[R-390] OA2 and Freq. Readout

blw [email protected]
Thu, 10 Jul 2003 19:23:57 -0500


Les,

I think I put in a used OA2 from that deal on pulls about 2 years ago. A few
people on the list contacted me and ordered from that guy. I got about a
dozen of them and a lot of other R-390A tubes. Anyway, it works like a champ
now. I think those tubes were only a dollar each, or something like that.

Thanks for that advice on drift. I put the radio back in the Bud cabinet
last night. 


Barry non-Hauser


> Did someone call???
> 
> The replacement of the OA2 on the SP-600 (V-18) is mentioned in the AN
> 16-45-221 Handbook Operating Instructionson page 13. This is the Air Force
> Manual 
> dated June 27, 1952. Just because an OA2 voltage regulator tube glows purple
> doesn't mean it is regulating the 150 volts. I have found most older OA2's to
> be 
> bad, and routinely replace them. It can and will also affect the sensitivity
> of the SP-600 as well as cause excessive drift.
> 
> 
> Les Locklear
> Gulfport, Ms.