E F Johnson Variables

Garey Barrell k4oah at MINDSPRING.COM
Sun Jan 27 08:53:31 EST 2002

Fred -

The first number is the max capacity.

The last number x 100 is the "approximate" flashover voltage.

The type C is 5-1/2" wide x 5-3/8" high
The type D is 4-1/4" wide x 4" high
The type E is 2-5/8" square
The type F is 2-1/16" square

Dual section caps have second letter D.  e.g., 150DD45 is a 150 pf
maximum Type D @ 4500V flashover measuring 4-1/4" wide x 4" high.

73, Garey - K4OAH

----- Original Message -----
From: "Fred Holnagel" <w7prv at JUNO.COM>
Sent: Sunday, January 27, 2002 7:51 AM
Subject: E F Johnson Variables

> Does anyone know the marking system for Johnson variables?  I think
I may
> have it but not sure. I have one each of:
> 100FD30 and 100ED30. They both are duals so D must mean that. May I
> assume the 30 means 3000 Volt rating? Now the difference between the
> and the F?  Different appearance for sure. The stock number on the
FD is
> 155-508. Can't read the other. Thanks es 73's de W7PRV

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