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.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: Patrick Barthelow
Sent: Sunday, February 05, 2012 12:56 PM
To: amps@contesting.com
Subject: [Amps] Alternative input network Upgrade for SB 220
Friends,
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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