In Reply to: RE: Tube dampers etc. posted by Lew on April 10, 2016 at 10:04:40:
Yes Lew,
One would suspect that logic would seem to dictate the tube which measures lowest for noise would be the best choice for V1 & V2.
But I have found that not all low noise measured tubes sound the best.
They can be very dry and dull.
My tester can measure the noise floor of a tube but you need to listen to it for microphonics.
I can tap on the tester and the value will fall, but I do not know what negative effects that may impart on the sound.
The MaxiPre has a pair of outputs that you can and I have, connected to the input of a pre to listen to what tapping on the tester sounds like through a given tube.
Some tubes just produce a "thump", while others howl like a banshee.
I believe that certain microphonic traits can be desirable in a tube.
What an MP1 needs vs my M60s may not be apples to apples.
When I had an MP3, I always used the lowest measured noise 7316s for the best performance of the pre.
Some of my best sounding 6SN7s in my M60s, are not the quietest measured tubes.
Edits: 04/10/16
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Follow Ups
- RE: Tube dampers etc. - MrDerrick 10:54:51 04/10/16 (7)
- RE: Tube dampers etc. - Lew 10:34:41 04/11/16 (6)
- Lew, have you given the Tung-Sol roundplates a serious evaluation? - jeffreybehr 11:40:26 04/11/16 (5)
- RE: Lew, have you given the Tung-Sol roundplates a serious evaluation? - Lew 14:36:01 04/11/16 (4)
- If you want to sell your single for, say... - jeffreybehr 15:30:29 04/11/16 (3)
- Any comment on Raytheon 6SN7WGT/VT231? - Lew 18:59:17 04/11/16 (2)
- I've never heard one. The instant I heard my first pair of TSRPs... - jeffreybehr 20:34:41 04/11/16 (1)
- RCA VT231/6SN7WGT - Lew 08:23:34 04/15/16 (0)