[MrFixr55]

Congrats on the progress so far. I read somewhere that the less voltage on a 200A the better. I read also that a 200 is more sensitive but less loud. That is strange, as the amplification factor for a 200 is higher than a 201. The spec for plate voltage on a 200is for 25V as a detector. For a 201 as a grid leak detector, the plate voltage should be 45V. Despite what might be put on the box, I can't find any specs for use of a '00 or 00A as an amp or for any other use than a grid leak detector.

You may also want to use a headphone coupled by an AA5 transformer, as a 201 puts out about 10mW of power. make sure that you are using the correct negative bias on the Output tube depending on the tube used and the B+ voltage used.

The first radios marketed by Westinghouse (Aeriola Sr.) and GE for commercial use, as well as the IP501 marketed to the US Navy used a single tube as a superregenerative grid leak detector. In the case of the Radiola II and III, the Westinghouse RC, the GE 1300 and 1400 pair (Radiola V) and others, there was a stage or 2of audio after the detector. What negated the need for RF stages was the regeneration. Regeneration was covered by the 1914 Armstrong patent.

There was very little use of diode detection till about 1933. An interesting departure is the Philco Model 3 auto radio, which used a 71A (of all things) as a detector, with the plate tied to the cathode as one element and the grid as the other, making it a diode. I wonder if no one used diodes until the Fleming Valve patent ran out. The history of RCA is the history of lawsuits, as they were primarily a marketing and patent holding company until they actually started manugfacturing radios.