The 10 most Classic Marshall Amp Schematics are THIS SIMILAR!
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- Опубликовано: 8 фев 2025
- 10 Marshall Amp Schematics and the 59 Bassman (5F6A) are compared.
1. 1959 Fender Bassman 5F6A
2. 1962 Marshall JTM45
3. 1970 Marshall 50W Bass Model 1986
4. 1970 Marshall 50W Lead Model 1987
5. 1970 Marshall Super Lead Model 1959
6. 1970 Marshall Super Bass Model 1992
7. 1974 Marshall Super Lead Model 1959 MkII
8. 1974 Marshall Super Bass Model 1992 MkII
9. 1976 Marshall Master Lead 50W Model 2204
10. 1977 Marshall Master Lead 50W Model 2204 MKII
11. 1977 Marshall Master Lead 100W Model 2203
Background track a mixed version of this clip: • Dr Z Amps Remedy - WAR...
Every other channel struggles with their content, to keep it fresh, to keep it interesting. Not Johan. This is prime sht every god damn time.
Keep em coming I say !
Thanks, I really appreciate that! Cheers Johan
This recent series of videos reveiwing schematics is just excellent. Ive been a fan for the last year but now you are really doing something beyond 90% of youtube guitar channels
Thanks, really good to hear that!
Wow, I didn't expect them to be this similar. Very informative video Johan!
Thanks Patrik!
This is informative this informs me I don't know crap about AMP schematics.
Hahaha! Sorry about the endless details. Cheers
No problem I will study up on this next time I will know more. Have a good rest of your day.
I truly love these schematic videos
Thanks man!
Nicely done Johan, great mix and information sharing!Thanks Brother!
Thanks my friend!
Great idea for a video. I expected that Bassman and JTM45 to be paired up, as well as the Super Lead and Super Bass, but it's clear they all definitely are different branches with the same lineage, namely the RCA manual that Leo used to design the Bassman. Maybe track that down, too!
Thanks! Yeah thats really interesting. The Origin of these amps isnt that obviousl. Cheers
The Fender amps were basically HiFi amp schematics that Fender himself "adjusted" for instrument use (the fact they pretty much all use a Feedback resistor is telling of that fact). The JTM45 was a modded Fender 5F6.
Also, fun fact: an Orange Tiny Terror is basically a modded Vox AC15 with a Master Volume after the phase inverter, and a dual-gang Gain Control. The circuit has a few value differences, but it's basically the same thing overall.
Even I'm guilty of copying and basing my amp builds on older circuits! My most recent Subminiature tube amp has a preamp that's inspired on Supros, and the tone control is based on the Marshall 18w's Normal channel tone control.
Really interesting about the Tiny Terror!
Good stuff.
I was shocked (1976?) when I realized that so many Marshalls were based on Leo's 5F6A. And then I realized Leo used circuit sections/stages which were included in the front of the RCA tube manual.
I think the cathode follower feeding the tone stack is a big part of the magic of these amps.
Most sections of tube guitar amp circuits were designed in the 30s, 40s, and 50s. There have been many variations in ch. switching, etc, but the basic audio circuits still come from 70 to 90 years ago.
Thanks, yeah that’s pretty cool :-)
Johan, thanks for the schematics, (I will save a few) but the backing music was tops, really liked that one a bunch.
Thanks Gary, its great to hear that!
@50gary - I agree about the music.
This is awesome, keep doing these videos. Would also like to see maybe a tutorial on how a tube works
Thanks, glad to hear it. Check out Uncle Doug’s videos.
ruclips.net/video/x5SSKX74DKg/видео.html
Hi, Johan! Today you are little late, but I was waiting, because without you monday is just nervous and negative day! Actually I watched it couple of times, but VERY USEFULL STUFF! This way maybe I will educate myself with the most important techics. Greatest THANKS!
I am taking that video to your playlist on my channel:-) Now I can relaxe! I was afraid, where are you today! Really! Cheers!
Zigfrid
Thanks my friend! Yeah this one took all day to complete :-) Cheers
Johan Segeborn But the result was REALLY GOOD! C.U.:-)
Wow! Very good editing for comparison! One thing that you left out of the frame (down right) of changes between the 100w and 50w plexis is that the 50w has half rectification AC to DC and that gives them a slightly different sound and feel (they say less note definition/more saturation, you can elaborate on this). Keep going, Johan! Cheers!
Thanks George! Yeah I missed to underline that for sure. Cheers Johan
great work johan
Thanks! Glad you like it!
Song is killer my friend....I loved seeing the comparisons back to back....I sometimes open up two heads at once to compare the boards and layouts.. ( Ive done this with a Hiwatt DR504 and a Hiwatt DR504OL..) very cool.
Cool, I draw the 504 (4 input early 70s) schematic on this form yesterday. Will compare it to a bunch of other classics soon. Cheers
Cool. Yes, my '74 is a 4 input "standard" DR504, ( Hylight ) and the DR504OL is 2 input, ( Biacrown ) very cool amp head, much darker, extra gain stage, supposedly to try to compete against Hiwatts biggest competitor, yes... Marshall.....the story is that Reeves had started a few OL versions in the 70's, and they continued in VERY limited numbers until Biacrown closed. I'll look forward to what you come up with.. I also just recently opened up the '71 Sound City 50 Plus I have as well, ( Dallas Arbiter ) seeing what I can relate to the Hiwatts, since they were again based on Reeves designs...great video my friend...cheers!
Definitely a video I will need to save and watch again and pause couple times to have time to really analyze the differences. I'd be very interested to know more about Fender... from the late '40s Princeton up to the '59 Bassman, to really see the whole "origin" of the birth of amps :)
Thanks Phil, I will cover thar too. The birth of amps is very much related to the early work of tube manufacturers like GEC though
Johan Segeborn awesome, I hope you will comment it for us to understand each changes and evolution steps.
Great info mate and great jamming with the Dr,Z!! \m/
Thanks Clive! Glad you like that jam! Cheers Johan
Really late today to get my Monday Johan fix. Great stuff as usual!!
;-) Thanks man, this one took all day to complete :-)
Johan, very tasty playing! :)
Thanks, It’s great to hear that!
GREAT INFO! Thanks!
Thanks man!
Im a basic laborer, who occasionally welds for work, that is about as technical as i get ,but it is interesting to see behind the curtain to help breakdown certain myths if you will about amps and what preconceived notions people have about them , oh and mostly i just like the classic tones you get from these great inventions
Thanks Gus!
Johan,
How on earth do you find the time to put these terrific things together . . . with a (presumably) full-time job? Fantastic, and thank you. The amount of time involved is not lost on this subscriber.
Thanks my friend, its actually a Swedish holiday right now that I spent with schematics! :-)
It's really cool how the basic Baseman DNA carries on through all the Marshalls. Why mess with a great thing?
Yeah, they got it right pretty early ;-)
That provokes a question for me who was the first company to do something different?
Cool
Thanks! :-)
Glad you passed this on Johan. It should be of no surprise that other families of amps also display DNA heritage unique to their history. A tweak here or a component change there and a whole new fan base for that brand/model is created.... Little wonder why some amp techs fail to see the guitarists hype/excitement as the tech often only sees the same fundamental circuit with a few parts changes here and there ...
Yeah we only see the circuit diagrams and not the underlying response from all these. Cheers
Many amp techs are convinced that solid state amps are better than tube amps, technically speaking (which actually might be true on paper)
I doubt the validity of your statement Andrei.
Very nice marshall schematic guide. I like, that all common modules are in the same place so it's easier to compare. How about jcm900 MkIII 2100? I've heard, that is pure 2203 but with "sensivity" extra clipping
Thanks! Yeah let’s include the JCM800 and JCM900 circuits in the next one. Cheers
I think you'll find there's a huge difference.
HEY JOHAN! Love your channel, and I know this might not be up your alley, but! Will we ever see a vintage marshall vs a kemper profile of that amp? And maybe profiles of your tones??
Thanks, lots of love from London, UK
What's a tune! I like it! :)
Really good to hear that, thanks!
The bright channel mixer resistor bypass cap was Marshall's addition to the 5F6A circuit, Fender had bright cap on the bright channel volume, that was the sole difference between the normal and bright channels on the Bassman...
There's no better evidence right there that Fender genuinely believed nobody would turn the volume up to 10 and bypass that cap out 😂
The mixer resistor bypass makes it so you could turn the volume to '10' and still hear a difference. That single change was what sent Marshall on the path to brighter, tighter and more distorted. Fender designed their stuff in a workshop away from the public while Jim Marshall operated a music store and got instant feedback on what people wanted and changed things according to what they needed. A far more organic and democratic process compared to the Fender factory that's for sure.
great video! do you have a link for a schematic for a 1976 JMP 50 lead MKII (non mv)?? I own one and want to check the values to see if it has been modified at all.
Excellent video. Johan when did Marshall start using the 560pf mixer bright cap on the JTM45? I have seen JTM45 schematics with the 560pf mixer bypass bright cap across the 270k mixer resistors. Was it in 1964 and after? By the way great video as always. The similarities and evolution between the Fender 5F6A and The Marshalls is always an interesting topic. To me this is where it is at when it comes to amp designs.
Thanks! That’s a good question, I actually don’t know when they went from 100 to 500 on the lead models. Cheers
Could you make a video comparing Marshall and Vox circuits? Are they this similar?
The only thing different in the whole preamp stage between the 1987 and 1959 is the normal channel's cathode cap on V1 (250uF vs 320uF). I wonder if it would make any difference at all to swap the value between them.
Cool video Johan! Tutorial how tubes work?
Thanks! Yeah I can do such a video later on. Check out Uncle Doug’s channel. He has many great videos on that subject. Cheers
Does anyone know where to get a good copy of the 2203 schematic? Most online are bad resolution, you can’t read the numbers.
Hey! How about 60’ Clapton gear( Marshall blues breaker and 59 les Paul) vs late Clapton ( Stratocaster and fender amps).
That’s a great idea for a video!
Nice blitting each set of two designs. Diff for schematics!
Thanks glad to hear it!
now whats the SENSE behind noise thak thak thak in back ground
Can you please compare a JMP MK-II 2203 and a JCM800 2203?
Absolutely! They had a slightly different Precence Circuit, higher B+ and later JCM800s had less filtering. I think there actually were some units with PPIMV between 81 and 82 as well. Cheers
Although 'based' on the 59 Bassman and not changed much over the years believe a lot of the Marshall early builds where built totally on availability of parts in the UK and almost ironically may be responsible for the classic Marshall tones!
Yeah, I think that goes for so many classic guitars and amps! ;-) That’s why they’re so hard to recreate fully. Cheers
IS a 1980 Bassman any good, compared to the 1959, or JTM-45? Some guy about 100 miles from here, had a 1980 Bassman on sale for $600..
The Bassmans are pretty different from the 59 Bassman but still good amps
OK, I'll ask ... which Mk is 'best', out of the 1959s, 1992s and 2204s ... ??!
By which, I of course mean, which do you like best ... ? :)
Cheers! Be well, K
Hi Kieren! I like the early 1970s MkI Super Lead 1959 Circuit the best. Cheers Johan
so how does the copyright works in that case, just changw 1 part and there you go not a copy
So much of these circuits comes from old tube manuals. I think it’s easier to copyright the graphic design of the amp
You can trademark names and designs, but to copyright a circuit it would need to new and unique. Every single amp manufacturer, without exception, has built upon the products of their predecessors. Ultimately the differences are mostly in EQ placement & values.
You should try test the laney la30bl Johan
Yeah those seem really interesting
Probally a really great video, but sorry totally over my head.
Wem Dominator mk series. Marshall stack in a 1x12.
So is the rumor anyways.
We can compare them! Cheers
That would be sooooo freakin awsome 😃😃