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[AMPS] SB-220 Plate Voltage / Output Problem

To: <amps@contesting.com>
Subject: [AMPS] SB-220 Plate Voltage / Output Problem
From: 2@vc.net (2)
Date: Fri, 12 Oct 2001 14:17:52 -0700
>
>
>I recently try using my SB-220 on 15 and 10 meter trying to break a pile 
>up and found it was only putting out only 200 watts Max regardless of grid 
>drive and up to 500 ma Plate Current( saturated output with 20 watts 
>input) . In looking at the Plate HV Voltage, I am only seeing 1500 VDC ( 
>shouldnt it be @ 3000 VDC ??? )on standby unloaded. It looks like my 
>Voltage Doubler has failed somewhere. It is wired for 110 VAC and there is 
>no noticable damage components and wiring inside the unit. 
>What component would be the likely candidate to replace ??? 
>My DVM is only rated for 1000 VDC so how do I go about troubleshooting the 
>voltage doubler to find the bad part or problem ???
>
Measure the R of the three 4.7M? resistors to see if the voltmeter is the 
problem.   If you have normal ouput on 40m, my guess is crispy-crittered 
bandswitch contacts on 10m and 15m.  
.  
good luck, Jeff 

-  R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.  
end


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