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Hello!
Anyone has the circuit by using 12AX7 and 6AQ8 as drier stage for 300B push pull to share?
Thanks!
Follow Ups:
Consider a Mullard style circuit, without a GNFB loop, using a 12AX7 section voltage amplifier and a 6AQ8 LTP. A 10M45 CCS goes in the LTP's tail.
Eli D.
Why must you use 12ax7 & 6aq8 ???
You have better choices. Significantly better would be 26 into 4P1L into a phase splitter transformer like a Lundahl. Or for the first stage, if you want to shoot for the stars, Ale's 01A Gen 2 design, which is stunning and in a world of its own. He has PCBs.
I suspect the OP has the types mentioned on hand and wants to use them.
Eli D.
Exactly!! I have got tons of 6AQ8 recently and have some JJ ECC83 as well.
I know someone has a RC coupled 300B pp amp that has both tubes in the driver and sounds wonderful!!
The 6AQ8 contains triodes "equivalent" to those in the 12AT7. They sound good with 200-220 V. on the plate and an I B of 3 mA.
The triodes in a 12AX7 make quite decent voltage amplifiers. What they can't do is drive loads. DC coupling those triodes to LTP grids, Mullard style, is "just what the doctor ordered".
FWIW, I like the idea of PP 300B "finals". Cancellation of the (IMO) excessive 2nd order HD the type produces will occur. ;> )
BTW, you may be able to use AC powered 300B heating, as the cancellation effect applies to filament hum, as well as 2nd order HD.
Eli D.
Whether using 12AX7 and 6AQ8 as driver tubes would be perfectly driving 8 x 300B?
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