------------ ORIGINAL MESSAGE ------------(may be snipped)
On Sat, 10 Sep 2016 11:14:26 -0400, you wrote:
>
>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.
REPLY:
I don't recall whether my 2000A had the optional fan or not. It's been
gone about two years now. It might not have.
I was surprised at your comments on the 9500 fan and relay noise. My
9500 sits about two feet from my right ear and both the fan and relays
are completely inaudible. Apparently a production change was put in
place at some time. Mine was manufactured in October 2014. In fact
when I first got it I was surprised at the lack of relay noise so I
pulled out the schematic to see if maybe it had pin diodes, but the
schematic shows relays. Don't know how they found such quiet relays,
but they did.
Of course, the schematic could be wrong.
73, Bill W6WRT
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