Thanks Wyatt for the really fast response. Can't thank the community enough..

As for the input being grounded: in the ceriatone layout, the sleeve, switch, AND the tip are all connected to ground for all four inputs. For the "G" and "D" input, the tip is connected to the sleeve through the connection between "G" and "D" and the switch. With the "E" and "C" connections, the tip is connected directly to ground. I looked at the schematics before making the post and they don't show this connection. I think it's a pretty glaring error with the layout, and isn't a simplification as you suggested. I'll email the ceriatone folks and try to get that corrected.

As for the simplifications in the layout: are there any significant connections (from the board or the tubes to ground perhaps or to the filament) that you see missing? This is my first amp build, but i'm really familiar with electronics. Maybe i'll go through the schematics you posted and look for differences and such.


My main worry was whether the problem was in the 5U4G tubes which I have no way to test and which are different looking from each other. If you feel the problem probably lies in the board (which came preassembled) or the interconnections, i'll keep looking for what the problem is.

Hi,

  My friend started building a Tweed Twin, and we've been unable to get any sound from it. We do get a buzzing noise, and the transformers do turn on (their operation is audible). We're looked at the schematics of the Tweed Twin, and do not know why the input is grounded; we've grounded one pair of inputs, and not grounded the other, in order to test if this may be the case. In either situation, no sound is produced except a low hum, which does not increase or decrease with the volume knobs being fiddled with. We also received different tubes from what the schematics call for (instead of 3 AX7 and 1 AY7 we got 1 AY7, 1 AT7, and 2 ECC83S tubes). Also, the power transformer does not have an "e" output like the schematic (and the picture) show. Anyone have any ideas what is wrong?

Also: We've tested the four gain tubes and the two 6L6GC power tubes in a Twin Reverb and they work. The only two tubes that we haven't tested are the two 5U4Gs that we received, and switching those tubes with each other does nothing. The two 5U4Gs are different looking from each other and different sizes, but they both turn on when we turn on the amp (all the tubes turn on in fact).