[Amps] Source of Mica Caps?

[Carl]

I still dont understand the claim made by a few that increasing gain and 
power output increases stability when hard grounding the grids.

I would take various web sites with a grain of salt and try to seperate the 
good from bad.

The 115pf caps were chosen by Heath at the end of the SB-220 run and a 
bulletin suggested changing them. The SB-221 and HL-2200 use the 115pf but 
Ive replaced with whatever 110 and 120pf I come across in bulk. Ive yet to 
have instability in a well built and updated SB-220, even on 6M, with the 
Heath design.

Carl
KM1H


----- Original Message ----- 
From: "Jim W7RY" <w7ry at centurytel.net>
To: "Randall K Martin" <rkmassoc at comcast.net>; <amps at contesting.com>
Sent: Sunday, June 02, 2013 4:38 PM
Subject: Re: [Amps] Source of Mica Caps?


> Ground the grids directly and remove the caps and chokes. BUT install a 
> glitch resistor in series with the B+ and a diode from chassis ground to 
> B- (anode to ground, cathode to B-).  W8Ji's web site has lots of 
> information on this.
>
>
> 73
> Jim W7RY
>
>
> -----Original Message----- 
> From: Randall K Martin
> Sent: Saturday, June 01, 2013 5:39 PM
> To: amps at contesting.com
> Subject: [Amps] Source of Mica Caps?
>
> Does anybody know where I can buy a replacement for one of the mica grid
> bypass capacitors used in the Heathkit SB220? I believe they are 115 pf.
> Can't find anything close in the mouser catalog.
>
> 73
> Randy K0EU
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