[Amps] B&W PT-2500A HF Amplifier

[Dwayne]

----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Zeitler, Lane LT, FST-1" <zeitlel at cpr3.navy.mil>; <Amps at contesting.com>
Sent: Tuesday, March 23, 2010 4:14 PM
Subject: Re: [Amps] B&W PT-2500A HF Amplifier
Carl....
  The PT-2500a   Viewstar  Always had the Mod #86 band switch.. I've had a 
number of these amps here and that band switch was common befors B&W ever 
got it... As well the pi-L tank circuit was never a problem..  What was a 
problem was that Potter es Brumfield relay timing..  I still have two of 
these amps and the only mod I've done is a QSK circuit for c.w.  Oh and the 
changes B&W made had nothing to do with inproveing  the amp. like the" 
transformer" change..
       Dwayne   Ve6qx

> Yep, Ive seen those in person. The B&W used a massive RSC (now Multi Tech
> Industries) Model 86 switch, chimneys, and a healthy transformer.
> 160-10M and 1800-2000W out on all bands. I sold about 20-25 as a 
> distributor
> and had a pair of very early models that I did the redesign work on as
> loaners for a few years of contesting.
>
> There is also the Yokagawa P9306 industrial amp that many have converted.
>
> Carl
> KM1H
>
>
>
>
> ----- Original Message ----- 
> From: "Zeitler, Lane LT, FST-1" <zeitlel at cpr3.navy.mil>
> To: "Carl" <km1h at jeremy.mv.com>; <Gary at ka1j.com>; <Amps at contesting.com>
> Sent: Tuesday, March 23, 2010 7:04 PM
> Subject: RE: [Amps] B&W PT-2500A HF Amplifier
>
>
> Sigma made a 3-500Z amp in the late 70's/early 80's that was very well
> done. They apparently did not import many to the states b/c you rarely
> see them for sale. I had one about 15 yrs ago, the weak link was the
> bandswitch. It was also an absolute nightmare to service.
>
> Tokyo-Hy Power used to make a "HL2K" that ran a pair of 3-500Zs. It too
> was very well done. Not very easy to service either.
>
> Lane
> Ku7i
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On Behalf Of Carl
> Sent: Tuesday, March 23, 2010 12:08 PM
> To: Gary at ka1j.com; Amps at contesting.com
> Subject: Re: [Amps] B&W PT-2500A HF Amplifier
>
> Viewstar was Hammond and since they couldnt crack the US market they
> approached B&W.
>
> The Pi-L tank had a few problems causing lots of smoke and that was
> redone.
> Its the best of the 3-500 amps but its high price limited sales and it
> was
> discontinued.
>
> Carl
> KM1H
>
>
>> Tony,
>>
>> I gave my Dad what I believe was the original version of that Amp,
>> the Viewstar PT-2500A made in Scarsborough, Ontario. He uses it
>> daily. I've been so wrong before but I think B&W bought the amp
>> design from Viewstar.
>>
>> If you can scan those pages I'd like a copy of them myself.
>>
>> Thanks,
>>
>> Gary
>> KA1j
>>
>>> Cleaning out here and came across the "73 Magazine" review of the
> above
>>> amplifier (3 pages).  If you have this amp and would like this
> original
>>> copy review, I'll be happy to send it along to you.
>>> 73
>>> Tony, W4FOA
>>>
>>>
>>> Watch your thoughts; they become words.
>>> Watch your words; they become actions.
>>> Watch your actions; they become habits.
>>> Watch your habits; they become character.
>>> Watch your character; it becomes your destiny.
>>>
>>>                             -Frank Outlaw
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>>
>>
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