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From: N_Cook on 29 Oct 2009 13:32
Exploring the 6L6 a bit more there was continuity between the base pin and
G3 but the internal contact to the cathode was missing. Presumably a
deliberate weak fusible link in whatever occassions a plasma arc strikes
between cathode and anode.


From: N_Cook on 31 Oct 2009 10:28
I cut the pins at the base of the 6L6 envelope to see that area and the
ribbon that connects to the cathode tube is spark eroded to a ragged break.
This ribbon is 0.5 x 0.04mm in section, if it was copper then I make the
rupture current would be about 6 amps. Presumably failed at a weld spot so
less than that

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



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