[R-390] You don't see this every day

[Tim Shoppa]

Don writes:
> It probably wouldn't be too difficult to make a speech amp to drive 
> the screen for AM (or maybe even modify the oscillator into a speech 
> amp), although screen modulation is pretty funky and you wouldn't 
> want to try producing anywhere near 100% modulation.  If you 
> predistort the audio, you can often get to 75-80% modulation with OK 
> performance.

Does it have abeam or pentode output tube? The tube in the auction
pic looks like a good old triode. But maybe it has a couple of 813's
in the final or something that I cannot see.

Tim.