Sorry you lost your beam YL. It must have been a really traumatic experience.
I did buy a box of dual gate mosfets many moons ago with the aim of transistorising my R206. I got as far as changing the EF50 oscillator and eliminated oscillator pulling when using it with a nuvistor converter on 2m but reverted to a valve when overcome with guilt but I admit to leaving in place the tiny FM TDA chip for 2m as it was so small to be almost unnoticeable.
The goodish news is I just repaired a broken earth lead that a visitor had tripped over. This connects to the unun and I can now report the LW Polish station on 225KHz has shot up from -92dBm to -75dBm and is now intelligible on the Andrus SDR. In fact I counted eight AM LW broadcast stations. Radio 4 went from -47dBm to -32.5dBm and I had to insert 20dB attenuation to eliminate spurii.
I met my very understanding wife G3SGL on 80m SSB back in the 60s.
main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of jdow
Heh, me be injuneer. Alas not hairy chested for some reason. So MY
R390A has been tweaked a little. It goes down into that frequency range. I used
it a little. I moved back to 20 meters SSB talking with folks in Oz after
dinner here. (nice folks.) At that time I had a TH6DXX at 70'. Gone with the
divorce. And I still think I won.