You are correct that the transformer leads are always hot. One side of the
HV winding is always connected and the switch selects the other side of HV
secondary or a tap on the HV secondary.
If there are no arc points I will probably look at the PS first.
73, Larry W6NWS
-----Original Message-----
From: Carl
Sent: Wednesday, September 11, 2013 8:24 PM
To: Larry ; amps@contesting.com
Subject: Re: [Amps] Clipperton-L question
I dont see how it can be the transformer since all 3 HV leads are always
"hot" and the fuse only blows in SSB.
Something on the PS board could be the problem and all that is easy enough
to test.
Carl
KM1H
----- Original Message -----
From: "Larry" <lknain@nc.rr.com>
To: <amps@contesting.com>
Sent: Wednesday, September 11, 2013 4:34 PM
Subject: Re: [Amps] Clipperton-L question
Thanks guys for the input.
I looked at the switch and it didn't have any obvious problems but I
figured a better inspection is required.
Disconnecting the transformer leads was on my list as well. A new
transformer is about $300 unless I can find a used one that still works.
It also looks like a bear to get out.
The filter caps are only a couple years old which doesn't guarantee that
they are still good of course. I had a Henry 1KD5 years ago that blew a
cap within a year. A bit more spectacular than this one. The Henry arced
through a 0.25 inch phenolic board among other things and didn't blow a
fuse!
Since I had replaced the power supply board I thought maybe there was a
wire I didn't get on correctly and when I turned the switch it finally
moved enough to short or arc. I didn't see any obvious arc sites or wires
out of place which is why I sacrificed another fuse.
-----Original Message-----
From: Carl
Sent: Wednesday, September 11, 2013 2:58 PM
To: Larry ; amps@contesting.com
Subject: Re: [Amps] Clipperton-L question
Id check the SSB/CW switch carefully for arcing to a metal part. Common
problem with an underated switch.
Carl
KM1H
----- Original Message -----
From: "Larry" <lknain@nc.rr.com>
To: <amps@contesting.com>
Sent: Wednesday, September 11, 2013 2:43 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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