Silverface champ

[angelodp]

There is this version of a Vibro-Champ which Henry took into D land. Same chassis I believe.

A

https://tubeamparchive.com/viewtopic.ph ... ight=champ

[paisley_tele]

Well I went and bought a silverface champ from craigslist. The ad said it was broken he wanted 150 for it but talked him down to 120 .So I thought about it and figured the circuit is pretty easy to find out the issue . So I pulled out the chassis looked over ever thing and found two problem 1 was a big easy hard to miss issue. Someone put in a 6L6 instead of a 6v6 like it calls for . Second issue was the 1 amp fuse was blown out. So I replaced that fuse with a circuit breaker style and put in a 6k6 to cause I didn't have a 6v6 and boom it turned on. No issues. Then I unhook the 8" speaker and put. A weber blue pup and silver pup to Ot and it sound great.

My only concerns are the bass was max out at 10 is there Anyway to get more bass put of it?

And can a mid pot be added to it some how?
But it turned out to be a 1972 or 1973. Couldn't be happier

[212Mavguy]

IMHO, unless you are going to change the cathode resistor to values better served for a 6L6, it's a moot point.

Concerning upgrading the PT; at typical higher(340>) Champ HT voltages about the max that can be wound on that frame size is about 115mA(stock PT is 60-70mA), which is barely adequate for two 6V6's and this of course that PT cannot be found on the shelf and will have to be custom wound.

TM

Not true!

David Allen at Allen amps sells an upgraded power tranny that is a drop in for for the silverface chassis cutout. I got mine used on fleabay. He also sells a nice upgraded output tranny as well that is much beefier than stock. Since a silverface is not considered by many to be a holy grail amp, it is no sin to mod one. In a single ended application this upgraded power tranny can run 6l6 or el34 no problem as far as capacity is concerned.

First of all, I think you misunderstood what I said. I didn't state that transformers were not available. I referenced the "higher" voltage Champ transformers. The Allen transformer is NOT the "higher" voltage transformer, it's 150mA @ only around 310V on the HT. If you want one that's "higher" in HT voltages with higher current, it will have to come off the custom shelf.

You cannot get 330-350V @150mA on the 022772 frame, I tried this with Heyboer last Fall and I have the specs that are the max that can be wound on that frame. Heyboer winds Allen transformers and my info comes directly from Heyboer.

If you want the higher voltages, here's about the max that can be wound on that frame, here the laminates are .250 thicker. If you drop the HT voltage requirement and increase the lam stack you can of course increase the HT rating and therein lies Allen's "fatstack style" 310V/150mA version.

330-0-330V @105mA
5V @ 3A
6.3V @ 2A

TM

@TM

Yes, I misunderstood your post. Thank you for your frank, cordial, and factual corrections. Some members would have been more than slightly rude in their reply. You took the high road, it's much appreciated.

Peace.

Mav

[ToneMerc]

Not true!

David Allen at Allen amps sells an upgraded power tranny that is a drop in for for the silverface chassis cutout. I got mine used on fleabay. He also sells a nice upgraded output tranny as well that is much beefier than stock. Since a silverface is not considered by many to be a holy grail amp, it is no sin to mod one. In a single ended application this upgraded power tranny can run 6l6 or el34 no problem as far as capacity is concerned.

First of all, I think you misunderstood what I said. I didn't state that transformers were not available. I referenced the "higher" voltage Champ transformers. The Allen transformer is NOT the "higher" voltage transformer, it's 150mA @ only around 310V on the HT. If you want one that's "higher" in HT voltages with higher current, it will have to come off the custom shelf.

You cannot get 330-350V @150mA on the 022772 frame, I tried this with Heyboer last Fall and I have the specs that are the max that can be wound on that frame. Heyboer winds Allen transformers and my info comes directly from Heyboer.

If you want the higher voltages, here's about the max that can be wound on that frame, here the laminates are .250 thicker. If you drop the HT voltage requirement and increase the lam stack you can of course increase the HT rating and therein lies Allen's "fatstack style" 310V/150mA version.

330-0-330V @105mA
5V @ 3A
6.3V @ 2A

TM

@TM

Yes, I misunderstood your post. Thank you for your frank, cordial, and factual corrections. Some members would have been more than slightly rude in their reply. You took the high road, it's much appreciated.

Peace.

Mav

My friend, you're cool me.