[Amps] Acom 2000A - typical output power?

[MU 4CX250B]

The Alpha 9500 comes with somewhat noisy Gigavac vacuum relays. It's
very easy to retrofit them with Jennings RJ1a relays, which are very
quiet, have no contact bounce, and are faster. Ive done the conversion
and am very pleased with it.
73,
Jim w8zr

Sent from my iPhone

> On Sep 14, 2016, at 11:19 AM, Jim Thomson <jim.thom at telus.net> wrote:
>
> Date: Sat, 10 Sep 2016 11:14:26 -0400
> From: "Paul Christensen" <w9ac at arrl.net>
> To: <amps at contesting.com>
> Subject: Re: [Amps] Acom 2000A - typical output power?
>
>> "I owned a 2000A at one time not to mention many other amps over the years.
> If you run it at 1500 watts RTTY contesting, it will over heat after a
> while, about 10-15 minutes as I recall."
>
> Bill, was that with or without the externally-mounted muffin fan as an
> assist to the blower?   My 2000A was purchased in 1999 and the fan was an
> option at the time.  It was probably standard equipment in later models.
> During my 12 months of ownership, the 2000A was never used on RTTY -- so you
> bring up a good point.
>
> There's an Alpha 9500 at a remote internet site owned by myself and N4CC.
> It's a great amp for this purpose.  We use the internal RF switch as an
> antenna selector and AlphaMax mostly keeps tuning where it should be
> although from time-to-time, we see a lot of "hunting."  However, it's an amp
> I would not have on my home desktop: too much blower noise and the T/R
> relays are ridiculously loud.  My 2000A was very quiet in operation although
> perhaps that may be one reason why it's sub-par on RTTY.
>
> Paul, W9AC.
>
> ##  I though the 9500 used small RJ1-A  type  vac relays ???   Those things
> are not loud.   If shock mounted you cant even hear em.   If they use one vac
> realy on the output side..and a reed relay on the input side, that too would be
> quiet..or should be.   The blower noise is another matter.  I think on the ameritron
> 8877 amps, the fan speed can be wired for several different speeds.   Of course,
> for  rtty contesting,  the blower is  gonna make a lot of noise.   If the 9500 blower
> is one speed,  full bore, the best you could do is perhaps relocate the amp, or
> place sound deadening material  around it.
>
> ##  for  1.5 kw out, you require  2.5 kw input..assuming 60% eff.  Thats 1 kw CCS
> of diss..which is a bunch.
>
> Jim   VE7RF
>
>
>
>
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