Three tube rig for 3.5 MHz CW

From left to right: power supply, two tube regenerative receiver (3.5 MHz), one tube transmitter (5 W, XTAL). The cabinets are recycled from old PC power supplies and vacuum tubes came from junked BC radios.

Power supply opened. 200 VDC and 6.3 VAC for both TX and RX.

Transmitter opened and upside down.

Basic design was taken from these sources: http://nmwilliam.tripod.com/el84.html by VU3GAO

http://www.dl9eba.de/qrp1.html by DL9EBA.

QSK circuit was added and some other minor modifications made. EL86 tube was used.

Inside of the receiver, upside down. It is built using The Regen-o-flex receiver design by Dave Schmarder. I used ECC85 and EL84 tubes and limited the receiver coverage to 3.5 MHz CW band.