So we're talking 40-50 years ago. Not today. That design was common for both 5 meter and 2-1/2 meter transceivers back then. The detector was superregenerative, though, and it only worked on AM. Such rigs were legal back then.....not so much, today. Ah, but you had to add a crystal and a switching system, and the output was less than a watt. What you had wasn't really a transceiver in the modern sense. There are plenty of designs for 1 and 2 tube regenerative receivers and 1 tube crystal oscillator transmitters, as well as solid-state versions of the same. I don't have a problem, I'm just commenting. Heck, I started out with a two-tube regenerative receiver and a 1 tube crystal oscillator transmitter. But I didn't stop there.