Why do my speakers "POP" when I turn off preamp?

Dawgcatching,

When C-J wrote your manuals, perhaps they were assuming that
your C-J tube preamp would be paired with a tube power amp,
and that your SS power amp would be paired with a SS preamp.

That way, your tube power amp would be powered down [ to
extend tube life ], when you powered down your tube preamp.

In the latter case, your SS power amp would remain on with
the SS preamp.

Mixing tube and solid state components can be problematical,
depending on the design - although the marriage of the two
technologies can have a positive effect - exploiting the
advantages of both.

For example, tube preamps will usually have a greater
amount of DC voltage on their outputs. That's OK with
tube power amps which are capacitively coupled. However,
many transistor power amps are "direct coupled" - no
coupling capacitors in the signal path - thus expecting a
very low DC component from the upstream SS preamp.

If the upstream preamp is tubed, and the power amp is a
"direct coupled" SS - there can be problems - which can
easily be remedied by installing coupling capacitors.

Moral to the story - you just have to be aware of the
various characteristics of the components you link together,
for proper "care and feeding" of your stereo components.

Dr. Gregory Greenman
Physist

Amplifiers amplify! Why would you want your amp to strengthen the sound of the power supply of your preamp collapsing? Next you will be telling us that you cannot pick up your lawnmover with it running and not cut off your fingers.

To Jea48, that won't do any good because the turn-off (and -on, too) transient is created by the line stage, and that's always in the circuit full volume no matter where the selector switch or volume control is set.

"Next you will be telling us that you cannot pick up your lawnmover with it running and not cut off your fingers."
Just who is 'you', Thg? There are a dozen people above you.
.