Try replacing the tubes in the pre. Sounds like the place to start.
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This is a very common occurrence when tubes are on their way out. Sounds to me like your preamp tubes need to be replaced. Until the preamp is turned and there is a line level or phono signal, the power amp should be quiet. Since you just upgraded, you should contact the technician that serviced it and inform him of this situation anyway.
Sorry, should have read that it was the power amp that was upgraded. In most cases replacing tubes is just a matter of removing the preamp cover and removing the tubes from their sockets and replacing them the same way. Just check that the pins are lined up properly with the tube socket when you instsll the new tubes. You shouldn't have a problem with it. When you remove the cover, you will be better able to determine whether it will be a simple task, if not, put the cover back on and have someone do it for you. One other thing, Just make sure the preamp is turned off when you do this. :>)
for the records ...
the power lies in the pre amp: vk32
where 1 of the tubes 6922 was flashing like a light bulb / internal lightning when technician changed it.
swapped a new preamp and now all is clear .... but 1st time witnessing a 6922 tube flashing light a lightbulb turning on...
tks all for kind advice