Tube DIY Asylum

RE: Questions about 6BG6G amp build Grommes 216BA - Pic

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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.

Thank
Pete

in Denver


Edits: 05/23/17

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