Since when are resistors and caps used any longer in diode strings? Thats
ancient history.
Buy some 1N5408's for under 20 cents each and be done with it.
Carl
KM1H
----- Original Message -----
From: "Roger" <sub1@rogerhalstead.com>
To: "José Arturo Molina" <joseart@navegante.com.sv>; <amps@contesting.com>
Sent: Sunday, December 23, 2007 11:13 PM
Subject: Re: [Amps] High voltage rectifiers for Henry 3K
>
>
>
>>I need to replace the two high voltage rectifiers in a Henry 3K. The
>> parts list says 1.2 amps at 15 KV.
>
> Those molded rectifiers are just a string of high voltage diodes,
> resistors
> and bypass caps in a molding compound.
>
> If you really want to make one, just use some plaster of paris and use the
> original to make a mold. Then fill the mold about 1/3 full of resin and
> let
> cure to the point wehre the parts won't sink through. Layout the already
> soldered string of diodes, resistors, and caps (with end connectors) on
> the
> cured resin. Fill the mold the rest of the way and let cure. There will
> be
> some voids/air bubbles, but they shouldn't be a problem. If you really
> want
> to be thourough, make a simple vacuum chamber out of a metal pail and put
> the whole works in that after filling the mold. Just evacuate using a
> vacuum
> cleaner for a minute or two. That's long enough to get the air out and not
> long enough to ruin the motor in the vacuum cleaner. However do pay
> attention to the temperature of the vacuum cleaner motor. Use an epoxy
> with
> a low viscosity(thin) rather than high (really thick)
>
>>
>> Can anyone give me more info on these, or suggest a supplier, can these
>> be reliably made with a string of diodes?
>
> Check the ARRL Handbook.
>
> Roger (K8RI)
>
>
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