The Amp Garage

Hey guys, I have an amp I built a few years ago, the Smokin' Joe II by Weber...it worked great, never really rocked like it should though. The pilot lamp assembly took a dump, so I replaced that along with a very browned 2.2k off the first filter cap. Now I have no sound unless I turn it all the way...

I like a good CAO or a Los Blancos. Bassist friend of mine owns a tobacco shop here in Fylint maybe you've heard of it Paul's Pipe Shop. They have the world record for longest time smoking one bowl. Everytime I go there its like a step back into 1920, it really hasn't changed at all.

Did the bias pot mod and I have it dialed in at 70%. Sounds pretty good to me. I drilled two 1" holes in the chassis cover to dissipate any interior heat. That chassis all sealed up is not a great design. Customer called, this one is going home!

Smooth sailing with the new resistor installed. Just warm now. I have to tweak the bias a hair, 47k too hot, 68k too cold. Not sure if I'll just use a 56k or a 47k with a 10k pot. Then..I can play it!

I am not getting the two methods confused, rather my wording confused you. I normally use the 1 ohm resistor method or bias probe, but currently my bias probe is not working. So I used the shunt method to bias instead of the afordementioned ones. I calculated the circuit, and the voltage across the ...

Mercury Magnetics came through, transplanted the new interstage transformer and its up and running! One of the tubes was just starting to redplate, so shut it down and changed the bias tail resistor from 47K to 68K and it cooled it down quite a bit. But the problem I have now is it just doesn't soun...

It was a IN 4007 that was blown. Part of the class A circuit. Its up and running again. Easy fix.

Found a blown rectifier diode just after the standby switch. Goinf to replace both of those and we should be up and running.

Dang I just replaced with the same 15 watter. I will do that if it happpens again.

Sorry about that, it measures zero ohms (like touching my probes together). I'm sure that's it.

B52 AT100 tube amp on the bench. Works fine except blows internal fuses in class a mode. Checking the big 15w resistor in circuit measures no resistance at all. I have another resistor I ordered, anything else I should be looking for?

With just the reverb transformer hooked up it is fine. Looks like its the interstage tranny is bad. Hard to believe that thing is $65 at Mercury.

It gets hot with only the interstage transformer hooked up, reverb tranny disconnected. I'll check the pan and the reverb tranny in case that went south too. I see Mercury has both.

Just measured the reverb transformer, input has high readings but the output side reads full continuity to ground. Not sure what that means.

I have a Gibson Hawk GA-25RVT on the bench. Replaced the caps, rebuilt the bias circuit to spec, it didnt work before it came in. There was a 5k ceramic resistor that fell off the board. I replaced that exactly where it goes according to the schematic. When I powered it up that resistor got very hot...