[Amps] Alpha Amplifier

[Hsu]

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 at arrl.net>
To: <amps at 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
> 
> 
> 
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps