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[AMPS] SB-220 TUNE Cap Arcing

To: <amps@contesting.com>
Subject: [AMPS] SB-220 TUNE Cap Arcing
From: measures@vc.net (Rich Measures)
Date: Tue, 13 Oct 98 08:51:41 -0800

>Following up:
>I took apart the parasitic suppressors (nichrome wire and 2 100ohm
>resistors in parallel) and the resistors measure ok.
>
>I cleaned the TUNE C and sanded or filed what little black or
>roughness (from the arcing) I saw on a couple of fins.
>
>I haven't had a chance to tune up to see any difference yet.
>If arcing still occurs, and if it is possibly parasitics
>at 110MHz as Rich comments, what can be done?
>
Increase L-sup to lower the anode-resonance's Q and Rp @110MHz.  //  Use 
a double-suppressor configuration.  (An example can be found on my Web 
site.)  
-  RE:  Adjusting R-sup:  The optimal ohms for R-sup is equal to the 
reactance in ohms of 
L-sup at the anode-resonance.  Ideally,  the VHF current divides in half. 
 

-  later, Bennett


Rich. Measures.  Web site:  www.vcnet.com/measures


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