russian 6aq5(6p1p)

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Hey.
I've made 6p1p(rusian 6aq5) pushpull amplifer.
But I've found something very qurious.
When switched on, plate current of 6p1p increses very slowly and finally always converges to same bias point(-63V) under any configurations.
My amplifier is built in following configurations.
10K output transformer, Eb=210v(273-63), self bias(Rk=400ohm, share both parts), auto balanced phase split(using 12by7).
I varied cathode resistor from 180ohm to 500ohm, and output impedece from 10K to 20K.
At final, plate current is 75mA - 100mA per tube, which supercede the allowable heat dissipation of 6p1p.
Sound is good and has very powerfull base.
I think this phenomina shows the typical characteristic of self bias configration.
BTW I expectd 6p1p is very close to 6aq5 or 6v6, but 6p1p seemed something quite different form 6aq5.
Any responces will be appreciated.

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Topic - russian 6aq5(6p1p) - alex 08:51:10 05/27/06 (0)

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