[R-390] Intermittent

[Gary Harmon]

My R-390 has intermittent signals.
 
Sometimes broadcast will come on in about a minute and then operate for
hours before the signal drops out.  It may come back or it may not.  When it
drops out or comes on it does it slowly like something turning on or off.
When the signal drops out, audio hiss remains.
 
All tubes have been checked but not lengthy tests.
 
Suggestions anyone??
 
73,
 
Gary H. Harmon, Jr. - K5JWK
6003 Archwood
San Antonio, TX 78239-1504
210.657.1549h
210.884.6926c