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OTL, Output Transformerless Amplifier User Group.

RE: Tube dampers etc.

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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