Off and On Microphonics

[coyoteblue]

My amp, a Deluxe Reverb, was sounding a bit wierd so I checked for microphonic preamp tubes and found my V4 was loud. When I moved the tube around a bit, the microphonic qualities went back to normal and the amps sounded fine. I sprayed the tube prongs with a deoxidizer to no effect. What's the problem here...is it the socket? Why would a defective socket affect microphonics? I can see that the socket would work or not, but why would it increase microphony and then not when the tube is jiggled. I thought it was the tube that was microphonic?

A related question: does the tube in V2, primary gain, sound more microphonic in that place than elsewhere?

[Blue Strat]

Flakey tube connections can lead to any number of intermittant symptoms. When cleaning the socket, did you slide the tube in and out several times?

The socket may also need to be retensioned.

[rockon1]

The V1 (first gain stage) is usually the most susceptible to microphonic tubes.

[coyoteblue]

Mike, I read the advice on your site and moved the tube in and out six times. Though I didn't spray with de-oxidant each time...should I?

[Blue Strat]

Mike, I read the advice on your site and moved the tube in and out six times. Though I didn't spray with de-oxidant each time...should I?

One good spray should do it. Could be that the sockets need to be retensioned.

[Blue Strat]

The V1 (first gain stage) is usually the most susceptible to microphonic tubes.

In a 2 channel Fender amp like a Deluxe/Reverb, v1 is the first gain stage for the normal channel, V2 for the reverb channel.

[rockon1]

In a 2 channel Fender amp like a Deluxe/Reverb, v1 is the first gain stage for the normal channel, V2 for the reverb channel.

Ah,thanks for the clarification- the V2 would be just as susectable to microphonic tubes on the reverb channel in that amp.