[Amps] AL-1200 Glitch Resistor

Paul Christensen w9ac at arrl.net
Sun Apr 12 08:25:50 EDT 2015

I'm working on an AL-1200 for a friend.  While finding the problem in the 
PS, I noticed that a glitch resistor is absent in the design that would 
otherwise limit HV fault current.  I verified this on both the schematic and 
by tracing actual amp wiring.  I was expecting a resistor (e.g., 50/50W) in 
the B- lead, or in the alternative, in the B+ lead with appropriate 
isolation.  While the 3CX1200 may be statistically immune to flashover, it 
seems a good idea to include one to ensure that HV fault current is limited 
under all conditions.

Has anyone here added one to their AL-1200?

Paul, W9AC 

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