[Heathkit] sb200

[Larry Asp]

I had one of these years ago, and had a couple of incidents of low output 
develop. The first occasion was the tubes began to go flat. The second 
problem was a filter capacitor (or was it one of the diodes - cant remember 
now) - since there are several in the power supply, the failure of one of 
them will make a difference. Also - what kind of rig are you running into 
it? I ran mine with a TS820 - which always drove it to the max. with no 
problems.
----- Original Message ----- 
From: "ted" <ted1970 at sbcglobal.net>
To: <Heathkit at mailman.qth.net>
Sent: Friday, August 18, 2006 9:16 PM
Subject: [Heathkit] sb200


Still cant get full output from amp.Plate voltage near 2400.Have   -123 
volts at grid.I replaced the 20uf and 2uf ,both rated 150 volts. Output abt 
375watts.I noticed tubes can get red if keying a little prolong.Only thing I 
havent done is install 2 new tubes.Tried used spares. I just feel something 
else is wrong.When I key amp grid voltage drops to say -54 volts.If anyone 
can help with some idea ,greatly appreciated.Ted
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