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#11

03-16-2023, 09:53 PM

bandersen

RCA 741PCS

Join Date: Mar 2009

Location: Chicago, IL

Posts: 8,779

3 & 4 are the tube filaments. I wouldn't worray about them since your tubes are lighting up. I suggest checking the 12CA5 audio output tube and the 12DQ6 horizontal output tube.

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