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Old 14th October 2006, 03:58 AM   #1
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Default Next amp build - Trainwreck - Princeton - Deluxe ???

While working on my current project, I'm thinking ahead to my next amp build. I have built several single ended projects, and its time to move into push/pull. I got an old Stromberg PA, which was fried but has a cool looking chassis. It will do great for a two octal (6v6) power stage and a two or three stage preamp. I don't have a great deal of room, so, two is preferable.

I was thinking of the following (schematic links beneath).

Princeton AA964
http://www.schematicheaven.com/fende...a964_schem.pdf

Deluxe AA763
http://www.schematicheaven.com/fende...luxe_aa763.pdf

Deluxe 5E3
http://www.schematicheaven.com/fende..._5e3_schem.pdf

Trainwreck Express
http://www.schematicheaven.com/newam...ck_express.pdf

I was leaning toward the Princeton as I could get rid of the trem circuit and turn it into a different gain stage for another channel. I would think I could run it into the tone stack, just switch between plugs.

The trainwrecks are interesting also, but there are 10 or so variations. Anyone have any opinions on which are best?

Also, any suggestions for "off brand" amps are welcome (Supro, ect). As always, any help is appreciated!
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Old 14th October 2006, 01:03 PM   #2
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I suggest trying them all. Think about the amp as a series of building blocks: output stage, phase splitter / driver, tone controls, input tube.

The Princeton is a good place to start. Then you might try cathode biasing the output stage. See how you like it. Then you might exchange the second gain stage and concertina phase splitter for the longtial pair as in the later Deluxe ...

Two 9 pin tubes and two 8 pin tubes for the output stage is plenty.

-- Dave
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Old 14th October 2006, 05:57 PM   #3
G is offline G  United States
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Default Re: Next amp build - Trainwreck - Princeton - Deluxe ???

Quote:
Originally posted by gtrbryan
While working on my current project, I'm thinking ahead to my next amp build. I have built several single ended projects, and its time to move into push/pull. I got an old Stromberg PA, which was fried but has a cool looking chassis. It will do great for a two octal (6v6) power stage and a two or three stage preamp. I don't have a great deal of room, so, two is preferable.

I was thinking of the following (schematic links beneath).

Princeton AA964
http://www.schematicheaven.com/fende...a964_schem.pdf

Deluxe AA763
http://www.schematicheaven.com/fende...luxe_aa763.pdf

Deluxe 5E3
http://www.schematicheaven.com/fende..._5e3_schem.pdf

Trainwreck Express
http://www.schematicheaven.com/newam...ck_express.pdf

I was leaning toward the Princeton as I could get rid of the trem circuit and turn it into a different gain stage for another channel. I would think I could run it into the tone stack, just switch between plugs.

The trainwrecks are interesting also, but there are 10 or so variations. Anyone have any opinions on which are best?

Also, any suggestions for "off brand" amps are welcome (Supro, ect). As always, any help is appreciated!

Have you built the P1 Extreme? I'm planning on doing so using a 6SL7 instead of 'ax7s with an active load to get the full Mu of the tubes. Using that with an Eminence "Tonker" in a 1x12 cab should make a decent little practice amp.
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Old 14th October 2006, 06:32 PM   #4
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i'd also take a look at this one, it's something me and a friend have been working on...

Click the image to open in full size.

it's out of a PDF i have of an old Acrosound catalog with a few modifications, mostly in the PSU.
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Old 14th October 2006, 08:16 PM   #5
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I haven't done the P1 Extreme. I just got done with a AX84 HO, which I have really enjoyed. Did some mods and can get a good rock sound. Its a bit of a one trick pony (as are most tube amps) but it does that sound well.
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Old 14th October 2006, 08:49 PM   #6
G is offline G  United States
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I think a amp with a nice warm clean channel and a hot channel utilizing PP el34s would be a real nice amp. I had thought about adapting this Matchless circuit into a full amplifier with a clean channel also. Maybe you will be interested in such a project.

http://thejaffes.org/rory/hotbox/hotbox.php
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Old 15th October 2006, 02:49 PM   #7
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Guitar amps.

The sound will depend more on the specific parts used than anything else - other than the bias points for the outputs.

For example, if you decide to clone a "Fender" <pick ur model>, it will probably not sound particularly like the one you are trying to emulate, unless of course you happen to pick the right parts... and since it is hard to go back in time...

Most of these "designs" are rehashes of either the basic Fender design, or sometimes the Marshall design. For example the "presence" control is commonly found in the same place you find it in these "designs" as it is in many Fender amps...

etc...

Remember that the main thing you're going for in a guitar amp is the opposite of what you are going for in a hi-fi amp. The hi-fi amp is designed to NOT distort, whereas the guitar amp is designed to intentionally distort! So, what you think is "tone" is in real terms the nature of the distortion being produced - and from where that distortion stems from.

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Old 15th October 2006, 04:12 PM   #8
Sheldon is offline Sheldon  United States
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Sorry if this is a bit off topic, but I have no experience with instrument amps and am curious. You speak specifically of guitar amps. I assume you mean an electric guitar where the amp/guitar together are the instrument. Makes perfect sense.

But what is done for other instruments such as acoustic guitar, violen, wind instruments, etc.. If they are amplified from a microphone near the instrument, I would think that intentional distortion would not be desireable. Does that mean a PA amp, which is designed to amplify without much distortion?

What about the sort of hybrid case of an acoustic guitar with a magnetic pick up. Do those also pick up the overtones contributed by the body, or do you want more of a guitar amp to add body to the sound?

If I've described some of the applications more or less correctly, then I'd assume that all the combinations are used at one time or another depending on taste. Is there a most common mode, though?

Sheldon
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Old 15th October 2006, 06:53 PM   #9
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The answer depends on the artist, and their intent.

For things like /acoustic/ instruments that you want to make louder, then that is "Sound Reinforcement", meaning clean amplification and speakers.

If the artist is using "effects", and depending on what they are, one may or may not want to introduce the added distortion(s) of a so-called "guitar amplifier".

Some artists may use both.

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Old 15th October 2006, 07:07 PM   #10
Sheldon is offline Sheldon  United States
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Thanks, kinda figured that. Didn't want to assume it without some confirmation.

Sheldon
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