Constant noisy tubes maybe go solid state?

@aj523
Tube Depot is fine!
Google is your friend! Here ya go!

As tubes wear, some problems can come up. One of the most common symptoms is a ringing sound. This is usually due to the tube becoming microphonic. Like its name suggests, a microphonic tube is picking up sound and amplifying it.

Dual triode preamp tubes like the 12AX7 really have two separate tubes inside one glass envelope. When the plate current draw of each triode is the same (as evaluated by our VTV testers), we refer to that as having balanced triodes. These may or may not also have the same gain on each triode but are still considered balanced.

12AX7 tube is a high gain dual triode tube found in many tube amps. Because of the high gain, the 12AX7 tube is often used in the V1 position of guitar amps, which has a lot of effect on sonics. It is the tube that defines the sound of your amp in a big way.

Read up on Linear tube Audio and David Berning designs for a tube amp without noise or distortion.

Tube Depot is fine, however they don't seem to have the same level of NOS stock that they used to have

@ gochurchgo. Very easy solution. Go Here http://tubeaudiostore.com/ ,
and look up your tubes. There will be three grades. Standard, Low Noise and Super Low noise. the SLN tubes are one in ten. Each tube is individual tested and a label with the important specification is placed on the side of the box. The SLN tubes are expensive but the SLN 6922 I got were an easy 10 dB quieter than the one ARC supplied with the phonostage. I am on my second set now and they are just as quiet as the first.  Basically you now exactly what you are getting and pay for it. Roger Modjesky created this process. He passed not long ago but his business soldiers one probably in the hand of his employees who really liked him alot. Several are contributors on this site. 
Everything else, all the NOS stuff included is a crapshoot. IMHO these people with their NOS tubes and Tube rolling are insane. Perhaps it is the tube rolling that made them insane. Many give up in frustration and switch to SS if they have any money left.

By wary of any tube seller that uses the term: "NOS in white boxes". Much more common with JAN tubes that were bulk packed, this term usually means that the tube tests as NOS and comes in a white box. Not the same thing.