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RE: Questions about 6BG6G amp build (schematic) Grommes 216BA

It is a variation on the Williamson theme. Compare it to the self biased Heath W5M.

The suggestion to use 6CG7s instead of the less linear 12AU7 is quite sensible. Remember, Williamson used 6SN7s and the 6CG7 is electrically "equivalent" to the 6SN7.

20 muF. in the 1st filter cap. position is good, if the rectifier is a 5R4, but more is OK, if a 5U4 is used.

5R4 data sheet
5U4 data sheet

Eli D.

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