Art,
The HV transformer should have plugs on the primary and secondary
windings. Simply unplug the HV transformer secondary and there will be
no high-voltage.
If my memory serves me correctly, the way I designed it (~5 years ago),
I had one choke was for 160-40m, the other for 20m and above. The switch
that controls the vacuum relay (which switches the chokes) is located on
the bandswitch shaft, between the front panel and the actual RF deck
itself.
I thought there should have been an index hole punched in the front
panel to retain correct sequencing of the selection of anode chokes, but
because the hole would have been visible given the size of the
bandswitch knob, and so my input was ignored/not followed... The
problem is that the anode choke sequencing switch is only held in
position by friction (and the tightness of the corresponding machine
nut). If (when) the nut eventually loosens up, the anode choke
sequencing will be affected...
I no longer have any of my design documentation/notes -- sorry.
Good luck.
Don
On 02/07/2013 03:25 AM, Jim Smith wrote:
Hi Art
I've got a Palstar HF 2500/HF 2500 Magnum owner's manual Rev 2.3 12
Nov 2009.
According to pg. 23, Tuned Input drawing, the plate choke relay is
energized on 10, 15 and 20. Well, it appears to be. The band-switch
wafer which selects the various input networks is nowhere to be found
on the drawings.
I also have Rev 2.4 04 Mar 2010 which I found on the net. Shows the
same thing.
I could send it to you but it's over 6 MB. You should be able to find
it by googling palstar hf2500 manual
Can't help you with the rest of it.
73, Jim`VE7FO
On 2/5/2013 1:57 PM, Sellers wrote:
I was changing bands during a contest recently and didn’t put the
AMP in stby. Well I arced the tune cap.
Nice glob of metal. I replaced the cap with a new one from Oren
Elliott. All went till I tried to tune up on
20,15,and 10. 160,80,and 40 work fine, 1500 watts on them all. On
the upper bands it will only output
500 watts at best.
The final have to RFC chokes, one that covers 160 thru 20 and the
other for 15 and 10. The schematics for this
beast are lacking at the best, built by Palstar, I’m wondering if the
15 and 10 RFC is also enabled on 20, the schematics
show only 15 and 10. Does anyone have experience with 2500 Magnum
and if there is a way to defeat the HV
and get the control circuits operating so as to test the HV RFC relay?
Art W3TZ
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