OD3 vs OD3A

[jimiclow]

Are they interchangeable? Other than the shape, I read something about strike voltage, 160 vs 180 volts. I'd like to buy spares.
Thanks.

 

[Paul Birkeland]

I believe the "A" designates straight glass, no letter is shouldered glass, and "W" is the funny looking brown one.

Other than size they are interchangeable.

 

[jimiclow]

Thanks Paul!
I ordered a lot of 5 NOS Raytheon JAN OD3A.