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Old 24th Feb 2021, 12:13 am   #7
G0HZU_JMR
Dekatron
 
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
Default Re: MK.123 spyset bfo fault.

One other thing to consider. If there is 13V DC at R30 (10k) then this means 1.3mA cathode current in theory. With 150k at the screen grid and 220k at the anode and only 100V HT I'm not sure how this adds up. What DC voltages do you see at the anode pin and the screen grid when you see 13V at the cathode when it is not oscillating? Is R30 definitely 10k ohm? (green dot says it is)
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Regards, Jeremy G0HZU

Last edited by G0HZU_JMR; 24th Feb 2021 at 12:19 am.
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