[Amps] Heath SB1000 blowing fuses, fault finding suggestions.

[Dave M]

Personaly , I would just isolate the power transformer and test it out of circuit , once it is eliminated as a problem work back 


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73     VE3DV , Dave



 

> From: k9mk at flash.net
> To: amps at contesting.com
> Date: Thu, 7 Oct 2010 08:22:41 -0500
> Subject: [Amps] Heath SB1000 blowing fuses, fault finding suggestions.
> 
> 
> I'm working on a SB1000 from an estate that sat idle for maybe a decade,
> and prior to that it had little use. Last known it was working but now it
> is blowing fuses...
> 
> I have pulled both HV secondary wires off the rectifier board and also
> pulled the wires from LV secondary. To be safe I also removed the tube but
> the amp still blows the fuses. 
> 
> As I am working back to the AC plug it's starting to look like the power
> transformer is shorted in some manner. But I have never seen one go bad
> before from "sitting idle". The only other element to isolate is the
> AC-main on-off relay. So I'm thinking that the problem is either a fault in
> the AC Mains relay when it engages or some fault in the power XFMR. 
> 
> Has anyone here chased a similar problem before? Is there a simple way
> to confirm one or the other?
> 
> Thanks in advance for your thoughts and comments.
> 
> 73's Mike K9MK
> 
> 
> 
> 
> 
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