The Alpha's amplifier is the first modern amplifier from the West what I seen
in 1995 Beijing DX convention( I just get the amateur radio licence in 1994 .
)It is amazing amplifier.I still keep the photo with the Alpha's engineer( CEO
?)and WU6D in Beijing. I do know about modern tube amplifier at all in 1995.
73!Hsu
----- Original Message -----
From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Sent: Monday, January 03, 2011 10:07 PM
Subject: Re: [Amps] 87a Fault 9
>> I have been plagued for years with my 87a giving Fault 9. Been back to
>> the clowns at Alpha several times for same problem. The 87a may be
>> Alpha's big mistake in their line. Piece of junk.
>
> I think that's a bit harsh, Chuck. There are many 20 year-old, problem-free
> 87As performing very well on the bands every day. There's a reason why it's
> faulting and it's a matter of uncovering the root problem. It's easy to
> say that there's a design flaw when it's you that has the burden of
> isolating a persistent problem.
>
> By now, you know the fault is relates to "transmit PIN diode forward current
> below minimum." But, the problem may be indirectly related to something
> like the LV power supply or arcing on a wiring harness, for example.
>
> I know that Alpha has the means to isolate these types of faults, including
> quick component and/or board substitutions. Since it's been back to them
> several times, is it an intermittent fault, occurring only occasionally?
>
> Paul, W9AC
>
>
>
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