RivaScoot wrote:
snip
Speaking of these vintage receivers lacking digital readout, would it
be possible to add such a display or are there third-party displays
out there?
I don't want to do this, mind you, this is just another one of my
off-the-wall questions. 
RivaScoot
Yes. Here's a place that offers various kits:
http://www.aade.com/dfd.htm