1973 fender twin reverb help

[gla1013]

I blackfaced a1973 silverface twin reverb that I bought used.I put all new caps,resistors,OT & PT transformer,all new tube sockets and rewired with teflon coated wire however have a low pitched hum which increases in volume when I turn up the treble or mid on the vibrato channel. The same thing happens on the normal channel. I also cannot get any reverb or tremolo. Any advice would be greatly appreciated.

[Tom Phillips]

You basically built up a new amp keeping only the original eyelet board, pots and chassis.
Therefore, I think you just need to carefully check your work against the original layout and schematic and locate any mistakes that were maid in the rebuild.
Regards,
Tom

[gla1013]

So do you think its a wiring error? I checked the schematic numerous times however this is my first rebuild and I,m new to reading schematics any secrets to doing this or is there a way to measure ohms or volts to pinpoint the problem?

[Wilder Amplification]

So do you think its a wiring error? I checked the schematic numerous times however this is my first rebuild and I,m new to reading schematics any secrets to doing this or is there a way to measure ohms or volts to pinpoint the problem?

To proceed further in helping you, it would help immensely if you could take some pictures of your work so we can take a look.

[Enzo]

There is more to it than the schematic. For example it matters a lot where you ground things. In particular power supply filter caps.

[axpro]

Post a few pics... lead dress is crucial on Reverb amps... I am fighting with my princeton at the moment.

[gla1013]

Yes good point I will check all ground points. The main thing I notice now is the hum is low in pitch with all knobs turned off it increases in volume when I turn up the reverb knob. In fact the only sound I get from the reverb knob is louder hum and the vibrato doesn't work either.

[Marc]

Have you checked your grounds yet?

If your grounds are solid there is a poor connection somewhere that is not jumping out at you.

I'd start by checking every one of the grounds from the board, then trace everyone of the leads from the pots (per the Fender layout) to the board.

let us know what you find....

Marc

[gla1013]

Found some resistors that drifted and now reverb and vibrato are working hum is gone. Thanks for all the the advise from the threads.