[Amps] Alpha 9500 Repair

[Kevin Stover]

W6PQL has built a 1KW SSPA for 1.8 though 54MHz using a single 
BLF188XR's. They are dual transistor parts.
He suggests that two such LDMOS parts throttled back to 750W per along 
with his splitter/combiner and LPF board would do the legal limit all 
day, cleanly.

You're going to need a 50V power supply capable of 70A all day.


On 9/15/2015 10:10 AM, Bill Turner wrote:
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Mon, 14 Sep 2015 23:57:41 -0700, you wrote:
>
>> Aside  from that, they really should have designed it,
>> such that components don’t blow up with a simple cathode to grid
>> short, int or hard fault.
>>
>> Jim   VE7RF
> REPLY:
>
> Agreed. Arc protection is a weak point.
>
> I have owned two 9500's. The first one, about four years ago, arced
> when it was a few months old and blew out the 40 volt supply. The
> factory repaired it under warranty and even paid for shipping both
> ways. My second one, a used one less than a year old, has been
> flawless so far, but I see the factory no longer pays shipping if it
> fails under warranty.
>
> I'm hoping Alpha cones out with a brick-on-the-key solid state amp.
> Done right at the right price, that would be a world beater. A pair of
> BLF188XR's costs about a third of an Eimac 8877 and is rated at 2800
> watts PEP. Going with four of them to be conservative would be my
> suggestion and still costs less than an 8877. No warm up, no tuning
> but does need an antenna tuner.
>
> If Alpha is not interested, here's an opportunity for an entrepreneur
> to start a new world class company in their garage. The technology is
> already known, it just takes someone to put it to work.
>
> 73, Bill W6WRT
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-- 
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441