[BC] Richard B Johnson at Wilkinson

[Miltron]

Negatory, Richard !  The early RCA FMs, the BTF-5A, BTF-3B, &c used a pair of 7C24/5762 triodes in a grounded grid circuit, one driving the other, each in its own tuned "stovepipe".

Also, in the quote below, you seem to have accidentally swapped AEL and ITA........
M

-----Original Message-----
>From: RichardBJohnson at comcast.net

>There were lots of start-ups from AEL in Lansdowne, PA. The basic AEL designs were used by ITA, CCA, Sintronic, etc., etc., with little modification until solid-state came into vogue. Most of the engineers who started these companies at one time worked for AEL, some as test technicians, and some as engineers. Bill Johnson (no relation), Chief Engineer of Wilkinson Electronics, also had worked for AEL. Therefore, most of the FM transmitters were similar, except for Collins and RCA. Even though RCA pioneered grounded-grid amplifiers for television, their FM transmitters were all grid-driven tetrode amplifiers, including the "blowtorch" design http://www.abominablefirebug.com/Job/RCA.pdf CCA's founder, Bernard Wise, having worked for RCA, insisted that grounded-grid designs be used in his company's transmitters.[snip]