[Amps] SB-220 help

[Jim W7RY]

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 at gmail.com>
>To: "Amps" <amps at 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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>>Amps at contesting.com
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>>
>>
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