Secrets of the Marshall JMP 2204 Master Model 50W Mk2 Lead Head - The PERFECT Marshall Amp!

In this video we'll take a look at a Marshall 2204 JMP mk2 Master Lead Head from 1977. We'll change power caps, troubleshoot a fuddled up tone stack, bias the 6550 (not EL34) output tubes, and perform some minor modifications. In the end, we'll demo the amp and find out what makes the 2204 Master Model the most pure and perfect tube guitar amp Marshall ever made.
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[@TheGuitologist]

25:43 song credit: Kevin Willett "Quasar". Kevin is an old friend of mine. We took Instrumental Music class together in high school. I co-wrote this song actually, writing the intro/outro, but those parts are cut here.

[@tristansingh1862]

A great song to solder to

[@JM-bg2ts]

Americans have the date backwards think about it logically Day/month/year smallest to greatest unit !

[@TheGuitologist]

Back in the 80s when I was in school, I don't think we yet knew exactly what quasars were. They were simply referred to as the most distant objects our telescopes could detect. Now we know they are very early stage galaxies in the process of formation with a super massive black hole at the center. Amazing things. Brightest objects we've ever detected. I've always been fascinated with them. I suggested the name for the song because it reminded me of space travel. kzbin.info/www/bejne/aYW9dqOVo5iYf8U

[@wesleyalan9179]

The Guitologist ....that red prs you played in the video reminds me of the fella that got me into, and taught me a lot, on guitar back in the early mid 90's. He passed from cancer several years ago, idk why but i just felt like stating that. Awesome playing too! Thanks for this video!

[@thirdroompro]

Thanks for the marshall vid,it was informative.

[@jupitermoongauge4055]

the "missing" components aren't missing at all. Marshall built all their amp versions, 4 input lead, master volume, bass, all on the same board in this era. Which is awesome for modding. My 1978 Superbass has been modded to Superlead specs after a short stint as a 2203 MV , all with minimum component changes.

[@larslevinberget9558]

I thought the Super-Bass was even more sought after than the Super Lead? I agree! This period of Marshalls were great, I don't think they made the PA or Tremolo (Keyboard) heads at that time, but they were great for modding!

[@Phoebedumplings]

I had 2 of these in the early 80s the best rock amps ever. Period

[@CKDz]

In 1986 I bought one just like this for $300 in the Denver Post classifieds! It was beat to death, but it sounded awesome to me. The problem was I had no idea how to treat a tube amp in those days. The output transformer blew one day because I was in idiot kid and likely had it on with the speaker load disconnected, at some point during tear downs for a gigs (I can only assume). Worse, I didn't have the money to fix it for $250 at the time. So, I ended up selling it to the Guitar Center service manager for $150 (I was completely destitute) a few months later. Today it's worth 10x what I paid. I really wish I could have kept it but I'll probably scrape together the parts and build a clone for myself fairly soon. These days I want that particular amp back way more than I need the cash, but isn't that "the story" for most of us as we grow up?!

[@tednugentlives]

I passed up a 76 for 500 bucks around 1995. I had 450 and shop booted me. Now folks, the Artist 30 is a great budget tube hybrid. You can't tell its not a JCM800. Jrc4558s in preamplifier (aka ts808) and EL34s. Those are under 5 bills. Mine was 375 bucks and light as a feather

[@hereonmars]

The year was 2000, I went to a studio to record my bands record with my 5150 and the engineer, who became a brother to me, introduced me to proper Marshall with this exact year and model of amp. I dont have one, but rather an 800. But my life was never the same.

[@coldbastard6859]

JMP Marshalls were the best amps the company ever released. Great tone on its own and a real demon of an amp when modded.

[@ZillaCabs]

They are such amazing amps, we use them for doing most of our testing, so versatile and reliable too.

[@EtherDais]

All 2204s?

[@Ryan_Poff]

I have a 2×12 combo. It is still rocking! Awesome amp.

[@Crisdapari]

I find this channel not only entertaining, but also full of tips and information. I think we should never be tired of making warnings and disclaimers about high voltage stuff.

[@Rocknrollthor_norway]

Yes, exactly the same as I was thinking !!! Thanks!!! 👍

[@AnalogOpher]

This is heaven. Unfortunately 99% of PCB amps don't come within sight of this master piece.

[@d1l4te43]

A beast of an amp. The 70s JMPs sound absolutely incredible

[@ErnieDouglas]

I still have my 1979 Marshall JMP50 2X12 combo that I bought new back then. Pretty sure it is the same circuit as this 2204. I agree with Guitoligist. The JMP's are the best sounding master volume Marshall ever. My JMP50 has over well over 2000 nights gigging on it. It still performs and sounds awesome.

[@DANTHETUBEMAN]

pat benitar band guitarist Neil Giraldo used two of them ans a delay thats it for years,, great tone.

[@nabsludwig7462]

That's my amp, only I have EL34s in it, and it's totally original. Absolutely loved your video. I had my amp serviced by a tech in Australia, who is a renowned Vintage Marshall guru. I'm glad I did. He just cleaned it up a little, changed the power chord to make it compliant, et voilà! It really is the greatest amp ever. I love it! Thanks for a great video.

[@GregGolightly]

Another great video. I appreciate how educational these are (not that it is something I have an interest in doing myself) and how you are very knowledgable and pragmatic - a healthy bit of skepticism of how many people think they can hear the difference between two components

[@baritonecult622]

We have been looking for one of these for our studio, really cool seeing you go over it. Cheers from Michigan, thanks for this timeless video

[@RickJando]

I am still gigging my 79 Marshall mk 2 master volume 2x12 valve combo great sounds and never let me down.

[@Dragonblaster1]

Paul Gibson They are tanks. I have been rocking a 4212 JCM800 2 x 12 50W Master Volume combo from new in 1983. I have never needed to carry a spare to gigs "just in case": Marsha has never, ever let me down. I recently had Marshall in Bletchley give her a complete birthday (decades of heavy metal gigging had left her in a rough state, but still working). Now she's good for another 36 years, looking good but with a few battle scars remaining on the control panel. I run either a 1998 American Standard Strat or a 2002 Les Paul Standard through her, and she rawks with either. With the amount of gain I use, I find a noise gate is essential.

[@Datanditto]

I’ll buy it!

[@richardturk7162]

Really enjoyable video.I always learn something valuable here.I had an 84 2204 and loved it.

[@MrDreamsAlot]

Amazing!!! To see the inside of this amp and get a walk threw with some one who is as clearly knowledgeable as you! Very impressive!!!

[@ianwebb8066]

I love hearing you play sweet licks on an amp after watching your fantastic work on it makes for a great day thank you

[@guitarhaus]

...I find this channel so interesting, he presents and explains all these issues excellent, this guy is so informative I watch his videos and enjoy them all....... Thanks my good-man, I appreciate your channel :)))))

[@Mark.Bermudez]

Amazing tone out of this one, and thank you for all the tech info.

[@truescotsman4103]

I have this amp that's why I'm here. 77 was a special year. Mine shipped with 6550 but I had it converted voltage is about 480 for el34s. I had an effects loop installed by a tech in the 90s. the amp is magic. for tone chasers this is the holy grail of all master volume amps. mine has magical mojo never heard any any amp that sounds like it except another great marshall or maybe a friedman.

[@stuartb3690]

There is spare tolex inside the amp on the over laps , in fact quite a lot of spare material for patches if you need it. thanks for the Sharpie tip !. I recently purchased one of these beautiful amps .it's also 1977 ! My birth year. Makes me feel old !. Thanks for the video.

[@matthewotremba9230]

black shoe polish ,,,,,,,,,,,,,,, sharpie is is not truly black and is noticable in sunlight And "Phenoseal black vinyl caulk " is best for repair

[@CKDz]

Also, I would try using a small square of stainless steel or aluminum window screen material to hold down the Tolex during repairs. You can form it to the shape of the surface. This holds the flap down and frees up your other hand to spritz on the CA catalyzer right through the screen...much faster. Wipe dry and then a bit of black shoe polish or even black touch up paint, just wipe off the excess (especially if you color the repair with sharpie, which is actually appears reddish in some light after drying).

[@philipdonovan6510]

This was really fun to watch, and I did "inadvertantly" get more out of it than entertainment! I'm about 1/2 way through a 2204 build with a number of gain mods so, its great to see something like this. Well done and hey, pretty decent tone there. Thank you!

[@casperboo5465]

Great video Brad, and great fix, nice playing as well . Cheers

[@mr.jerrygarcia3281]

I want you to know how much I enjoy your videos, they are so much fun to view. I understand that we are only looking over your shoulder and I won’t claim to have learned anything from you. I had some schooling in back in the late 60’s and have a fairly good understanding. Hey you play very well too. Thank you for sharing your time with us.

[@Magnetron33]

I have a 78 Red one that I bought new. It served me well and currently sounds great! Thank you!

[@Magnetron33]

@Mark Kidd Probably not. It currently has the perfect tone I was looking for. It really does sound like a Marshall. People used to buy various amps and say it sounds like a Marshall. I always wondered why they just didn't get one. For great rock tone unsurpassed. Hiwatts and Orange are wonderful but Marshall will always be number one for me.With that being said, my amp repair guy was retiring and I got him to work on my tube amps before he quit. He told me that my 1965 Twin Reverb is the best sounding amp he has ever worked on in 45 years of repair. Too bad I can't pick it up anymore.I have it loaded with 2 celestions and the clarity at any volume is astonishing. Keep on keepin on

[@sski]

I owned a 1978 version of this amp, but sold it back in 2005 to fund a move from the East Coast to the Upper Midwest. I kick myself every day. I miss that amp so, so much.

[@Magnetron33]

I have that in a 78 model. I bought it new. 50w red vynyl. Just out of the shop it sounds GREAT! When I picked that up, I dropped off my 65 Twin Reverb. I had it in the attic for about 15 years. I had put a pair of vintage 30s in it and then it quit working. My tube amp guy is retiring, but I got him to repair all my Tube amps.He has done it for over 40 years. When I picked up the Twin. He said it is the best sounding amp he has ever heard. Mind blowing considering he has probably worked on thousands.Now if I could only still lift it. Thanks! Love your vids.

[@DalHap]

Tearin' it up!! Nice playing & nice sounding 50W Marshall.

[@SirVicc]

Probably my favorite amp of all-time. Great ep! Want to own one someday (Canadian version with EL34s and toggle switches) , but like you've shown, most have been messed with in some way.

[@AnodyneHipsterInfluencer]

I just bought an '81 2104 combo version yesterday. It's been converted to el34's and I'm absolutely thrilled with it.

[@guydouglas6094]

I watched this video in its entirety. I was entertained, as you say but I was informed and understood a lot of what you were saying. Well done to you.

[@mp-ov9dh]

I like how you leave mistakes in, like not having it plugged in! happens to me all the time..Great content.

[@scottdunn2178]

Fun Fact; Steve Grindrod designed the two input master volume 2203/2204 in 1976. He also designed the JCM 2000 DSL50 and DSL100 in 1995 to compete with the Mesa Dual Rectifier.

[@VPB1218]

Pretty impressed by the playing at the end. Wish I were this knowledgeable about gear.

[@PaulMcCaffreyfmac]

Many happy gigs around 1979/80/81 with a #2203. I loved it.

[@garykcarpenter]

Great video.. I had the 2/12 combo of the very amp..these days I'm using the Origin 50 half stack and it's very easy to tell the difference.

[@robbybrandenburg8124]

Great video as always. Great sounding amp And darn nice playing too. Love your videos. Cheers from McKee Kentucky.

[@graxjpg]

You and that amp only have 22 years on me, sick video brad really enjoyed t as usual.

[@brittisaacrossman]

Lol, I thought you were gonna hot glue the tolex down! I think it's interesting how many folks took the time to comment about how this board is used for different amp models (which you mentioned, as you also said re the chassis). Yet some of those same folks did NOT take the time to pay attention to the clipped leads and non-factory solder flux around different components, nor did they listen to you as you described how such criteria tell you exactly that. Some people, man... LOL Thanks for another cool vid, Brad!

[@brandonsmothers8907]

I have one of these. Cranked it all the way up today! Sounds great!

[@ThePileCast]

I have a 2203 from 78, absolute monster, love it

[@wallyguardian4456]

I love your channel and pick up a lot of tips. Thank you for your posts. For rips in the tolex , I usually apply a normal wood glue and heat it up with a heat gun. The tolex will become soft and you can stretch it to match the area where it was torn. Super glue tends to burn it and sometimes the tolex become shorter and brittle. But super glue works too

[@fullwaverecked]

Ha! You make a fella glad he got up early! Great video. Always jonsin for the next one. Keep'em coming my friend!

[@robertcalkjr.8325]

You made that amp kick some ass! Nice work, Brad.

[@srtamplification]

I own a 1979 100W version of this amp The 2203. I also had a JCM 800 2203 at one time as well. Awesome amps!!!

[@cgavin1]

Fantastic video! Watched this on the big screen. Really very interesting. :) I think it sounded absolutely amazeballs too. The pick attack cluck and the way the notes tear just gorgeous. I don't hear that much these days .. !

[@TheGuitologist]

wozzlepop I was also using a Forever Pick ebony for this vid.

[@bryantcrawford214]

This amp was made exactly 5 days before I was born.how freaking cool.hey bro I watch your channel all the time and I was born in 1977 as well.love the videos buddy.thanks for what you do and I love your collection as well.cheers

[@TheGuitologist]

Thanks for watching, Bryant.

[@radtone]

I have the same Exact amp...I believe it's the first amp manufactured to have a ' Master ' and ' PreAmp ' controls..which today are standard..bought it in 1978...all original, never mod'd...the power tubes actually have the Marshal logo stenciled on them...I absolutely love this amp...it's been in storage for years...recently bought it out...someone offered me $2500 for it one time...not a chance. Great vid.

[@Eddy63]

Well , you have awoken the beast ... Good vid Brad ... Nice playing as always ...

[@jasonkirkham550]

Thanks for showing the amp. What a treat !

[@RaffaeleDanieleQuarta]

very nice amp! warm and quite bity, but not harsh. Cool playing on the ending of the video, I look your videos evrytime so, I skip to the end. Thanks, liked and subscribed. Greets from Munich

[@pcbullets8726]

This amp sounds great with the PRS, some nice playin too Brad.

[@dylanarcher827]

Amp sounds awesome - really enjoyed this clip, rant included.

[@KDewees91]

Hey Brad, try contact cement for lifted tolex. Just let it sit 5-8 mins before you press it down. It wont white out and you can roll away any residue with your finger after it dries. Griot's tire shine will bring the tolex back to new. Love your channel man. Keep up the good work!

[@ejejeff1722]

Very informative video! I'm currently de-spidering my '77, along with a '86 jcm800.

[@edwardwallace4187]

Dang it. I want one. Nice shredding man! Sounds killer.

[@SynthoidSounds]

Wow . . . 6550 power pentodes! I once had a bass amp head, with four 6550s (it might have been a Traynor) . . . these tubes ran very hot, glowed orange and plasma purple. I loved it, but eventually gave it away to a friend who helped me move, didn't really have any room for it in the new place. Also had two cabinets with 15" nameless speakers (very heavy magnets). Those were the days. If anything, you provided a fond memory of those times . . . nicely done tech video.

[@Sniperfire24]

I have a 2203, i love this model of amps.

[@aporter7336]

I had the 100w head. '77 too and also a "Carol" on the board.

[@Themanincumbent]

I have one from 1979 and have owned it from new. Last year I took it to the Marshall factory to have it serviced( I live in the uk not far from the factory). They charged me about £95/$120 and replaced all the pots and caps on the front panel and jack sockets and one small cap on the main board. The amp actually sounds better now than when it was new.

[@brade42069]

How did you arrange this? Just contacted them? Would they honor such. Thing for a non-original owner you think?

[@Themanincumbent]

@@brade42069 I believe there used to be a number on their website. But you just contact the service dept then drop your amp off . They will then give you an estimate before doing any work. It’s the best way to look after an old marshal.

[@musicmant6]

Dude.I am no tech. I fn love your vids. I have learned a ton and have laughed so hard when ulaigh at yourself. Much love bro

[@sam127001]

that sound at the end ... wow !

[@jjcollins]

Fantastic job! Sounds Amazing!

[@terencekaye9948]

Geez Brad,you could strip the paint off the walls with that! Sounds Awesome!

[@d.a.t.4699]

What a cool job you have, i really am digging watching your channel.

[@TheGuitologist]

Welcome aboard!

[@desertrain4026]

I actually had one of these and I believe I got it in 1975 possibly 76… It’s been a long time ago :-) but after this, Marshall, I never played on anything else and I currently own four marshals and I love them all. By the way, the 2204 was the best Marshall I ever owned and I’m sad that I sold it.

[@michaelcoriglianol7197]

great video enjoyed it from begening to end thank you!

[@Fixologist1]

Thanks for watching, Michael.

[@palusguitar]

Holy shit, man. Great vid! Always enjoy your work and channel! I'm inspired. In the Detroit area working on buddy's guitar and had to stop for that rip! Nicely done my man! Keep it up! Peace and Love

[@TheGuitologist]

Thanks, Mark.

[@richardlee866]

That sounds great JMP 2204 My favorite Marshall Ever sold mine 20 years ago Complete stupidity on my part.

[@sidneysnottley6414]

Rock'n the Marshall - All round great informative and entertaining vid

[@LeviBulger]

This is probably my dream amp

[@z20000z]

Thank you for this Brad. Brings back memories. I had one of these. Bought it brand new, back in the day from Guitar Center in Hollywood. We were young and my friends were blown away "Wow, he has a Marshall stack!" Anyway, it sounded amazing and loved pedals. A Tube Screamer, Dyna Comp and some delay and it was arena rock for eons! Got married and sold it because it was too big for our first house, LOL ! Thanks Again!

[@EtherDais]

I suspect my amp has a story like this behind it. My old roommate bought it in philly used before selling it to me, but it has a sticker from some LA electrical safety inspection on it.... who brought it from CA to PA? The tales these amps could tell!

[@mutanthifi]

Got married, kept it in the living room. Got divorced.......... Amp is still there ;)

[@Stashmanfpv]

Great channel! 🔥🔥🔥 I just ordered a clone of this very amp and hope it sounds this good! ✌🏼

[@johnqpublic2013]

Owner of two 78's, 50 & 100 watt. Thanx for the tour. AWESOME!

[@AnodyneHipsterInfluencer]

Thoughts on how they compare? I'm looking at a 100 watt and a 50 watt myself but can't afford both.

[@bassblom]

had the 212 combo, loved it.

[@matthewf1979]

My favorite Marshall amp! Another vintage steal! If anyone is in the market for a newer Marshall in the $1500 range, do yourself a favor and buy a JMP!

[@BradsGuitarGarage]

I've found the best thing for gluing down Tolex is Titebond, you can be generous with the glue, wipe off the excess, tape it down, then when it's dry a few hours later, a wet rag cleans the schmoo off the finished repair.

[@TheGuitologist]

Probably works too. I've always used super glue for the quicker dry time, and isn't water soluble like titebond. Real humid day in the back of the van and the titebond might start to lose its grip.

[@tonepilot]

good 'un I’ve a bottle of superglue that’s been going for several years now. I keep in a little baggie.

[@tonepilot]

good 'un I don’t doubt you, it’s just that my experience has been different. It still works fine for everything I use it for but I’m sure a fresh bottle would be better for stubborn repairs like tolex that wants to lift.

[@AndrewCalhoun]

If you only open it for very short amounts of time, and/or if you live in a dry climate (or only open it in a well-air-conditioned room), and then always keep it in a ziploc bag in the fridge, you can get a lot more than 30 days out of it. But if you're in Texas during the summer, and open it in the garage, where it's 90+ degrees with 90% humitidy, and don't close it _immediately_, don't expect more than 30 days. Like good'un said, it's the humidity in the air that kicks off the curing process.

[@jhs5150]

Super glue is great on small nicks and dries invisibly. Use a popsicle stick to hold the tear down while it hardens.

[@billdavid6315]

you just reminded me....i had a 2206 and a 2207.....i want them back now : \ GREAT VID MAN !!!

[@joebloggs1444]

Sounds just like the one I owned back then...loud and rocking!!!

[@lroy730]

You are correct about the voltage danger. I've been working on amps and O-Scopes for over 15 years and Never touched full live voltage. Have been bit by charged caps a few times. The worst guitar amp for hot caps is the Peavey Windsor and other models with the Ground Shorting Relay, that's Suppose to short the caps to ground when its shut off. But the Relay stayed open and I got about 40vdc into my right hand ring finger. So don't rely on those shorting systems.

[@trismahaffay2813]

Great tone ! great playing ! Cool man.

[@rangerdoc1029]

Curious... When you repair a vintage amp like this one, do you send all the old components back to the customer? I love how you keep the embarrassing stuff in here. It keeps it real & we get to see what the process is truly like.

[@TheGuitologist]

If they request them, I do. A lot of the time I'll bag stuff up and send back even if they don't request them.

[@stevelucero9047]

I have 2 of these (both middle 70's) in the garage (along with a 120w slantcab with greenbacks).... gotta get em rebuilt someday

[@projectno5]

weirdly, in the uk these amps used to be everywhere for £200-£300. then in the last 5 years, they shot up to £1600-£2000. love the video and love the t-shirt. warriors is one of my all time fave movies.

[@johnthrelfall5]

Yep , the amp sounds musical now , and your playing and the music is very good.

[@56WagonWheel]

Enjoyed the video, very helpful

[@samaitcheson7057]

12:36 Man you gave me the best LOL in a while :D Loved this video :)

[@BuzzcutGtr]

I love watching "this silly crap," Brad! Fascinating stuff.

[@stompboxcoverband9404]

I have a 79 JMP 100 watt Superlead that is my favorite!

[@Datanditto]

But too loud to overdrive without master volume (or power soak).

[@Yupppi]

This amp sounds lovely. Killer riffing sound. Definitely also has that Marshally top end/character when playing leads up the fretboard where you have to have some balls to play confidently for it to sound good.

[@gregg4164]

I have been hit by 1 leg of a ten thousand volt transformer and I'm still here. Thats 5000 volts AC. I knocked me across the room and hurt like hell but didnt quite kill me. Probably shaved a few years off but didnt kill me.

[@TheGuitologist]

Eh, it just woke you up real good. :D

[@halbertking2683]

Those window plug impedance selectors have blown up more Marshalls than anything else I've ever seen.Coat hangers,Low E strings and duct tape have been used to get through the gig after the plug gets lost on the way to the gig.You know who you are.

[@fredbach6039]

Brad - back in the 60's I used to use a thick clear vinyl glue in a little yellow tube. Seal-all. It had eye-hook tapered screw to seal the tube when you were finished with it. It was wonderful on black Fender amps. It would also seal small holes in car gas tanks. Being vinyl, it worked smoothly with the black plastic and unlike crazy glue it always remained soft. Just cover the repair in a bit of waxed paper and hold it down with some masking tape.

[@Howlinblind]

Sounds super, great job

[@nicholastotoro7721]

Funny. My drummer has a 2203 of the same era (even with 6550’s) and he was missing that same capacitor. We always wondered why it was such a harsh, scratchy amp. He had it serviced recently and the tech noticed that, replaced the cap and it was a totally different amp! I’m sure the rest of the work made a difference, but you know what I mean.

[@SOAMLE]

Couldn't agree more with this. Had one. Miss it dearly. Perfect amp... does NOT have to be loud.

[@therealandrecorbin4050]

Great amp, loved the jmp series

[@MrSimondaniel3]

sweet .. I have a '77 2203, for 20 years now. Its Bogner modded too ,a simple mod. still sounds like a Marshall tho. so killer. my birth year too

[@bmorr6734]

Nice playing Brad.