[Amps] SB-220 diode failure

[John Adkins]

Thanks for the suggestions earlier this month regarding the SB-220.  You may recall that after
replacing a failed diode on the PC board, resting plate current was 0.3 amp instead of 0.120.  The
zener diode had indeed been blown.  I replaced it with a string of 7 diodes across a parallel .01
muF capacitor as suggested by Rich Measures.  The amp tunes up fine now.  (Except for a bit of
intermittency of the grid current meter.)

John
w4kv


		
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