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I received a comment form people who reportedly well-familiar with using the high-frequency high gain tubes. They suggested me that the resistor between screen and grid (R23) might be eliminated and that would bring some benefits. It very much might be correct, as the location of this resistor (used to prevent high frequency parasitic oscillations) is quite critical. The report was the 6E6P-DR (long life, better quality, extended durability, better constriction) could handle operation with shorted screen and grid.

I personally did not experimented with them without the R23 resistor. Those Milq’s drivers tubes….some of them more wiling to oscillate some less. I never used then without ferrite bids, without R23 and without the greed stoppers. I did come across of quite few occasions when the 6E6P/6E5P were too much “live” and no mater what I do to them, including the shock absorbing tube sockets, helped them.

Still, the Milq’s driver stage is not the fist stage of a phonocorrector and perhaps it is possible to operate it without the R23 resistor (I use currently the Vishay R102 as R23). If anyone has any experience dealing with triode-strapped penthods/tetroids without the R23 resistor then please let me know about your findings.

Rgs,
Romy the Cat

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