Note
CQ, Oct 1963, p. 38.
QST, Dec 1964, p. 160.
The 621 VHF transmitter ran 60 watts CW and plate modulated AM on 6 and 2 meters. It used seven tubes and included a built-in dummy load. A front panel switch selected five crystal positions or VFO operation. Amplidyne made a model 261 VFO and a model 221 plug-in unit to put the transmitter on 220 MHz.
Features
– High level plate modulation
– Full metering of all circuits, including RF output
– VFO and antenna relay controls built in
– Built in dummy load
– Four internal crystal sockets and one socket located on the front panel for easy access
The 621 uses an 8150 compactron, which is designed for full rated operation to 175 MHz.
