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Old 12-21-2009, 10:41 PM
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Schematic for a 50W to 100W Valve guitar amp?

Hi All,

I know this is a bit different than the usual topic found on this forum, but I though I would ask anyway seeing as there are many a "seasoned" EE hanging around.

What I am after is a schematic for valve guitar amp that is capable of an output power somewhere in the range of 50W to 100W. It doesn't have to be the best amp in the world but something that at least has tone control.

Cheers,

Steve.

Happy Holidays!!
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Old 12-22-2009, 02:40 AM
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blackchisel97 blackchisel97 is offline
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Quote:
Originally Posted by dambit View Post
Hi All,

I know this is a bit different than the usual topic found on this forum, but I though I would ask anyway seeing as there are many a "seasoned" EE hanging around.

What I am after is a schematic for valve guitar amp that is capable of an output power somewhere in the range of 50W to 100W. It doesn't have to be the best amp in the world but something that at least has tone control.

Cheers,

Steve.

Happy Holidays!!
Hi Steve,

Try this link. There are zipped schematics of power and preamps. Hopefully you'll find what you're looking for
COOL SCHEMATICS


Vtech
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Old 12-22-2009, 03:30 AM
Mad Scientist Mad Scientist is offline
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Any particular reason you want a valve (tube) amplifier?
Obviously their are plenty of solid state amps that could be used. They are cooler running and much lighter to carry around.

I realize the tubes are suppose to give a slightly different sound, but I haven't heard the difference. Plus if it is to be a guitar amp you are probably going to want to add controlled distortion, fuzz, echo, etc.
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Old 12-22-2009, 07:15 AM
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There is simply no comparison. A valve amp puts out such a beautifully rich and warm tone that forever after, it makes using a solid state amp a bad experience.

IMO when it comes to audio quality, there is no substitute for an analogue signal.

Cheers,

Steve
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Old 12-22-2009, 09:35 AM
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Valve Guitar Amp Schematics

Hi Dambit,

I used to repair musical instruments and amplifiers. Here's some links to Marshall amp schematics. If this isn't exactly what you're looking for, go here for all the rest: Marshall Amps Info & Schematics
8100 Valvestate, 100W head
8412 Valvestate, 100W 4x12" 8Ω cabinet

Pre amp schematic, Issue 1 (Marshall, 1991).
Pre amp schematic, Issue 5 (Marshall, 1994).
Power amp schematic, Issue 1 (Marshall, 1991).
Power amp schematic, Issue 9 (Marshall, 1994).
Valvestate owner's manual (1 MB).
Photograph of an 8100 head.
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Old 12-22-2009, 02:05 PM
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Thanks Rick,

I actually own a Valvestate 8100. It's a great amp and I will be keeping it in reserve.

I have found recently though that it's just not loud enough during rehersals. I have had to run it through the rooms PA just to hear it over the bass and drums.

I've been thinking of going for something that has a real '80s feel, like a JCM 800 or similar. Real simple & huge power. I've always liked Marshall gear so if I get a brand name amp I will stick with them. As far as constructing one myself goes, I have found a company in the U.S that provided kits built to original schematics. I will look into that a bit further too. The website is below.

Ceriatone Amplification

We'll see how it goes.

Cheers,

Steve.

P.S Thanks for posting the owners manual, I lost mine ages ago.
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