This is the Ca. 1930 TPTG CW Transmitter in the NEWSM collection.
This TNT Transmitter is significantly more heavy-duty than the two TNT transmitters in the NEWSM collection, and has three tuning capacitors instead of just one, that makes it a TPTG design and not a TNT. As with TNT #1, it is similar to the plans in the December 1929 issue of QST magazine with updates published in the 1934 ARRL Handbook, but this one has adjustable capacitance for both the Grid Tank circuit, and the Plate Tank circuit. The third adjustable capacitor is part of the antenna tuning circuit. This one has a ??? tube (?V Filament, ?Vmax @ ? mA). We need to measure the inductance of the plate and grid coils to determine the frequency of operation.
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