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RE: Power amplifier




>>If i do that could i remove cap between first and second stage?<<


Look at the 5-20 schematic again. The voltage gain tube IS directly coupled to the phase splitter. ;>)

What we are talking about is retaining the overall topology Mullard devised, but changing the small signal types. A 12BH7 section is adequate in the voltage gain position, when the I/P signal is 2 VRMS, which is what a CDP delivers. The 12AT7 is (IMO) SUPERIOR to the 12AX7 as a LTP phase splitter. The 'T7 has low Rp and high gm, along with a high mu. Those characteristics are DESIRABLE in that position. The distortion spectrum of the 'T7 is an added benefit.

Hop over to TDSL and study the data sheets for the 12BH7 and 12AT7. You want to set the 'T7 sections up with 200-220 V. on the plate and Ib = 3 mA.

Eli D.

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