[Amps] High voltage rectifiers for Henry 3K

jeremy-ca km1h at jeremy.mv.com
Mon Dec 24 08:34:46 EST 2007


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 at rogerhalstead.com>
To: "José Arturo Molina" <joseart at navegante.com.sv>; <amps at 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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