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Sam
Reply with quote  #1 

Hi All,

Recently put a Masterpiece and up until recently it has worked fine. Now however there's a periodic (about 180hz) popping sound from the right channel (of course I have tried switching out the tubes). Also, I recently purchased 100dB sensitive speakers and the background noise is very noticeable. 

None of the above occurs when listening with headphones.

Suggestions would be appreciated!

Cheers,

Sam

Tubemon
Reply with quote  #2 
Hi Sam
If you are not getting the same noise from your headphones. Did you check your amps?
Robbert
Reply with quote  #3 
Problems like that should be searched systematic.

First lets change the inputs of your power left goes to right and right goes to left.  Did the problem moved to the other channel?

NO. Problem is in your power amp. Do not know what power amp you have you did not tell yet.

YES. problem in the master piece.

Lets first look at a bad solder connection. tug all connections. Re-solder bad / dull looking ones.

Then lets take a look at the schematic. The only thing not shared between  the headphones and the RCA out put are the caps , 5.1 K resistor and the RCA connectors them self. Take a good look there.

Is the 3.3uF cap all OK? is the resistor of 5.1 K looking good, did it got over heated when soldering?

Perhaps you can rewire the system that the power amp is connected to the headphone connector.

Is the ground to the RCA good?

O yes I almost forgot the relay in the master piece is also in the signal path. Problems there?

I bypassed the relay. The only thing I needed to do now is switch on the amplifiers in sequence. switching on, first master piece and 30 second later the power amp. Switching off first the power amp and after 30 seconds the master piece.

Lets start here and see what you find

Greetz

Robbert
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