In Reply to: RE: Questions about 6BG6G amp build (schematic) Grommes 216BA posted by Michael Samra on May 23, 2017 at 03:07:41:
Thanks very much Mike. (we go back about 10 years, I reckon). This Williamson circuit is reminiscent of my old Heathkit W5Ms (now sold), which I meticulously restored. It used 5R4s which I understand require smaller 1st cap. Also I am running out of room underneath this monoblock chassis. I plan to use 5R4 to drop B+ a bit (but have MANY diff 5V rectifier tubes). I'll do 30f film.Honestly did not know increasing choke would "kill dynamics and roll off the high end". I use 10H - 20H in preamps, but that's a different animal. Schematic for this calls for 2.6H. Anyone want to trade some good 6H and 9H chokes for a pair of 2-3H chokes? :)
Speaking of the Hk W5Ms, I switched the 12AU7s in those to 6CG7s - there was no benefit whatsoever - I may have even lost something. What if I plugged in 12FQ7s (which I have) or even 12BH7 (have dozens) to the signal tube positions? There isn't room for 6SN7s.
Pic shows my chassis layout test. (A choke sitting where the OPT will go.)
Thank
Petein Denver
Edits: 05/23/17 05/23/17
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Follow Ups
- RE: Questions about 6BG6G amp build Grommes 216BA - Pic - PeterI 07:08:06 05/23/17 (4)
- RE: Questions about 6BG6G amp build Grommes 216BA - Pic - awesterner 21:32:53 05/25/17 (1)
- RE: Questions about 6BG6G amp build Grommes 216BA - Pic - Michael Samra 08:59:18 05/27/17 (0)
- I'm not saying it can't work and I love the W5ms - Michael Samra 12:35:46 05/23/17 (0)
- Coupling cap values seem ok? NT - PeterI 07:20:43 05/23/17 (0)