Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tdvt on July 29, 2023, 03:58:49 pm

Title: Another Champ Reverb Thread...anyone build this?
Post by: tdvt on July 29, 2023, 03:58:49 pm

I have been talking with a friend about building him a small Fender-based amp (with reverb-only), as even the Blues Jr he is currently using is more than he really needs, due to mic-ing & in-ears.

I had quite a collection of various Champ reverb schematics saved & had thought to implement Tubenit's one-tube circuit in an adaptation.

But after looking at several different designs, using 2-tube reverb for the additional mixer/gain stage from the extra triode, seems to make sense for this one.

This thread from a few years back had multiple drafts (as well as many others in the original post) but the final version looked promising    THREAD LINK (https://el34world.com/Forum/index.php?topic=25922.0)

I am wondering if anyone ended up building anything from this design?

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: tubenit on July 29, 2023, 04:11:17 pm

This is reported as a proven circuit.


With respect, Tubenit 

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: tubenit on July 29, 2023, 04:14:36 pm

Some other ideas to look over also if you want to.


I have NOT personally built any of these that I am posting for you.




With respect, Tubenit

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: tdvt on July 29, 2023, 04:25:06 pm

Thanks so much!

I hadn't seen either of those.

At first glance, the first one looks much the same as the one you drew from the thread I referred to.

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: tubenit on July 29, 2023, 04:40:34 pm

Just a thought for you .....................


The HoSo56 is only about 7 watts or so and it's push/pull using 6BM8 tubes. Only a little more wattage than a Champ but the little bit extra comes in handy playing out in quiet venues. I use my "The Minimalist" amp with 6BM8 tubes at open mics and it's always worked well for me so far.


Just a thought .......... not pushing the idea at all.


With respect, Tubenit

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: tdvt on July 29, 2023, 04:50:17 pm

Thanks for the suggestion, I will see what he thinks.


I don't think I have ever played through a 6BM8 amp

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: PRR on July 29, 2023, 08:35:35 pm

.

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: DummyLoad on July 29, 2023, 11:11:55 pm

Yes.

Follow link below. I used a power pentode to drive the reverb tank.

https://www.dropbox.com/sh/xel0fta97qaflb7/AAAEtHTmHCWzh7_gPEfOiVFBa?dl=0


--Pete

Title: Re: Another Champ Reverb Thread...anyone build this?
Post by: tdvt on July 30, 2023, 08:00:56 am

Thanks everyone for the ideas to mull, greatly appreciated.

I think I have enough parts on-hand to build a basic test-sled to fool with & will start with the standard 6V6 configuration, though the KT88-version Champ Plus is pretty interesting!


Pretty sure I have an unused 20WSE OT on the shelf from another build that I later changed up....