PSA 200C buzzing noise


#1

PSA 200C Amp. left it on for a few hours and sometime the Buzzing noise from the center of the amp get very loud like the electricity noise from the street, high current run from the electrical pole at early morning. But the amp still works fine, just the noise is irritate.

Is this mean, maybe the relay is dying?


#2

Sounds like transformer buzz. This can be caused by a loose item in, on or touching the transformer and can sound worse at various times of the day depending on what crud is coming in over your AC line. DC is the prime suspect. The transformer in the 200c is located at the very front. If this is primarily where the buzz is from then the transformer is the likely culprit. If you are lucky, there may be a screw loose. If you are careful, you could open the chassis and put pressure on the outside of the transformer shield with the eraser of a wooden or plastic pencil to see if the noise changes. Sometimes it is the transformer winding itself and would require replacement. If you are the least bit uncomfortable with this sort of thing then don’t do it. If it is the transformer, it does not mean that failure is around the corner, though.


#3

I will open the amp up and check all screws this weekend.

Do you know when switching the amp on, a flash of electrical spark light up, is that the relay?

would the relay make any noise to if current run through a contact that has little burned to it?


#4

Um, sparks? That sounds like an iffy contact somewhere but should not cause the buzz. Probably time to route your 200c to PSA for a check up.


#5
skydog said I will open the amp up and check all screws this weekend.

Do you know when switching the amp on, a flash of electrical spark light up, is that the relay?

would the relay make any noise to if current run through a contact that has little burned to it?


The spark on turn on is the open frame relay and that is normal. Cordesman even wrote about it in his review of many years ago. It’s normal and the amp sounds like it is operating normally.

#6

Good news.