Electric Blanket Repair

[Findm-Keepm]

Originally Posted by bgadow

At one point I had a controller (only) for a 50's era Simmons electric blanket. Bakelite case, had a vacuum tube in it. Sold it to somebody on the ARF.

Vacuum tube - probably a thyratron? I can't imagine the need for a traditional vacuum tube of any sort. 2D21/PL21 tubes were commonly used in controllers in the late 50s/early 60s.

[N2IXK]

Originally Posted by Findm-Keepm

Vacuum tube - probably a thyratron? I can't imagine the need for a traditional vacuum tube of any sort. 2D21/PL21 tubes were commonly used in controllers in the late 50s/early 60s.

There was a tube specifically made for electric blanket controllers, the GL-1367 fused thyratron made by GE. It was later EIA registered as the type 5662.

It had 2 cathode pins, with a fusible link connecting them. If the current through the link exceeded 2.25 A, it would open, cutting off the power.