Tim -
Oops, sorry. V13 was the AVC amp, not audio. The diodes in the 12AV6 weren't used.
73, Garey - K4OAH Atlanta
Tim -
Not quite... The two tubes dropped from the "early" R-4A were V6, the 6GX6 Product Detector, and V13, the AM detector and first audio amp. The VR tube stayed on until the second version of the R-4B.
73, Garey - K4OAH Atlanta
Tim Kass wrote:
My R4B does NOT have the OB2, Drake removed that in the later R4A series, early R4A had the OB2 and 6GX6 product detector, but the 11 tube version of the R4A did away with it...73 Tim K8WBL
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