This excellent detailed drawing is taken from the 1950 edition of the RCA Receiving Tube Manual which clearly shows the internal construction of a B9A miniature signal tube.
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High-quality pdf of the 1950 edition of the RCA Receiving Tube Manual [Size: 14MB]
For release this summer – this beautiful pedal is a true two channel tube preamp in a pedal. The circuitry is based on a Fender Blackface preamp section with a whole bunch of enhancements including:
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