[Amps] Different amp recommendations
jim.thom at telus.net
Thu Feb 9 07:23:41 PST 2012
Date: Wed, 8 Feb 2012 16:14:12 -0500
From: "Carl" <km1h at jeremy.mv.com>
Subject: Re: [Amps] Different amp recommendations
Check Palstar and QRO, dont know what their specs are but a 3 holer "export"
model should do it.
## palstar is now commander. the HF-2500E has 3 x 3CPX-800A7's in it... but it uses the same HV supply !
It will do 3.5 kw out, but the xfmr is maxed to the peg, and then some. the 3 holer qro and commander can't be sold in the
## the QRO 3 x holer uses 3 x russian GU-74's [ '4cx-800']. The damn thing sucks 675 ma on idle = blast furnace.
225 ma per tube. [450 ma for the 2 x holer].
## the new commander uses 3 x Eimac 3CPX-800A7's which is a heck of a LOT of $$ to re-tube the amp.
## Nothing wrong with the AL-1500/1200/ AL-82. they will run 2 kw out all night long, a buddy does just that every night
on ssb. In a rtty contest, ur not on TX all the time..so duty cycle is down quite a bit. Just crank up the fan speed to max
on those amps.....if using rtty..and maybe back off on the power..like down to 1.2 kw
## as for the 91b having the HV + fil winding on the same xfmr...IMO, that's more fubar engineering. That's the
dumbest thing u can do, it causes more grief than u can imagine. The fil xfmr should be separate. The fil xfmr could
contain low V control stuff..like for relays etc... and that's it.
later... Jim VE7RF
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