Date: Fri, 24 Nov 2017 09:35:30 -0500
From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Subject: Re: [Amps] 9500 amp.
< An Elecraft KPA1500 is on order and will replace both amps. The benefit for
us:
- Fast, PIN Diode T/R switching;
- Distribution of weight; PS will rest on the floor and give us much more
desk space with just one solid-state RF deck;
- One amp instead of two handles 160m-6m;
- Native Ethernet connectivity;
- instant on;
- Almost no power consumption in standby; Today, we leave the amps running
with filaments on, then place in operate mode after remote site log-in is
complete.
Paul, W9AC
## leaving the fil on the 8877 tube in the 9500 means excess wear and tear on
the tube itself.
Anytime the fil is lit.... the clock is ticking. 24 x 365 = 8760 hrs.
Thats a lotta fil hours
per year on the tube. Dunno how long the fil is good for in the chinese
8877s ? Thats also
8760 hrs on the blower and everything else in the 9500 amp. My guess is
perhaps 3-4
years max, before the emission drops off. Is the tube protected if the blower
goes dead ?
## For your remote operation, the new KPA-1500 is probably the ticket, covers
160-6m,
instant on etc. As long as its reliable, it should work out good, and greatly
simplify things.
## Dunno why amp makers just dont use a GH1-RJ1A on both the input..and output
of an amp,
IF they are going to use vac relays. Then the amp will easily handle 1.5 kw
when on bypass mode....
in the case where you string 2 x amps in series, nose to tail. I string 4 x
L4Bs nose to tail, all in series,
then tune em up on different bands, or say 80m cw and 75m ssb, etc. Simplifies
not having to switch
anything at all. A simple rotary switch ensures that only one amp can be
keyed at any one time. Key
line from xcvr goes to com on rotary switch. Outputs of rotary switch feed the
key line input to each amp.
Simple mech interlock.
## Even 2 x SS amps could be wired nose to tail, with a simple relay switched
key line. 2 x amps
would ensure redundancy if the amp function was crucial, or perhaps if remote
operation was used,
and remote site was not easily accessible in inclement WX.
Jim VE7RF
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