get some better 6L6's and convert that O/P tube balance into a real Bias control. When that Balance control was used, you could get a lot better quality U.S. Made tubes vs that Ruby stuff.

[@vox1966]

You need to tell people that you can only use 6l6 gc tubes in theses amps they will handle the plate voltage in these ultra linear amps

[@luthiervandros]

If you can’t find a replacement master push pull pot, you can transplant the carbon strip from a similar sized pot. And I’ve yet to work on one of these and not have the circuit board look like a creole ritual with all the melted wax all over.

[@hadleymanmusic]

I really liked the pro reverb that same age.

[@ijamsum]

The first volume is actually gain and the master volume then can set your volume ! If you only had the volume models the volume and gain is the same control which is volume ! Adding the master volume is a great idea for getting your tone buy adding gain and sustain !

[@brich2929]

wow, a new video! watching now!!

[@genekloszewski5484]

good stuff, love my fender amps!

[@DeadKoby]

It's it fun when an amp is significantly NOT stock, and there's no schematic showing the changes? Lovely. I was just lucky enough to score a Peavey Encore 65 at the Pawn shop. Posted it on my channel... Zero wrong with it other than scratchy pots and LOTS of spider webs.

[@TheGuitologist]

I'll admit I have a soft spot for old Peavey stuff. The 70s and 80s stuff was just so well made, it rarely screws up.

[@DeadKoby]

The only thing that could be said negative about that era stuff.... "I don't like the tone"... The build quality and reliability sure weren't a problem.

[@TheGuitologist]

The lead dress was a bit sloppy, but since it isn't a high gain amp, it isn't the end of the world.

[@DeadKoby]

On my signature amp.... Mr. Big... the Prototype used a dual grounding bus.. I was still fiddling with the design, so it's not super pretty inside.. Yet it's super quiet, and works fantastic. In the end, if it works well, it's OK.

[@wildbillhackett]

+Deadkoby ~ My dad almost bought a nice looking early model Vette when I was a kid. The reason he passed on it was because the guy who owned it had hot-rodded it so much with so many parts from other cars (Chrysler brakes etc.) that pop figured it would be a nightmare to work on when you don't know the make and model of the part you need to replace. Guys ought to consider that kind of thing when modifying amps.

[@brianmiller4207]

OMG!! I Love your videos I Laugh so much!!! You are Super smart and you say you're not then you start doing crazy math and I spit ice coffee all over ^_^ I did have a Fender Super Twin reverb (the first with computer parts) and it would crap out . It turned out to have a hairline crack in the motherboard..... I miss Tubes and wire ^_^

[@skgate]

Jizzed… lmao I haven’t heard that in years

[@barrychristiansen4579]

thx. Brad. Good job.Halilujah!!!

[@emlyngriffith5846]

Great video. Very interesting 👍🍷. I know very little about amps and their electronics so most of what you said went way over my head. But I do have a similar amp….except it has “Pro Reverb” on it. I bought it second hand over 25 years ago and have played it at home ever since (using my Gibson LP and G&L ASAT). I’ve always loved the sound quality and have had no problems until recently when a loud hum/buzz sounds when I release the strings of the guitar. Unfortunately there are no amp repair people anywhere near me…..and now I’m so old I can’t move the thing! I don’t even know if it’s possible to buy tubes for it any more (if that’s the problem?) and if it’s possible for a complete amateur to replace them…..

[@rillloudmother]

17:09 i'm waiting for Joni to say 'Help me, I think I'm fallin'...'

[@BD-me4nk]

18:20 Guitlogist new album "Sounds of the Jungle Soundtrack"

[@alangarcia6967]

😂

[@beatleme2]

I have a Bassman 100 i modded for guitar and replace the high voltage caps ...sounds great with old JBL's in it

[@ik04]

Broken wire! You didn't really miss that, did you?

[@mikeaustin4138]

Master volume was not added to the Silverface until 1972 or 1973. I had a 1970/1971 model w/o a master volume and I would have killed to have had a MV. I blew the speakers and replaced them with JBLs D-130s (Like Duane Allman used with Derek and the Dominos live) and I used that amp "against" Marshall stacks and it more than held its own. Unfortunately, it was very difficult to get a good overdriven tone out of the amp. I wish I had bought a Pro Reverb instead.

[@TheMrmartind40]

I have a 79/80, made in 79 but sold as an 80. Unfortunately, they are ultralinear and135 watts. I love it, but can't distort it. It's too clean. These are primarily meant for stage volume. I love it, and use pedals instead. But, after the Baldwin Exterminstor (loudest huge combo am ever made), this and the Super Twin are the loudest combo amps made. My master should be replaced, as it only worked at 5. Now I can get it as low as 2. I can live with 2-10.

[@stevensantos369]

I also have one from the mid 70s. I believe Ruby's are Russian. Also, if you didn't know, at least on mine, the master volume switch is also a push/pull type rotary potentiometer. try it out. It adds a small amount of distortion.

[@markymark2189]

you worked on that amp so long you grew a beard

[@bjbeardse]

...And the cap OCD takes over.

[@daleweber2579]

found a 76' silverface twin 700 used may snagged it up.

[@pd1jdw630]

In Europe we sometimes use 22uf cap to reduce our 50Hz hum. It lowers the ac ripple. Not sure why it's in there.

[@Nickpaflas]

Man, that is some serious iron.

[@theonemodifier]

this was very cool, thx

[@boulder89984]

Discovers previous unknown effect at 18:30

[@garyallsebrook3493]

I always sweep the frequency with a signal generator, in addition too running a guitar through it. By the way, you mentioned clipping a test lead on the primary centertap, I think you meant the secondary center tap...

[@hadleymanmusic]

My favorite is a jcm 900 but it was stolen as well as a bassman both serviced retubed and tuned zero time ready to go.

[@Halliday7895]

my 1966 twin reverb is getting quieter and fuzzy on the softer notes like if you hit a harmonic you hear grit in the quiet registers

[@green323turbo]

One problem could be the numerous wires soldered in different grounding spots to the chassis. Also grounding to the back of that matching pot could be a noise problem. Was there a wire that gounded the back of that pot to a common chassis ground ?

[@flintdavis2]

Disclaimer don’t try this at home!🧐

[@leonthompson8988]

I Love the sound of the twin. I'm 60yo I always have loved that tone but man the weight alone is killer on your back. Why doesn't fender make a 30 watt version in a short chassis. Keep the reverb possibly and lose the other effects. Keep both channels so you can mod one and add an fx loop. The infinite sustain you get reminds me of my friends modded bandmaster from the 70s. It's a magical tone. It's like Carlos boogie tone just not muddy like his. Fender should stop discriminating against older people and make a twin we can carry lol

[@lisaayers1975]

Man I have the Quad Reverb same as Twin Reverb but with 4 Utah 12 inch speakers made for the Amp..Mine weighs 138 pounds..Ouch lol...Thank God it has wheels built from Fender on the bottom..👍👍✌✌🎸🎸🎸

[@vicpnut1]

Where are you out of ? I'm late to the guitar /gear game (just starting out in mid 40's) but if I'm anywhere near you I'd definitely shoot any business ur way ....seeing the attention to detail means a lot.

[@azimovwatts6425]

"found a note under a jizzed capacitor. the note read: do not touch. amp will not work. now you know why.. there were strange voodoo markings under the grill cloth..."

[@jimkostan9932]

When I first got my 75 TWIN fender reverb, I was happy as ape shit: now 45 yrs later,, after really comparing to a real Blackfaced FENDER Twin their 2 totally different animals. The Master volume is where FENDER blew it,,, "according to guitar player magazine & now myself."..Black faces are much Sweeter tone wise but still a heavy mutha!