The last SB-1000 that I worked on had a shorted plate transformer. So it's
not unusual. Ameritron has replacements with instructions. The replacement
is not a wire for wire replacement.
73
Jim W7RY
--------------------------------------------------
From: "Mike & Becca Krzystyniak" <k9mk@flash.net>
Sent: Thursday, October 07, 2010 6:22 AM
To: <amps@contesting.com>
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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