>On Fri, 10 Oct 2003 21:40:48 -0700, Dana Roode <K6NR@ARRL.net> wrote:
>
>>A question for those with AL-1200 repair experience --
>>
>>I bought a used AL-1200 amp a few months ago - it has a low serial number,
>>108, so I assume its pretty old. I have used it in several contests and it
>>has been working well.
>>
>>This weekend we were using it in the California QSO party when there was a
>>loud pop and an arc visible from the side venting holes, perhaps near the
>>filter capacitor and rectifier boards. The Icom 756 PRo II I was driving it
>>with went south at the same time - no transmit power (received everything
>>else was fine). The Pro II is headed back to Icom for repairs.
>
>_________________________________________________________
>
>I had a similar experience with my AL-1200 which I bought when they
>first came out. In fact, it happened twice.
>
>In the first case, I was running RTTY in a contest and the tank coil
>overheated. ...
? I have heard reports of this too. It seems to me that the diameter of
the conductors selected for Ameritron tank inductors needs to be greater
in order to reduce I^2 x R loss. Also, adding a cooling fan directed at
the tank L and the bandswitch would help. . . . This is one thing Heath
got right in the SB-220.
- R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org
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