[R-390] AGC action on oscillator frequencies, cures?

[Tim Shoppa]

I usually use my 390A to listen to (surprise!) AM SW and BCB broadcasts.

And when I do use it for CW, I usually turn off AGC (unless I am in fear
of my eardrums being broken!).

But sometimes I turn on the BFO and use it with AGC, and it's obvious
that oscillator frequencies are shifting about (hundreds of Hz) under
strong AGC action.

The 17MHz oscillator (below 8Mc bands) seems to do the most shifting.

This has been discussed here before, and the concensus seems to have
been that AGC action on the mixer tubes causes varying loading on the
oscillator, but have any cures/mods ever been propsed/discussed/shot
down?

Tim.