The 10A Crystal Control unit used a 247 crystal oscillator, a 247 buffer amp, and a 210 output. Three plug-in coils wound on Hammarlund coil forms were used in the oscillator, buffer, and output circuits. A fixed-turn magnetic coupling winding on the output coil was terminated to either the optional antenna coupling unit, or to two white porcelain cone insulators mounted on the rear brace that spanned the top of the frame.The 30W was one of the basic building blocks of the 40B, and the 150A/B transmitters. According to 30W bulletin, it could be converted into one of these larger transmitters merely by adding other units and it was not necessary to discard any of the original equipment.
In July of 1932, the 30W was introduced at a price of $95.60, however, by January of 1933 the price had risen to $125.00.
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