Here:
http://wy6k.com/homebrew_stuff/essential_mod_sb220.htm
And here:
http://www.somis.org/sb220ci_diag.gif
73
Jim W7RY
-----Original Message-----
From: R Johnson
Sent: Sunday, July 14, 2013 11:33 PM
To: Carl ; mike stokes ; Amps
Subject: Re: [Amps] SB-220 help
Hi Carl:
I remember the problem, but I can't find the "Heath App Notes" I had saved
on one my old machines.
Maybe you could give a little more info for the "NEWBIES" on the list.
I have 10 old HD's I would go thru to find my old "Heath App Notes"
directory !!!
Maybe you can do a better retrieval job than me :-) !!!!
73 Bob, K1VU
FDN42ma
At 08:22 PM 4/23/2013, Carl wrote:
Early 220's had a problem with shorting the filament/bias transformer if it
was wired for 115V and the zener shorted. There is a change notice on the
web.
Carl
KM1H
----- Original Message ----- From: "mike stokes" <mike9v@gmail.com>
To: "Amps" <amps@contesting.com>
Sent: Tuesday, April 23, 2013 6:28 PM
Subject: [Amps] SB-220 help
I just picked up a used non working SB-220. Suppoesdly the filament
transformer smoked. Still have to pull it apart and see what is going
on inside. Tubes are supposedly still good.
The question I have is it possible/likely that a tube failure caused
the filament transformer to smoke ? What is the best way to check the
tubes to insure they don't cause more problems ?
Thanks in advance.
--
Mike Stokes
KK9V
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