MagneQuest/Peerless Forum

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RE: FS-100 PF and GM70 and 845 amp DIYers

Posted by gluca on June 25, 2018 at 14:45:32:
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.