At end of build, no sound

[neikeel]

Yes, it probably is the input jack area (I suspect two issues - (1) is lack of the lo inputs working and (2) the farty sound - of course they could be the same problem!)

Post a couple of clear pics of your pot wiring and the inputs from above to show where the wires go. Use the direct link method (copy and paste and use the Img code and the pics will appear full size in the thread, not just link.

You may have a poor earth on the inputs, you can either run a wire to the bus rail between the volume pots or drill a dedicated earth lug next to the jacks. Although a lot of the ground wiring schemes here (SDM, Larry) do not use this method both my 67 and 68 100 watters have this and neither hums or have earth loops issues!

If you still have a problem and want to rewire the pots/inputs I like this scheme personally:

http://home.comcast.net/%7Ejbjdav26/195 ... ubbers.JPG

[griffid]

well, no dice. I re-wired the pots with the scheme above...still didn't work. I initially got the same farty fizzle, then nothing. A few seconds later, the fizz stopped and I got no sound at all through any of the inputs. Will post pics later, but I guess that may have not been the problem after all...

[Structo]

My guess is that you missed a ground connection somewhere.

The lack of white noise or hiss through the speaker tells me you have a problem early on in the stages.

Check all you preamp cathode grounds.

Check all grounds on the other tubes as well.

You could try to inject a signal into the PI input to see if the power amp works.

Just take a speaker cable out of a radio or other audio device and connect one wire to the .022uf cap that connects to Pin 2 on the PI tube (V3). Connect the other wire to chassis ground.
Don't use anything of high quality to inject this signal, I don't want to hear you ruined your big stereo receiver after you try it, a simple boom box or similar devise with a speaker output will work
Make sure the volume of the audio source is turned all the way down before trying it.

If you get noise out of the amp then the problem is before the Phase Inverter.