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In Reply to: RE: FS-100 PF and GM70 and 845 amp DIYers posted by Tanker on June 16, 2018 at 08:06:16
Hi there
what mA is your choke rated for? Mine was 100mA and I ran the GM70 at something like 90mA, PSU was full wave 866A and LCLC filter for power tube and full wave 866A LCLC for driver. I used stacked Film/Oil ASC motor run capacitor in the power supply and, if memory serves me right, a NOS 2uF/2kV sangamo paper/oil capacitor at the output. Take care of the filaments, go for a coleman regulator.
866A's are brutal, a damper diode in series might help in slowing down the initial transient.
That amp sounded great and with EIMACs was even better.
Follow Ups:
Gluca,
Thanks for the info. My choke was also rated at 100mA. Do you run your B+ at 1KV @90mA? Do you remember what total capacitance is in your power supply design? and power output you can get out of the GM70 & FS-100PF? Thanks
B+ was somewhere around 900V and I had 100uF as total C in the PSU. I was not shooting at max power as I have very efficient horns, you'd better plan for A2 to have some extra juice but I guess 15W would be possible in A1
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