[Amps] Brand new updated PS board for Command Technology amplifiers

[A J]

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 at 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