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Conference napalm::guitar

Title:GUITARnotes - Where Every Note has Emotion
Notice:Discussion of the finer stringed instruments
Moderator:KDX200::COOPER
Created:Thu Aug 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3280
Total number of notes:61432

2270.0. "Help, schematics needed......" by TENERE::MALLET (to the next whammy bar...) Fri Jul 26 1991 05:20

   Pleeeeeaaaaaaase, i need schematics for the following amps :

   -Marshall JTM45 'Bluesbreaker'
   -Marshall JCM900 (50 or 100W)
   -VOX AC 30
   -Fender Twin Reverb
   -Mesa Boogie Studio 22 w/EQ.

  If you have any of these reference/state of the art/vintage schematics please
  send me a copy/xerox  to Jean Paul Mallet/ Telecom Engineering Valbonne...
T.RTitleUserPersonal
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2270.1CAVLRY::BUCKtear down the wallsFri Jul 26 1991 11:152
    Anyone with JCM 900 scematics, I want a copy, too!!!
    
2270.2modding the Marshall mod?HAVASU::HEISERread my mips, know new vaxesFri Jul 26 1991 14:093
    RE: -1
    
    why?  so you can void the warranty? ;-)
2270.3gh HATES that expression ;^)CAVLRY::BUCKtear down the wallsFri Jul 26 1991 14:233
    RE: -1
    
    Eggs-actly.
2270.4inquiring mindless want to know...HAMER::KRONRU4REALFri Jul 26 1991 14:475
     just curious.......for all the raving about what great
    amps marshalls are;
    -WHY IN THE WORLD WOULD YOU NEED SCHEMATICS???!!!
    -Bill
    
2270.5RU4real?CAVLRY::BUCKtear down the wallsFri Jul 26 1991 15:073
    -1
    
    Eveyrthing breaks sometime, U know!
2270.6Strange But TrueRGB::ROSTIf you don't C#, you might BbFri Jul 26 1991 15:2012
    Most bizarre failure on a gig yet: the power switch wouldn't turn the
    power OFF.
    
    I'm such a lucky guy, I have *never* had an amp die on me at a gig. 
    Keeping my fingers crossed.....
    
    							Brian
    
    P.S. Whatever happened to the days when schematics came with amps?  I
    have three old tube jobs with the schematic glued to the chassis, and a
    newer amp that had the schematics printed in the manual (for
    that matter, when was the last time you got a manual with an amp?).
2270.7IM4REALRU??HAMER::KRONRU4REALFri Jul 26 1991 16:014
     re: -2 .....tsk-tsk-tsk......you mean the amp of all
    amps ultimate deluxo rig ISN'T PERFECT????? Iwould
    think for all the $ you shell out you could expect
    a little something like reliability!!!!!!!!!!!!!!!!!!
2270.8RAVEN1::JERRYWHITEHere's a quarter ...Fri Jul 26 1991 16:0712
    The only aamp I've ever known that doesn't need schematics is a ...
    
    .... uh ...
    
    .... well ...
    
    
     ... face it - NO amp is perfect !  Acoustic players have the most
    reliable means of guitar amplification, if ya really wanna get down to
    da truth ...
    
    Scary
2270.9void that warranty!HAVASU::HEISERread my mips, know new vaxesFri Jul 26 1991 16:555
>     ... face it - NO amp is perfect !  Acoustic players have the most
>    reliable means of guitar amplification, if ya really wanna get down to
>    da truth ...
    
    yeah the Crown amp in the PA system ;-)
2270.10LEDS::BURATIFender BenderFri Jul 26 1991 17:3424
    Whoa! I detect some hostility toward Marshalls here. Let me put my
    perspective in. It's worth about $.02 anyway.
    
    Maybe NEW Marshalls are built well but my old one -- which in my opinion
    is the best SOUNDING amp in the world -- was indeed unreliable. At least
    compared to a Fender. Lots of mechanical -- some electric -- problems.
    But not many amps ever compared favorably to a Fender in terms of
    mechanical and electrical integrity.

    Anyway, the fact that I had a few problems was OK. I love it and always
    have for its SOUND. Besides, the base note asked for a lot more than
    Marshall schematics. Maybe the guy's interested learning about what
    makes great SOUNDING amps great. Those are all classic units.

    BTW, Back in the old days when your choice in PA power was between Altec
    (tube), Bogen (tube), Dynaco (tube), Macintosh (tube), Harmon Kardin
    (tube) and Crown (SS), Crown was the premiere power amp. The most power.
    Solid state. Only one problem: They had a BIG reputation for going DC
    and frying speakers by the $$$hundreds$$$. So reliability is not what
    comes to my mind when you say Crown. But maybe it was all a vicious
    rumor.
    %reply-to-long-err
    gotta go.
2270.11have a good weekend yall!HAMER::KRONRU4REALFri Jul 26 1991 18:0912
     I'm not hostile I just couldn't resist pointing out 
    that a marshall is just like any other amp and not
    the super amp some folks would lead us to believe.
    I have had only two amps in fourteen years and have
    never needed any service on them at all.my first was
    an acoustic 150b w/lifetime warrantee (not needed)
    and my current set up is a P***** which some folks 
    take great pleasure in ridiculing however it always
    works and does it well. I have no bad things to say
    about marshallsjust the weenies who play them. :')
    (just kidding!)
    -Bill
2270.12I don't recall anyone raggin PV bass stuff...GOES11::G_HOUSEI wanna be sedated!Sat Jul 27 1991 20:0519
    re: Bill
    
    Hey, I also rave up the Marshalls, but I also do it for the sound.  I
    could care less about the reliability since 1) I can afford to have it
    fixed if it breaks, and 2) I rarely if ever play out anyway.  I never
    claimed they don't break (even though none of mine have, since having
    the one I bought broken fixed).
    
    You're a bass player, right?  Note that you won't find any notes I've
    written ragging on Peavey BASS or PA amps, just their guitar amps. 
    I've never heard a PV guitar amp they made that sounded good to my
    ears.  Maybe my ears are different then yours.  Whatever, it's no big
    deal to me.  Also note that I've never raved up Marshall BASS amps, I
    honestly don't recall ever having heard one...
    
    I play a Marshall guitar amp because it sounds the best to my ear.  I
    *need* something that sounds great to cover up my crappy playing...
    
    Greg
2270.13Is it Vax Notes or Desert Storm ???TENERE::MALLETto the next whammy bar...Mon Jul 29 1991 05:4521
Keep cool men, and let's go back to my first topic.
I need all these schematics to design and build my final geetar tube preamp
gathering all these marvellous sounds in the same unit....
Perhaps that's sheem utopianism but try and listen.

My idea is all tube design with :

 Three channels (switchable).
 - 1st channel : British sound (Marshall & Vox). Gain, Volume (Gain switchable
                 for master/nomaster select). Bass/Mid/Treble with tone 
                 controls AFTER last stage. (This unit needs 2x12AX7A)
 - 2nd channel : US sound (Fender). Gain, Volume. Bass/Mid/Treble with tone 
                 controls between first and second stage. (This unit needs
                 2x7025)
 - 3rd channel : US sound (Boogie). Lead, Gain, Volume. Bass/Mid/Treble +
                 switchable 5 bands EQ (256/512/1k/2k/4kHz). (This unit needs
                 4x12AX7A)

I agree that this will look like a Boeing dashboard, but......

Any comments ?