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In Reply to: RE: Changing the Gain posted by TomWh on March 16, 2017 at 07:08:49
Some tubes are made with a control grid helix that varies in pitch. Remote cutoff pentodes associated with AGC are pretty common. In triodes, the 6ES8 comes to mind.
The mu varies with the amount of bias voltage applied. The association with AGC should be obvious.
These are Russian 6s3p-ev a buddy send me. I am running them a little hot around 3.2 watts but they sound very good. Will be going down on b+ and current to see what happens.
Is it linear how the bias and mu react. Also is it always in the same direction?
Good luck with the 46 amp have them in the 1st stage of my power amps.
In the case of the 6s3p-ev, the +/- 15 for mu seems to be manufacturing tolerance, as opposed to intentional variable mu.
The acceleration/impact ratings suggest aerospace and/or military service as the intended use.
The 1T4 is a fair example of a super-control/remote cutoff type.
***The acceleration/impact ratings suggest aerospace and/or military service as the intended use.***
Well, not really, those are pretty mild specs. Some military tubes are designed to handle 150g repetitive shocks and 500g single shocks, plus 20g vibration.
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