Manuals and schematics :
Tube and Semiconductor Complement:
12BY7 for the driver and two 6146s
The Kenwood TS-520S is designed for SSB and CW modes in the 160 through 10 meter amateur bands. It also features receive of WWV at 15 MHz. There is an accurate analog display.
Power input is 200W PEP SSB and 160W DC CW. Other features include RIT, VOX, noise blanker, attenuator and carry handle. (This transceiver does not have general coverage receive).
Requires 120 VAC 50/60 Hz 280 watts. 13.3 x 6 x 14 inches 35.2 lbs (333x150x335mm 16 kg).