[Amps] HV rectifier strings - to bypass or not?

[Carl]

I get most of mine in bulk off Fleabay

Carl
KM1H


----- Original Message ----- 
From: <K1SG at aol.com>
To: <amps at contesting.com>
Sent: Sunday, October 31, 2010 11:21 AM
Subject: Re: [Amps] HV rectifier strings - to bypass or not?


> Hi Carl,
>
> Sounds like a good suggestion.
> I went looking for suitable HV capacitors in the Mouser, DigiKey, Surplus
> Sales and RF Parts catalogs, and found that Vishay/Sprague makes a nice 
> .01
> uF 20 KV capacitor that sells for 68 cents...but no one stocks them, and
> the minimum order is 5000 pieces! I didn't see any of the .0047s at all. 
> Any
> suggestions on sources?
>
> Steve  Gilbert
> K1SG
> K1SG at AOL.com
> 508-435-9133
>
>
> In a message dated 10/31/2010 3:37:43 A.M. Eastern Daylight Time,
> amps-request at contesting.com writes:
>
> Message:  1
> Date: Sat, 30 Oct 2010 20:50:37 -0400
> From: "Carl"  <km1h at jeremy.mv.com>
> Subject: Re: [Amps] HV rectifier strings - to  bypass or not?
> To: <audioguy at charter.net>, "AMPS"  <amps at contesting.com>
> Message-ID:  <016301cb7895$a4272480$6501a8c0 at DAVES>
> Content-Type: text/plain;  format=flowed; charset="iso-8859-1";
> reply-type=original
>
> White noise is real but in an amp with RX/TX relay  isolation you wont 
> hear
> it and it may not occur with big diodes.
>
> It  is noticable with SS receiving and audio gear and a single .01 or so
> bypass across each leg of the rectifier takes care of it.
>
> I like to  add a single .0047 across the full string in an amp and another
> at
> the  output to ground to keep any high intensity and transformer stretched
> spikes from bothering the diodes or electrolytics. The one to ground also
> catches any stray RF that the plate choke or its bypass  missed.
>
> Carl
> KM1H
>
>
>
>
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