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Check the listing for details. SCHEMATIC ONLY 80/40 Meter QRP Ham Transmitter Using the JAN 1299/3D6 Pentode. Condition: New. Listed at 19.00 USD. Though it does not quite have the RF power output that is possible with the 6V6 tube, the 2.8 volt 1299 pentode makes an unusual QRP transmitter that is practical for portable use. The 1299 does not have a cathode, so how do I get the Colpitts oscillator to perform, per usual, with no issues?.