[Amps] Var. Cap. Identify

[Phil Clements]

> Need info. on an E. F. Johnson, split stator variable capacitor.  The
> Johnson label is damaged and all the information that can be obtained
> from it is: 0.125" spacing, Model No. 1X3-906 (the "X" looks like a 5
> and the "9" is not that clear either).
> 
> The capacitance of the sections, as measured with an Autek Analyzer
> at 3.5 MHz, is 70 -20 pF and 140 - 30 pF.  The number of plates per
> section is 8 rotor and 7 stator, and 4 rotor and 3 stator.
> 
> Need information on what voltage this capacitor can support and are
> the measured capacitance values correct?

Mike,
This is  most likely a 153-506-1.
4500 volts peak.
Max. cap. 155 pf; min cap. 24 pf.
Gap .125
Plates per section 17
Length from mounting hole to mounting hole 13 1/16 inches.

Let me know if this is the right one.

(((73)))
Phil, K5PC