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5692

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Lew

In Reply to: RE: Yep.. posted by MLin on December 17, 2023 at 13:49:07

I have a few but have not used them for many years. I don't recall their being particularly microphonic. They are more robustly constructed, internally, compared to other 6SN7s, so I might have thought they would be less likely to ring. Where are you placing your preamplifier in relation to the speakers, and is the preamplifier well isolated from other sources of air borne and directly transmitted vibrations? All of that can make some tubes that are "mildly" microphonic, useable. I agree with Ralph that tube dampers don't help much, but the O-rings that I use seem to help at least somewhat. Currently running RCAs with the gray glass; I think VT231s.

Follow Ups:

RE: 5692 - MLin 21:38:01 12/18/23 (1)
Thanks Ralph and Lew. I can confirm that it's the tube that's microphonic and has nothing to do with the tube socket. It was just my wishful thinking that maybe I did not insert them firmly and tightly into the socket that contributed to the ringing noise.

The MP-1 is well isolated and has the full damping upgrade from the factory. These two KenRad tubes (one 6SN7GT, one VT231) are just badly microphonic - turning the Shallco volume pot was enough to make them ring. They do have very nice sound though so I am thinking about putting them in the V2 position of the MA-1.

Agree with the 5692 tubes being robustly constructed and not likely to ring. I actually remember reading somewhere they were made for military purposes and intended to be used in equipments situated at artillery base.
- RE: 5692 - Lew 19:02:30 12/19/23 (0)
  I've had that happen, where the clicking of the attenuator is enough to set off the tube. In the MP1,the pot is located close to the R channel linestage input gain tube, which makes for a problem in the case where the tube is microphonic to begin with. But in some cases, the tube stops ringing once you're set the gain to suit your taste.

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