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In Reply to: 6Y6GT/6922 Link to larger schematics and PDF file posted by jyourison on March 28, 2015 at 11:52:01:
Hi, All,
I have added the tweaks discussed in the thread below, and am attaching a new PDF set of schematics.
- Added the missing 'lytic cap on the end of the power supply, after the B+ rail is split into channels. I use a F&T 32 muf x 32 muF double cap. The 10 muF film caps shown in the original are maintained, and could be reduces slightly if needed (4.7 muF should be fine).
- Reduced the current through the 6922 from 8 mA to 6.5 mA via the CCS.
- Changed the resistance on the MOSFET splittler legs (a) to be equal on the upper and lower legs and (b) to pass 6.5 mA through the MOSFET to match the current through the 6922.
The 'scope now shows things to be nicely balanced and the full 2Vrms sine waveform is no longer clipped at the MOSFET.
Due to the added capacitance and the reduced current draw through the splitter, B2+ and B+ voltage readings have risen some (about 2-3VDC). But the voltages in the splitter legs are much better, as the CCS also "eats" the excess plate voltage on the 6922 at the slightly lower current.
The amp sounds great!
--Jeff
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- RE: 6Y6GT/6922 Link to larger schematics and PDF file - jyourison 12:06:26 05/14/15 (0)
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