Troubleshooting Amp

[Amp Kat]

Well it's not going to be enough for what you are wanting. One problem is you have a mic input tranny that is looking for 150 ohms impedance and you are sending it around 17k of impedance from the guitar. The 12 AX7 input is maxed out as it's set up as a mu amp and the other side of it is used as the phase inverter. The phono input is worse as it's looking for a line level signal way above the tiny guitar pick up signal. I'm not telling you to hack it as it's probably a classic vintage amp but in all reality this amp alone is not good for guitar and needs some more preamp help to get the volume you are looking for. I'm afraid that just changing values isn't going to do what you want on this amp without major mods.

You could try taking the signal from the mic volume and route it to the phono volume and see what you get or even maybe the signal from the the phase inverter back into the phono input jack as it should be close to line level maybe.

[J M Fahey]

Ouch !!!!
A Roly Roper Mod !!!!
Sadly he passed away less than 10 days ago, in his native Australia.

As of the amplifier, the proper input to use in general is the Microphone one, specially if high impedance.

The Auxiliary input was meant for a high output turntable crystal pickup and in any case it was not expected anybody would want to overdrive the amp.

Personally I would use the amp in its original form, for a dated Lo Fi sound, wouldn't try to turn it into what it is not, specially a Fender.

Not enough gain to drive that very lossy tone stack.

You have what you have.

[Justin Thomas]

Hmmm... Maybe a REAL single 12AX7 pedal preamp in front?
I got an old Viking mic pre a few years ago... I plugged a couple 12AX7s instead of the AYs, changed the RCA jacks to quarter inch... quite a nice little dirt machine!

Justin

[SpareRibs]

You could try taking the signal from the mic volume and route it to the phono volume and see what you get or even maybe the signal from the the phase inverter back into the phono input jack as it should be close to line level maybe.

Hello,
Are you telling me to run one half of the 12AX7 into the other half and then out ? Also which tube wound be the phase inverter ?

[Amp Kat]

No I'm telling you to take the signal from after the coupling cap on either the 6au6 or the 12AX7 (b) and send it to the tip of the phono in jack.

The phase inverter is taken from the 6au6 pentode on one side to one 6V6 and the 12 AX7 (b) side for the other 6V6 tube. Test leads would work well just to see if it works.

[SpareRibs]

No I'm telling you to take the signal from after the coupling cap on either the 6au6 or the 12AX7 (b) and send it to the tip of the phono in jack.
The phase inverter is taken from the 6au6 pentode on one side to one 6V6 and the 12 AX7 (b) side for the other 6V6 tube. Test leads would work well just to see if it works.

Hello,
I used a jumper wire after the coupling cap, to the tip of the phono input jack and it works. It increased the volume quiet a bit. I am currently using a 12" 16ohm speaker
I salvaged from an organ, I also have an 8ohm 12" speaker from another organ.
I think now that if I get a better speaker that may help quiet a bit.
It will suffice for my use, as Clapton probably isn't coming to my house to jam in this lifetime.
Thank You Very Much.

[SpareRibs]

Hello,
I would like to thank all of you guys for your input in helping me solve this problem. It was a problem I created by trying to put a Fender tone stack in the amp.That just didn't seem to work out.
It is finally functioning again and I will just leave it as is.