In 2000, My TS-830s allmost kill me due to this problem.
The relay seems have problem and 6146B flash over,when the problems
solved,I made a big mistake, when it power on, I pull the upper cover from
the table, but the cover conected to t the 6146B plate 's cap , my figer was
burned, when I throw away the cover, I found my finger appear a hole.Many years
later, My skin in my finger still with a seam and seem write a bit.
73!Hsu
----- Original Message --
From: "Alek Petkovic" <vk6apk@bigpond.com>
To: <amps@contesting.com>
Sent: Monday, October 18, 2010 3:29 PM
Subject: Re: [Amps] AL1200, high input swr, all bands
> Amplifier input/output relays? Are they making and breaking as they should?
>
> I fixed a AL811 amp once which had the relays cooked. Dunno how they
> do things in the 1200. Knowing Ameritron, it will be just as pathetic.
>
> 73, Alek.
> VK6APK
>
> At 03:05 PM 18/10/2010, Kevin Normoyle wrote:
>> I must have fried something in my AL-1200 and would be interested in
>>thoughts.
>>
>>Details:
>>Was operating on 15M, rtty, when it died. I watch temps with an infrared
>>thermometer so I wasn't expecting to have cooked something. Although,
>>yeah, of course it's a higher duty cycle than typical (high speed fan
>>setting).
>>
>>No obvious smoke. No obvious smoked or cooked parts inside with cursory
>>visual inspection.
>>
>>Amp's HV meter reads normal.
>>No grid or plate current indicated when RF input applied, on any band
>>(with known good plate/load settings).
>>
>>Driving rig indicates infinite swr (all bands). I guess this is the
>>biggest clue.
>>
>>When amp meter is set to ALC, it indicates input RF power which seems
>>okay (tracks rig output power?).
>>
>>I don't see the input pi-network in the AL-1200 schematics, so am not
>>sure what's there.
>>
>>Is there something typical that gets burned out with these symptoms? Or ???
>>I was driving it on 15M with more rf than I need on 80/40/20 for a given
>>output level, but <100W (maybe 75W?)
>>
>>Thanks for any thoughts,
>>Kevin
>>AD6Z
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>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>
>
> http://www.qrz.com/db/vk6apk
> http://www.qrz.com/db/vk6ap
>
>
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