[Amps] What to buy?

[Roger (Sub1)]

On 1/30/2011 2:54 PM, Jeff Blaine wrote:
> Friend of mine has the QRO 2500 with the similar problems on the low end.  Melted toroid mounts.  The amp seems otherwise very
> strong.  Just that toroid tank configuration seems to have a weak spot of some kind that he's not quite got nailed down...

Aren't those tapped toroids?

I would think those things would heat if tapped with the unused turns 
shorted, the wrong mix, insufficient core material, or a mounting that 
would prevent adequate cooling.

73

Roger (K8RI)
> 73, Jeff ACØC
> www.ac0c.com
>
> -----Original Message-----
> From: Jim Thomson
> Sent: Sunday, January 30, 2011 8:11 AM
> To: amps at contesting.com
> Subject: [Amps] What to buy?
>
> Date: Thu, 27 Jan 2011 10:52:00 -0800
> From: "Bill, W6WRT"<dezrat1242 at yahoo.com>
> Subject: Re: [Amps] What to buy?
>
> ORIGINAL MESSAGE:
>
> On Thu, 27 Jan 2011 07:54:39 -1000, leewical at lava.net wrote:
>
>> nothing wrong with a palstar amp.
> REPLY:
>
> Maybe, maybe not. I owned a Command HF-2500 (now taken over by Palstar)
> and twice burned up the plate tank toroid operating full power RTTY on
> 40 meters. Twice!!  $$$
>
> I sold the amp several years ago.
>
> Palstar has improved the design, so they say, and I hope that toroid is
> included. If it isn't, I would not call that a brick-on-the-key 1500
> watt amp. Do your research before you buy.
>
> Other than that one weak spot, I agree, it's a fine amp.
>
> 73, Bill W6WRT
>
> ##  The plastar is a new version of the command technology amp.   It comes
> in 2 x versions.. HF-2500  and HF-2500 magnum. They are both rated for 1.5 kw
> CCS  CXR output .  the ONLY diff is in the plate xfmrs.  33 lbs  vs  44 lbs.  The plane
> jane 2500 uses a doubler.  The magnum uses a FWB.   Both RF decks are 28 lbs.
> $3995.00  VS  $4695.00     $700   more for the 11 lb added weight of the 44 lb xfmr
> seems like a bit much imo.  I paid $1475.00   for  my 253 lb, 16 KVA CCS dahl plate xmfr.
> I also have a smaller  44 lb dahl xmfr... $400.00
>
> http://www.palstar.com/commander_hf-2500export.php    Now u won't find this amp  anywhere
> on their site, nor in their products guide.  I found it with google..so it exists..just no link to it from their site .
>
> ## $6495.00    120 lbs   2.8 kw out.   3 x holer  called a  HF -2500E
>
> All 3 x amps are chockfull of  T-2252B torroids..which are 2.25" OD  x 1" thick.  They stack 3 of em on 160m.  3 of em
> will handle 1.5 kw RTTY  on 160m.
>
>
> Jim
>
>
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