Hi Dave – It says it right on the box. It is a current regulator. They were often used in series with a tubes filament to maintain a constant current. Think of the 3TF7 in the R390A. 73 – Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115
From: [email protected] <[email protected]> On Behalf Of Dave Merrill
Sent: Sunday, April 9, 2023 6:51 PM
To: Military Surplus net List <[email protected]>
Subject: [Milsurplus] Western Electric 13P Resistance Lamp
Anyone know what this is for? Some kind of ballast tube, made in 1963. Searching the FSN came up empty
Dave N9ZC