I'm restoring a 50s vintage EICO 720 transmitter.
I'm in need of a 50 k potentiometer rated at 4
watts (or above) that is NOT wirewound.

I have an Eico 720 and I'm 99% sure that the drive level pot is
wirewound in mine.

It's just part of a DC divider that sets the screen voltage on the 6AQ5
driver/multiplier. There's no AC so wirewound should be fine.

Lotsa radios in the 50's/60's and QST construction articles show
drivers with wirewound pots on the DC screen divider.

It has to dissipate a good chunk of heat. The way that Eico built this
radio there are all sorts of resistors to drop from the HV to B+ for
the oscillator/driver, it gets real toasty due to all those dropping
resistors.

Last time I looked 50K 5 or 10W pots were available in wirewound, I
think Allied or Mouser had the Ohmite units. I don't think you'll find
this sort of dissipation available in a ceramic pot. I'd recommend
that you go for something more than 4W if you replace it because it
does get warm.

Tim.