what you call white noise could be in fact tube hissing,
a sign of of microphonicity of the tube....5814
since there is only one gain stage in that line amp,
you can try swaping the middle tubes to any of the front and rear tubes and see it that helps, you may also replace
that middle tube with another type of 12au7...
just be carefull, the sockets are tight..
wrt to the low grequency rumble, it is a sign of psu resonance, bring the amp in first week of April..
Good evening Sir Tony, ask ko lang po kung hindi na ba mawawala or mababawasan yung parang white noise when i turn on the power amp? Its not a hum, its more like a white noise. That was the first i've noticed when i first use it pero i was thinking it may go away din siguro after maburn in. The white noise like sound is constant hindi humihina or lumalakas when i the volume up or down, just constant & napansin ko ang speaker drivers are also constantly moving na parang something is sucking inside. Is that normal, will that go away after sometime? I tried removing the RCA just turn on without source or signal but its the same. Pag tahimik sa loob ng room medyo noticeable ang sound. Please advise.
Thank you,
Jay