[Amps] Clipperton-L question

[Carl]

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 at nc.rr.com>
To: <amps at 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 at 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 at nc.rr.com>
> To: <amps at 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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