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Hi...Got this H and K head and after it has been on for a few hours, there is a very high pitched squeal that starts to appear....the level can be controlled by the master volume...this will happen with the chassis out of the cabinet but it will take longer.....hit the preamp board with a heat gun.....checked ok....soldered some connections to the tube sockets...still happens....but it takes a long time for this squeal to appear....has anybody had any experience in working with this particular unit??? It does seem a bit complex....Any input greatly appreciated...
Cheers,
Bernie
Cheers,
Bernie