Mini Boatanchor: 12A6 QRPp Crystal-Controlled 40-Meter Transmitter

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Mini Boatanchor: 12A6 QRPp Crystal-Controlled 40-Meter Transmitter

33.00

It wouldn’t be right to describe this great little 40-meter CW transmitter as a boatanchor, even though its oscillator is a 12A6 beam power pentode tube designed for use in the audio section of many vintage receivers. It has 12-volt AC filaments and its main B+ voltage can be as high as 250 volts DC, according to 12A6 spec sheets. We have not nailed down the exact lineage of this QRPp transmitter, but we suspect it was from a kit produced many years ago by Bob Larsen, W7LNG (SK). It is beautifully constructed in a 4 X 8 X 1.75 inch aluminum chassis with removable bottom plate.  A screwdriver driven variable capacitor tunes the output to the antenna. An octal tube socket is the holder for a 40-meter crystal. An RCA-style phono jack is where you plug in your Morse key. Both FT-243 and HC6/U crystals were used during bench testing. Their note was clean and crisp with no noticeable chirp. With about 150-volts as the transmitter’s B+, we measured 300+ mW of RF output. With 200+ volts B+, the user can expect higher output – perhaps close to a watt. NOTE: A 40-meter crystal is not included in this package.

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