Tough to give advice..need to know what type of preamp and source ? vinyl,digital? does it only occur in the right channel? If you switch tubes does it move to the left? Tubes will get noisy when they want to be changed..maybe thats it? or maybe you just need to run a ground wire from source to amp.
Pre amp noise
How can my pre amp be relatively quite one day and the next puts out a hiss, not a hum...tonight it's in the right channel
Pulled interconnects, tube etc
Thanks for ideas
Pulled interconnects, tube etc
Thanks for ideas