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RE: and Dynaco, Scott , etc.

The Russian 7199 "equivalent" is out of production and, as you surmised, New Sensor IS guitar amp oriented.

The EF86/ZVN0545A combo could be OK, with full pentode mode KT88/6550 "finals". I have my doubts about UL mode. As there are several satisfactory replacement driver boards for Dyna MK3s, the issue is (IMO) moot.

JMO, Dyna/Scott/Sherwood style small signal circuitry is at its limit with EL34 class tubes. I definitely prefer Mullard and Williamson style circuitry, when the 6L6 family and KT88s are the "finals".

Like the 12AX7, the EF86 is a wimp that "can't fight its way out of a wet paper bag". The capacitances of the ZVN0545A are tiny and the wimpy types drive the little FET quite easily. I'm not comfortable DC coupling something like an IRFBC20 to the wimpy types.


Eli D.


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  • RE: and Dynaco, Scott , etc. - Eli Duttman 10:03:59 04/21/15 (1)

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