KA1J
Member
A question for any techs that have come across this before. Any suggestions are very much appreciated.
I hear a background noise from my amp which sounds like a crackly buzzing (not 60 Hz hum), which has frequent clicky somewhat loud bursts which are obvious in a quiet room. The audio appears perfect, no distortion in the clean channel and I have re-tubed the amp to see if that cleared it up (it did not). The clicks are never as loud as a played note. the sounds come and go, sometimes lasting a few seconds, usually about a second. They seem to build up and suddenly end. There is an underlying hum but again, it doesn't remind me of a 60 cycle hum.
I have been planning on using my LCR meter to check for capacitor/resistor issues and to lube/clean all the potentiometers with Deoxit. However, tonight I tried using headphones and used the speaker mute switch to play headphones only. Wala, there is almost perfect silence except for the sounds from the instrument. Reverb and all the contour settings are almost clean as a bell with the headphones only. Listening to the headphones for a while I can detect the tiniest bit of what I hear in the speaker, it is nowhere near as pronounced.
As these sounds are only pronounced when the speaker is engaged & I can't imagine it's the speaker, I feel it is an issue accentuated in the final circuit.
Any suggestions of something in particular I ought to check out?
Thank you.
I hear a background noise from my amp which sounds like a crackly buzzing (not 60 Hz hum), which has frequent clicky somewhat loud bursts which are obvious in a quiet room. The audio appears perfect, no distortion in the clean channel and I have re-tubed the amp to see if that cleared it up (it did not). The clicks are never as loud as a played note. the sounds come and go, sometimes lasting a few seconds, usually about a second. They seem to build up and suddenly end. There is an underlying hum but again, it doesn't remind me of a 60 cycle hum.
I have been planning on using my LCR meter to check for capacitor/resistor issues and to lube/clean all the potentiometers with Deoxit. However, tonight I tried using headphones and used the speaker mute switch to play headphones only. Wala, there is almost perfect silence except for the sounds from the instrument. Reverb and all the contour settings are almost clean as a bell with the headphones only. Listening to the headphones for a while I can detect the tiniest bit of what I hear in the speaker, it is nowhere near as pronounced.
As these sounds are only pronounced when the speaker is engaged & I can't imagine it's the speaker, I feel it is an issue accentuated in the final circuit.
Any suggestions of something in particular I ought to check out?
Thank you.