I am considering building this regenerative radio and then using it as
a solid base for a lot of little experiments in sadistic
radio-electronics, like AF filtering, bizarre LC tuning and
calibration tricks, maybe adding a CW TX etc etc.

- Are the RF coils separate or in series? Do they have link windings?

- I see that the tuning scale covers an arc of almost 300 degrees.
Is tuning by varicap diode + potentiometer (multiturn pot mod
beckons....) or is it capacitor + slow-motion drive ?

- Is regeneration control by DC- or RF-throttling?
Both have pros and cons...

- As designed, does it cover the whole spectrum, or portions of it?

Also, have you EVER heard of anyone adding a QRP TX to this box, for a
just-in-case QSO?

Thanks in eager anticipation!

Filippo
N1JPR/I2