EWBrown wrote:I finally completed "Chubby Clementine" today, using a NOS Tung-Sol 6SL7 and two of the Russian 6L6GCs. OPTs are the Edcor GXSE10-8-5Ks, and the power trannie is an oddball MPS prototype, 300-0-330 @ 120 mA and two 6.3VAC @ 3A filament windings, one of which is also tapped for 5VAC
It sounds amazingly good, and after four hours running, it sounds a bit better than on initial power-up, seems to have smoothed out and developed more low and high freq response - the caps and OPTs had to break in.
The B+ at the OPTs is 370VDC, and each 6L6GT is drawing about 55 mA, 27.5VDC across the paralleled 1K 2W cathode resistors. PD is running just about 18.9W, or 63% of the tubes' max 30W PD rating. The 6SL7 B+ is 320 VDC, and it is running at about 1.15 mA, each triode.
Its power supply is a bit beefire, I used 4 X 180 uF / 500V caps, and two Hammond 156R (C354 equivalents) in teh filter string - I replaced teh 100 ohm series resistor with the second choke.
This is the "triode mode" circuit, I may try the "ULtra" mod later on, should be a relatively easy mod to perform, even with the board wiring directly soldered, with no terminal strips.
Photos coming soon...
Now, what to do with the second Clementine board...
/ed B
EWBrown wrote:... I'll kick up the B+ around 430VDC, and try the "big dawwg" tubes
Users browsing this forum: No registered users and 68 guests