Static in bass frequencies

[Rifflicks]

Hello....I just replaced the transformers, all the tubes, and capacitors in a shabby old 1968 Princeton Reverb....it sounds great for the most part ....just 2 problems.....there is a buzz (static) in the bass frequencies especially at higher volumes, and, the more the bass the more pronounced the static.
The other problem is in the tremolo....with all the knobs zeroed out (minimal settings) if I turn the Intensity knob above 5 it starts putting out a loud, high frequency pulsating squeal.
Can anyone give me a clue where to start looking???

[Milkmansound]

did you replace the transformers with a set that has higher voltages?

the "farting out" bass sound is pretty standard for an old Princeton - search for posts about how to properly tune and set up a cathodyne phase inverter

you definitely have some parasitic oscillations and distortions happening - my guess is because the amp is probably running at a higher voltage than it used to have but I could be wrong about that. Might just be lead dress

[xtian]

OP's static issue sounds to me like an intermittent ground being rattled by the vibrations. Does the problem get worse with more volume, less bad with lower volume? Try plugging in an external cab to troubleshoot this issue.

[Milkmansound]

another common thing for a Princeton is a bad reverb transformer causing static like sound - you can bypass the reverb circuit and see if it goes away

[Rifflicks]

Hello....this is great thanks for the quick responses.....the static does increase with the volume....I used ClassicTone transformers for Princeton Reverbs, so they should put out the same voltages right??? ...I will try an external speaker...

[Rifflicks]

Hello .....Thanksagain ...I tried an extension speaker and it eliminated almost all of the static....so I am going to re-solder all of the grounding points.
While I have the chassis out again is there any obvious things to look at for the Tremolo problem???

[xtian]

For the static issue, it can be very tricky to find a cracked ground, such as where ground wires are soldered to the chassis (that's where I found my hairline crack). It was tough because the static would not happen with the chassis removed from the cabinet.

Best method was to remove chassis and set it on top of the cabinet, inverted, so the vibration would still rattle the bad connection, but the circuit was exposed for chopsticking. Next, I hooked my sine generator into the input, and dialed up just the right volume and frequency to make the issue appear. Then it was an easy matter to see where the trouble was by applying pressure with the chopstick.

Best luck!

[Rifflicks]

Xtian ....I'm willing to bet the problem is on the ground side of the joints where I soldered in the new caps because it didn't have this problem before I started to fix things.

[Milkmansound]

oh you put in a new can cap?

soldering to a Fender chassis is an art - might want to triple check that one

[TUBEDUDE]

I use a Weller 300 watt gun for ground connections, pot cases, etc. The work heats fast and thoroughly, eliminating cold joints.

Is it the original speaker?

[Rifflicks]

I think my Hakko soldering Iron gets hot enough....

[Rifflicks]

1 down 1 to go....I re-soldered all of the joints to ground and touched up a couple of others that weren't very pretty and it is static free in the Bass frequencies....I'm still at a total loss on the Tremolo squeal.

[Rifflicks]

I found the other problem when I put the wires I moved to install new caps back in their original positions....no more oscillation....now it's quiet and sounds phenominal.
I want to thank the people that helped me