[Amps] Clipperton-L question

[Richard Solomon]

I actually had to check the schematic ... I couldn't believe they switch
the
HV side of the Xfmr, but they do.

That's a terrible design.

73, Dick, W1KSZ


On Wed, Sep 11, 2013 at 5:47 PM, Larry <lknain at nc.rr.com> wrote:

> 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 at 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 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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