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Re: [Amps] HV rectifier

To: Paul Kraemer <>, Amps Reflector <>
Subject: Re: [Amps] HV rectifier
From: "Bob Wilson, N6TV" <>
Date: Sat, 29 Jun 2019 23:30:28 -0700
List-post: <>

So it looks like the one pictured here:


It seems "4JA421" is the GE "series."  I don't know what the MX55 means.
The one in the photo linked above ends with EX12S.  Maybe that's just a
date code or batch number or something; probably not significant.

On Page 48 of the 1964 Allied Electronics Catalog pictured online here
it says:

GE 4JA421 Series Potted Rectifier Circuit
Max Amps:  0.65
Max PRV:  10,000

(PRV = Peak Reverse Voltage)

On Page 41 here
*Motorola's* Silicon Rectifier Stacks include a few schematics.  I'm
guessing the Motorola "Full Wave Center Tap Rectifier" schematic also
matches the three terminals on the GE part, but that's just a guess.  Maybe
you can verify with a diode tester?

Hope that helps.

Bob, N6TV

On Sat, Jun 29, 2019 at 8:24 AM Paul Kraemer <> wrote:

> I found a couple hv rectifier blocks in my stash but unable to id them.
> General Electric logo part no. 4JA421MX55.
> Any help?  They are 1" square by 5.5" long with terminals on top, one at
> each end.
> Paul K0UYA
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