The Amp Garage

I have to say I'm liking the growing list of mods and such for this thing. I have bent a larger chassis with the plans of including reverb and a few extras for this amp. To that end I've built a 2-12 combo for my chassis and dropped a couple Jensen C12PS drivers into it......Wow , what a difference ...

Thanks guys . I'll check these out.

Signal seems to be getting by this volume pot when it is turned down. Swapped the pot over from the first channel and the same issue . Anyone run into this issue ?

Here is a two tubed reverb and tremolo.

http://tubeamplifierparts.com/schematic ... ematic.gif

Thanks Martin , I also found a aa1164 Princeton circuit that included a reverb and tremolo circuit. Same layout as the 5e3.

http://tubeamplifierparts.com/schematic ... ematic.gif

Has anyone added a reverb driver to the circuit ?

Someone at Weber is freaking out . Just received a new reverb driver in the mail today to replace a bad transformer. No idea what their up to . We'll see what they send next week.

Hats off to my unnamed supplier , Weber. Yes , unannounced and ten days later a brand new output transformer shows up in the mail. They didn't even ask for the bad one back , which gives me the chance to see if I can rewind the primary and get it working again. Way to go Weber.

Not sure if this video has been linked here before Kenny Wayne Shepherd solo starting at 3:06 is the Dumble Tweedle Dee Deluxe with delay added by engineer. https://www.youtube.com/watch?v=125Rs4u1J8g Pretty much how mine sounds at 1/4 volume with a LP through a 4x12 cab. Cleans up unbelievably nic...

Brand new OT no good. Sounds beautiful on the vintage one out of the twin. Thanks to all.

Well after doing a comparison with my twin reverb I believe I have a bad OT right out of the box. I am driving a good 2.4 volts in both amps into the output tube grids. The twin is loud , the Dumble is barely audible. A primary winding comparison between the two shows the twin split closely between ...

martin manning wrote:Sounds like you have isolated the problem, but around 50V on the PI is reasonable. You are forgetting that a Twin has a 12AT7 PI.

youre right.

Thanks John , first thing I verified as the relay cards I bought were laid out backwards and I had to draw a conversion schematic. I suspect something around the pi as I plugged into the power amp in with a preamp and couldn't get any real output. I don't think it's biased correctly for some reason ...

Thanks all. Gary , just what I needed. Hopefully I will get a chance to crack back into it soon.

Just standard taper pots ,off the shelf. With the gain and master at 50% this thing should be loud. I'm getting up to 6 volts of signal gain from V1a. By the time I get to V1b I'm lucky to have a volt. The pi is sending 12 volts max to the grids of my power tubes with everything dimed. I'm losing si...