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Re: [Amps] Alternative input network Upgrade for SB 220

To: "Patrick Barthelow" <>, <>
Subject: Re: [Amps] Alternative input network Upgrade for SB 220
From: "Jeff Blaine" <>
Date: Sun, 5 Feb 2012 19:19:21 -0600
List-post: <">>
WD7S had a board available and that may be what you have seen.  But I think 
he's changing designs though.  You may like to query him about it.


-----Original Message----- 
From: Patrick Barthelow
Sent: Sunday, February 05, 2012 12:56 PM
Subject: [Amps] Alternative input network Upgrade for SB 220

Somewhere I saw a  3 -500Z input network aftermarket kit  that was a long 
narrow board with the coil/cap combos mounted side by sideon the board, and 
available for 3-500Z or perhaps SB 221  installations.
I did not see it at the Harbach website.
I received a very mangled SB 221 input network that I am trying to fix, and 
having extreme difficulty due to the age, and density of mounting   the 
cardboard coil formers,  making them brittle, and subject to easy breakage 
if disturbed in the process of removing and replacing all the silver mica 
capacitors, that were all assembled and soldered in sequence to a central 
grounding terminal.   I have heard the 35 year old coils are sometimes 
troublesome if any need to be tuned by the internal slug positioning, 
sometimes breaking in that process too.   It is exceptionally difficult to 
even read the values of the SM capacitors in situ.   Any input network 
packages out there?  Tnx, 73, Pat AA6EG
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