Grid to filament short in one or both tubes.
73, Alek, VK6APK
On 6/10/2020 2:03 am, Steve AA7V wrote:
Hello to the group;
My SB220 has started to act up.
Immediately upon power on, the 3-500s both start drawing plate current. The
meter shows approximately 250 ma of current. It is apparent some component
has failed.
Also, it appears the grid current meter is showing a negative value (if
this is possible) as the needle now rests on the left peg.
I am not adverse to troubleshooting to the component level but would
appreciate any advice as to how to narrow my search to a specific set of
probable causes.
If I am unable to fix this amp, does anyone have any recommendations
towards a person that works on SB220s?
Regards
Steve AA7V
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