Read the 9500 adverts and see how they tell you what went wrong with the
87a..... Adverts say no more PINs and vy few plugs and sockets.
Same as StepIR adverts that NOW stress quality improvements and a new hi
quality guy there. Tells you that the prior antennas were fraught with
problems of quality parts.
Watch what car makers say is "now improved" to learn what was wrong with
earlier models, hee hee hee.
87a built-in flaws do not show up in early ownership of new ones, but wait a
few years, ah ha gotcha.
PS, the only way you can baby your amps or radios is to adjust them out of
spec. Otherwise, contest ops, continuous Diathermy use, or otherwise do not
wear out your cuddly electronic things. Tubes do seem to wear out eventually,
but no one yet has told me how that happens, but one guy did say that they just
run out of electrons, oops. Band switches are mechanical and will wear out
eventually.
Charles Harpole
k4vud@hotmail.com
----------------------------------------
> From: perry@willbell.com
> To: Amps@contesting.com
> Date: Mon, 9 Jul 2012 23:19:52 -0400
> Subject: Re: [Amps] Alpha 87A
>
> I have an Alpha 87A circa 1999-2000 bought new. It just chugs along but I am
> not a contester and for the most part I feed resonant antennas.
>
> 73
> Perry W1COW
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of GeorgeWallner
> Sent: Monday, July 09, 2012 10:59 PM
> To: David Jordan; Kurtis Burton; amps@contesting.com
> Subject: Re: [Amps] Alpha 87A
>
> "David Jordan" <wa3gin@comcast.net> wrote:
> > Sounds about right. The older units need significant modifications to
> >bring them up to current.
> I have a 1993 vintage Alpha 87A. The only problems I had were with the T/R
> switching PIN diodes (DPX-X103), which I had to replace three times so far.
> The amp is getting about 50 hours of use per year, but most of that is in
> costests, where it runs hard for 48 hours. The tubes are still original and
> I get about 2000 W out with roughly 50 W drive (band dependent). As an amp
> it meets my expectations (for a tube type amp) and I really can not see what
> upgrades would justify $3000!
>
> George
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