[Milsurplus] BC-342 Help Needed Again

[gl4d21a at juno.com]

Those two tubes have their filaments in series.  The limited information I have at hand doesn't show specific pin numbers, but the filament is 2 and 7 on both of them. (And the BFO which is in parallel with the 6R7).  I presume you are using the AC supply, so there should be 6 VAC on one of the 6F6 pins and on one of the 6R7 pins.  The other ends of each filament should be tied together.  That center tapped filament transformer makes tracing confusing if you are not careful.  One way to get around that is to make all measurements referenced to one of the 6V rails, then it measures more like a grounded series circuit. Those sockets have been known to loosen, or a wire might have broken at a socket due to flexing when the tubes are installed.  See where the series circuit is broken.  Because the 6R7 is paralleled by the BFO (6C5)filament, that makes the 6F6 most suspect.

HTH
George
W5VPQ


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