G6TVJ “Derwent” 80m AM Transmitter

A home-brew crystal controlled 80m AM transmitter. Xtal osc 6C4, RF driver CV138, RF PA 6146, Mic amp ½ ECC83, AF amp CV136, AF output (Modulator) 2 x 6L6, stabilizer 150A2, cal sine wave osc ECC82. Up to 20W carrier, 40W peak.   Mains power supply with separately smoothed RF and AF HTs. It is hoped the PSU unit may be replaced by a portable dyna-motor unit providing 350V HT 150mA.


Portable operation in Wales with Dyna-motor PSU and 80m inverted “V” aerial