Some simple troubleshooting is in order. No need to go to a store or buy new stuff. Although buying new stuff is always fun!
Swap interconnects left to right between the preamp and power amp. Does the problem move?
If yes it is the preamp or something connected to it. If no it is the power amp.
Disconnect everything from the preamp and turn the volume all the way down, but leave the preamp connected to the power amp. Is the noise still there? If yes it is the preamp. If no, it is something connected to the preamp. Reconnect each item until you find the offending one.
If yes, buy a replacement set of tubes or better yet swap unused tubes (for example from the MM or MC phono section, whichever you are not using) into the noisy channel and see if the problem goes away. If yes, it is a tube. If no then get the preamp serviced.
It is most likely a tube - they get noisy and fail all the time.
Happy hunting,
Tom
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Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
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