Dating marshall cabinets by serial number

Pilot offered "Redi-Blox" assembled modules in the late twenties to enthusiasts to help ease the mechanical side of kit building.

Around the time that the "Super-Wasp" was introduced, Pilot changed the name of the company to "Pilot Radio & Tube Corporation" (April, 1929.) "Super-Wasp" receivers were quite popular and sometimes were found in ham shacks of the late twenties and early thirties.

The three tubes were usually 201-A and the circuit used a regenerative detector followed by two stages of transformer coupled AF amplification.

The kit included detailed instructions along with an assembly drawing.

The lower right-hand switch was wired back to the K-111 to provide an "on-off" switch at the receiver.

The first AF amplifier was a resistance coupled amplifier while the second AF amplifier was transformer coupled along with an output transformer.

had long ago dropped the "toy" from their name and was supplying parts for the Browning-Drake BC receiver kit and also started producing radio parts.As a result, don't be hasty to judge a poor performing set as a "bad design." Check the receiver over carefully.An inspection of the soldering will usually be a clue into the level of workmanship you will encounter in your receiver.However, patience will be rewarded and it is fun to use a 1929 battery-operated receiver to monitor one of the many AM ham nets on 80 meters, especially when running the audio to a vintage horn speaker - talk about "broadcast quality audio" - well, 1929 style anyway! The tubes used were a type 24A cathode and screen grid tube for the RF amplifier, a cathode type 27 for the regenerative detector and two 27s for the AF amplifier.All of the tubes operated on 2.5vac at 7 amps for the heaters and the K-111 power pack supplied all of the A and B voltages required.

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All of the Pilot "Wasp" and "Super-Wasp" receivers found today will vary greatly in the quality of workmanship.

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