I had a Palstar 2500E (3X3CPX800A7) IIRC Paul told me only 6 were made,
regrettably sold. No idea how many non E version.
Many changes were made the power supply it was accessible from a
removable bottom panel. An issue with the transformer leads would become
loose after about 6-8 months and needed to be re-tightened from the air/
blower vibration. The transformer was also much larger in the Palstar.
The control circuit was also very fast acting, over grid trip, over
plate trip etc.
No more festoonbulbs !
The qsk was a bit noisy ( personal opinion).
Step start used mechanical relays vs the crydom electronic.
RF deck layout very similar.
The Palstar 2500E was significantly taller over the Commander 2500E
Output was ~4400 into the dummy load, lots of overhead.
Cheers AJ___ VE3HJ
On 1/21/24 08:17, gudguyham--- via Amps wrote:
Alek, when Kessler took over Commander from Pat Stein he teamed with Palstar and that was a
welcomed change that he made. Unfortunately with only one run of amps made it’s
anyone’s guest if with the abundance of control changes if any flaws were made there.
Sent from the all new AOL app for iOS
On Sunday, January 21, 2024, 6:56 AM, Aleksandar Petkovic via
Amps<amps@contesting.com> wrote:
Yeah, it is a bit of a pain to get to the HV parts but not too bad.
Phil, VK6GX cut the bottom out of his amp where the parts live while he
had everything apart. He made a new cover plate and now has very simple
access to the power supply.
I was going to do the same to my amp but decided that the amp would
outlive me after I had changed the HV components, so I left it as is.
I actually opened it up again a year later because I bought one of
W8JI's blowers to replace the sick one which was really noisy . . . . .
and I still didn't modify the bottom.
Slow learner.🙂
73, Alek VK6APK.
On 21/01/2024 2:44 am, Rob Atkinson wrote:
Sounds like the kind of problem that develops with table top ham gear
that's crammed into a too small cabinet.
Several years ago a friend of mine and I got into a Command amp that a
mutual friend brought to us for repair. It was the model that had a
single 3cx800 on HF. It turned out to be okay (some kind of operator
error) but we spent enough time on it to take in how it was made, with
the inaccessibility of the power supply area (caps and diodes). That
part of the amp sat in a shield, underneath the band switch and output
network, and had no access panel on the underside of the cabinet.
When we got it back together I told the owner to unload it ASAP
because if a diode or filter cap ever crapped out, the bench time
needed to get to the power supply and reassemble would make the repair
four or five times more expensive than it needed to be.
73
Rob
K5UJ
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Knowledge is Power and Power is Knowledge.___AJ___1967
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