1 triode (RK-34 paralleled sections) Hartley TX and 2 triodes (one 12AT7) Twinplex rx. Russian headset, MARCONI-NATO swedish key, 70m dipole balanced feeder, unbal-to-bal tuned impedance matcher at ladder line start. 7Watts.
At rightmost side, the changeover control box and the station power supply. B+ at Hartley is electronically stabilized by 6BG6 + 6EJ7, 400 VDC. Rx is at 150V after OD3/VR150
And still in 2022 it is perfectly possible to make solid QSOs over hundreds of miles, such way.
Chris, do you have a private email? I would prefer not to share schematic on here because I gave the article to SPRAT and they are not-for-profit.....the magazine that holds the GQRP club together.
Thank you Chris. Great stuff! I love it!! I have designed several regens (constantly trying to improve :-)). My best to date is one that SPRAT magazine were kind enough to publish a short while ago. It covers 80m and 60m. However, slightly more complex than the elegantly simple Twinplex. It features my own design 'regen heart' (I have moved away from grid-leak detector in optimising for SSB and CW) and also has an RF buffer stage plus a simple method of introducing good but simple low pass or peaking response to the dual-triode AF/speaker output stage.....hence a little more complicated. I wasn't striving for total minimalism on that one though...rather best compromise between number of components and performance. Also, I am still using xtal control for my two valve/tube transmitter.
Chris, this is absolutely excellent! Thank you for posting and for helping to illustrate how magically simple, good-enough, equipment can work well for communication and provide enormous enjoyment for little outlay. I imagine you enjoy great satisfaction from each QSO!!