check your power supply diodes. Simple task with a VOM on diode check mode.
If that is OK then remove all the tubes and try again. If fuse does not blow
then you have at least one bad tube. Look closely for HV arcs to ground.
Check the safety choke. That is what you need tgo check.
-----Original Message-----
From: Larry <lknain@nc.rr.com>
To: amps <amps@contesting.com>
Sent: Wed, Sep 11, 2013 7:37 pm
Subject: [Amps] Clipperton-L question
One day when I switched from CW to SSB mode on my Clipperton-L it blew the fuse
with a good bang. The switch picks between a tap and one side of the power
transformer secondary – tap being for CW. I forget but for SSB I think the
power
supply supplies 2500V(+/-) and somewhere around 2000V(+/-) for CW. Nothing
obviously wrong that I could see with just the covers off. I replaced the fuse
and as soon as I turned the amp on it blew the fuse again. I searched the web
to
see if someone had seen this problem before and had written about it but I
didn’t find anything. I have had the amp since it was new (1984?) but I put a
Harbach power supply board in it about 2 years ago. As a long shot I thought I
might ask here if anyone had seen a similar problem before I try to
troubleshoot
this.
73, Larry W6NWS
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