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[AMPS] SB-220 HELP

To: <amps@contesting.com>
Subject: [AMPS] SB-220 HELP
From: dbr@alumni.caltech.edu (David B. Ritchie)
Date: Mon, 17 Mar 1997 11:00:56 -0800 (PST)
Check the bias circuit
Dave N7UE


On Mon, 17 Mar 1997 CATALANO_DENIS_E@hq.navsea.navy.mil wrote:

>      I have several SB-220's which I have worked on over the years to keep 
>      going.  I'm not an amp expert, but have fixed several.  Most of the 
>      time, the problem is in the HV power supply.  This time it's not, the 
>      meter shows about 3,200 V, so I have HV, and the tubes are lit.  The 
>      problem is there is no power (0 watts) out, with 100 watts drive on 
>      all bands.  There is continuity between the HV power supply and the 
>      plates of the tubes.  Also, the relay appears to be working, ie. they 
>      click when energized, and a continuity check from the input to the 
>      grid caps look good when keyed by hand.  One other thing, this amp 
>      failure was without sparks/ smoke/ fire as my other enlightening 
>      experiences have been.   Any ideas or suggestions appreciated. 
>                                                  73 Denis W4DC (x-WD4KXB)
> 
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David B. Ritchie, Esq.
D'Alessandro & Ritchie, P.C. -- Intellectual Property Lawyers
3521 E. Yorkshire Road, Pasadena, CA  91107-5432
818-683-8800 (TEL)   818-683-8900 (FAX)   dbr@alumni.caltech.edu


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