[R-390] another crystal question

[Flowertime01 at wmconnect.com]

Scott,

After 50 years we could expect a thermostat switch to go bad and fuse shut.

The covers should not be hotter than you would want to touch. The cover 
should run cooler than the 6AK5 tubes. More like a 5814 tube temp. Just a 40 
year old subjective memory.

For sure you can clip the wire and run with the oven off. The crystals may 
be off a few 100 hertz after not warming up to full temp. But the receiver 
will work and can be aligned to operate with what ever frequency you do get 
from them.

Roger Ruszkowski AI4NI