Funny you mention the Yokogawa. I bought one as a project amp a few yrs
back from Mark Ke9pq. If you have never checked out his site he has neat
stuff for sale. Google his call for his website. Anyways, I still have
the Yokogawa. It is at that point where I restore it to operational
status as an HL2K (which it really is) or continue to use it for parts.
It has a very robust tank ckt that is professionally done, stuff you
don't see very often anymore except for maybe the high end Command amps
and the like. The original plate xmfr was fried and was like that when I
bought it, disclosed prior to sale. For now it just sits on the shelf
waiting for a future project to begin. Thought abt making it a 160
monobander too, maybe some day.
Lane
Ku7i
-----Original Message-----
From: Carl [mailto:km1h@jeremy.mv.com]
Sent: Tuesday, March 23, 2010 3:14 PM
To: Zeitler, Lane LT, FST-1; Amps@contesting.com
Subject: Re: [Amps] B&W PT-2500A HF Amplifier
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@cpr3.navy.mil>
To: "Carl" <km1h@jeremy.mv.com>; <Gary@ka1j.com>; <Amps@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@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of Carl
Sent: Tuesday, March 23, 2010 12:08 PM
To: Gary@ka1j.com; Amps@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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