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Old 19th January 2020, 12:23 AM
Richard Richard is offline
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Join Date: Dec 2005
Location: Notts
Posts: 5,184
Default Re: WD88XL switch off hiss

Hi Alasdair,
Firstly, could it be any pre-amp or source connected that is doing this? If any are connected turn them off first of course.
Then you could try to locate the area of the problem by removing the offending channel KT88s one at a time, fire up, wait, then power down and see if one affects the problem.
If no change, fire up with both KT88s installed and without the ECC83, see if that affects it. Then with all valves installed except the offending channel 5687. You get the idea I'm sure, the valves may be ok but one may be making a poor contact or it may indicate which part of the circuit has a fault.
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