[Heathkit] SB-220

[Duane Fischer, W8DBF]

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From: Don Flenner <w4ych at earthlink.net>
To: heathkit at mailman.qth.net
Subject: [Heathkit] SB-220
Date: Thursday, November 25, 2004 11:06 AM

Greetings All and Happy Thanksgiving,

I recently acquired a SB-220 in a non working condition...The problem is:

When the antenna change over relay is energized I get no idling plate 
current...

The 3-500Z's light up, I have checked them in another amp and get the proper 
idling plate current, the plate voltage reads 2500 in tune and 3200 in SSB. 
I have changed the 5.1 volt zener, checked the wiring of the antenna relay. 
The plate current meter deflects when a put an ohm meter across it, so I 
amuse the meter is OK.  Also, as a further test to make sure it was not a 
meter problem. I hooked the amp to a transceiver. With the amp off I get 100 
watts out. When I turn the amp on and press the PTT, the relay energizes in 
the amp but no output.

Sure could use some guidance from the knowledgeable on this reflector.

Thanks in advance.


73,
Don, W4YCH
http://www.home.earthlink.net/~w4ych
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