Looking for schematic or odd layout.

jac · Post by **jac** » Tue 05/01/07 12:39 pm

Hey all,

I'm looking for a Champ schematic, but I need something a little different.

I'd like to have a tube compliment of 2 - 6V6GT ; 1 - 5Y3GT; 1 - 12AX7. This is a junkyard amp.
Hoping there's something. Have no room for anything else.

Thanks in advance
Jac

tunghaichuan · Post by **tunghaichuan** » Tue 05/01/07 12:45 pm

jac wrote:Hey all,

I'm looking for a Champ schematic, but I need something a little different.

I'd like to have a tube compliment of 2 - 6V6GT ; 1 - 5Y3GT; 1 - 12AX7. This is a junkyard amp.
Hoping there's something. Have no room for anything else.

Thanks in advance
Jac

How about a Gibsonette circuit: 2 6V6s in parallel SE.

http://www.schematicheaven.com/gibsonam ... onette.pdf

or the Angela Super SE 6V6 project:

http://www.angela.com/catalog/how-to/Super.SE.6V6.html

You don't really need the second 5Y3.

tung

briane · Post by **briane** » Tue 05/01/07 12:47 pm

I would reconsider.

running PP you need a PI. That eats either 1 or 2 of the 2 available gain stages in your 12ax7. A single gain stage aint much oomph.

add a 12ax7 and you have a 5e3. thats what I would do.

Alexo · Post by **Alexo** » Tue 05/01/07 12:51 pm

You don't really need the second 5Y3.

But it is a very good idea if you are going to use a 40mfd filter cap, otherwise you'll be asking quite a bit out of a single 5Y3.

But with 2 tube rect's in an se amp, you won't get any sag at all, so you could just go for solid state rectification... unless you need the voltage drop (which you almost always do with Hammond PT's, IME) in which case you could use a 5U4, which will handle a 40mfd cap.

jac · Post by **jac** » Tue 05/01/07 12:56 pm

No, No. I stated 2 -6V6's! Not 2 - 5Y3GT's.
Thanks

jac · Post by **jac** » Tue 05/01/07 12:59 pm

This is an RCA PT that was/is running 2 -6V6'S. I would think that running a single will be to much voltage. Why I'd like to keep it the same.

If it's okay for a single, then that's fine. Trying to get as much oomph as I can get

ontariomaximus · Post by **ontariomaximus** » Tue 05/01/07 1:10 pm

Lose the 5Y3 - go SS rectification. Build 5E5 with a 6SL7 as PI or input tube in place of the 5Y3, or a 6V6 Plexi again with a 6SL7 as the PI.

Alexo · Post by **Alexo** » Tue 05/01/07 1:15 pm

a 6V6 Plexi again with a 6SL7 as the PI.

Me likey!

Although I would do it the other way around - 12AX7 for the pi just to get that extra gain driving the power tubes a little harder, with a parallel 6SL7 preamp...

jac · Post by **jac** » Tue 05/01/07 2:39 pm

thanks Tung for the Gibsonette, but is there a cleaner copy? I can't read that one.

I like the other ideas too. A plexi would be nice.
Are their any schematics for either ontariomaximus and/or Alexo's idea's/
More choices means more fun

Thanks

p.s. I do have some 6SL7's here, so that's not a problem

jac · Post by **jac** » Tue 05/01/07 2:45 pm

Umm... a 5E5 has 6 tubes and the power tubes are 6L6's. I need the 6V6's
Thanks

s2 · Post by s2 » Tue 05/01/07 3:13 pm

The Angela Super SE uses a single 12AX7 with two 6V6s in parallel. It will work with a single 5Y3. Just use no more than 22uF for the 1st filter cap and you'll be fine.

jac · Post by **jac** » Tue 05/01/07 3:19 pm

Thanks S2, I'll go look now.

jac · Post by **jac** » Tue 05/01/07 3:44 pm

This schematic looks good (Thanks again S2), I'm going to use it.
Question though, (and boy it would be nice if it was bigger) The schem is looking for a 40uf/500 a 16uf/450v and another 16uf/450. So your saying to drop the 40uf to 20uf? Hmm... all I have is a 8uf, 10uf or a 22uf.

edit: and thanks Tung, you mentioned it at the start.

s2 · Post by s2 » Tue 05/01/07 4:27 pm

I built that amp a long time ago and used the 6SN7 option instead of the 12AX7. Anyway, I used 22uF 450V caps for everything and it was perfectly fine.

jac · Post by **jac** » Tue 05/01/07 5:42 pm

Okay so I place 3 - 22uf / 450's for the amp and use a 6SN7?.
Thanks.

By the way, how does it sound?

Here's a couple shots of the amp. The chassis wouldn't buff out, so I decided to paint her. Used automotive paint (of course, heat), very cool color turned out. Circuitry isn't in yet but I had to see what she'll look like when done. Should be able to complete tonight.

http://jpritchard.photosite.com/champ6v6/
Thanks,
Jac

s2 · Post by s2 » Tue 05/01/07 5:46 pm

Yes. Use three 22uF 450V filter caps instead of what is shown and use a single 5Y3 rectifier instead of 2 in parallel.

You can use either preamp tube. I just wanted to experiment with the octal, so I did. It sounded really cool (fat!), but it has a gain structure similar to a 12AU7, so it is a lot cleaner than with a 12AX7.

Also, 6SN7s tend to be noisy and microphonic unless you can find a good RCA red base or the like.

hartwell · Post by **hartwell** » Tue 05/01/07 6:39 pm

Hey S2,

I know you mentioned you built the Super SE 6V6 amp years ago (and this might be a long shot) but I don't suppose you have a gut shot or layout lying around? I've tried to draw up a layout myself but am getting hung up on a couple of things.

Thanks,
Sean

jac · Post by **jac** » Tue 05/01/07 7:02 pm

The 6SN7's I have are RCA and very good, so I think I'll go the same way as you. Does any of the resister values have to be changed in conjunction with the tubes. Changing to 1 rectifier and changing to a 6SN7?
thanks in advance.
Having fun here, that's the name of the game.

Jac

jac · Post by **jac** » Tue 05/01/07 8:45 pm

S2 are you still out there?
I am going to finish this tonight. Just wondering about the resisters. I'll variac it up, but still don't want to take a chance.
Thanks, jac

jac · Post by **jac** » Tue 05/01/07 9:40 pm

Just noticed the choke a 5H /125mA. S2 did you use one in your build?
Thanks

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Looking for schematic or odd layout.

Looking for schematic or odd layout.

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