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In Reply to: RE: RC-19 posted by Triode_Kingdom on October 25, 2016 at 15:36:50
My RC-26 does not include the 6AQ7 in the main pages, and it has disappeared from the RC amp table - though it is still listed in the "replacement use only" section at the back.
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The RC-19 might be the last manual with full specs. In addition to deleting it from the charts, my RC-21 only has a block of text under this type, indicating it to be an obsolete part. The original application must have been a radio where the diodes were used for AM detection or AGC. Maybe it was a WWII receiver produced in sufficient quantities to warrant the tube. Later models probably used separate diodes and/or were redesigned for miniatures. It's odd that none of these were produced with metal shells. Anyway, 'SL7s and 'SN7s were likely used in more applications than this tube, so they were manufactured and documented longer.
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Buy Chinese. Bury freedom.
The independent cathodes of the diodes indicate it was most likely intended for FM demodulation. Triodes with extra plates, but a cathode shared by all elements, were widely used for AM, but would not work for FM as normally implemented. Could have been for TV which has FM audio.
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