[Amps] orphan amp?

[Barry Kirkwood]

In my experience, high band arcing does not occur if the unit is tuned 
correctly.
The Pi-L needs more precise tuning than the Pi.
If the thing is set up into a dummy load, and then set to the logged 
settings before fine tuning into normal antenna loads then there is no 
problem.
73
Barry

end
Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
ph/fax 64-9-372-5161
www.waiheke.co.nz/signal.htm
----- Original Message ----- 
From: "David A. Pruett" <k8cc at comcast.net>
To: "carl seyersdahl" <carlseye at tampabay.rr.com>
Cc: <amps at contesting.com>
Sent: Saturday, October 09, 2004 9:07 PM
Subject: Re: [Amps] orphan amp?


>I own a PT-2500A.  My buddy bought the demo unit at the Dayton Hamvention 
>in 1984.  They sold it cheap rather than carry it back.
>
> My understanding was that Viewstar was own by Tom Hammond, the same Tom 
> Hammond of Hammond transformer company.  The design was eventually bought 
> by B&W, who kept the same model number.  The only difference that I'm 
> aware of is that they deleted an area of black paint on the front panel.
>
> Viewstar disappeared a long time ago, although I believe Hammond 
> transformer is still around.  B&W might be a place for parts.
>
> I've owned mine since 1989.  When I first got it, there was some high-band 
> arcing in the bandswitch.  My solution was to devote it to 160M where it 
> has generated a lot of big contest scores.  Yes, the T/R relay is slow and 
> it clunks.  Also, the relay keying voltage is 120 VDC (not a typo).  I 
> added my own soft-keying with $10 of part from Radio Shack.
>
> It still easily makes legal limit on 160M with 100W drive going through a 
> W3NQN bandpass filter.  This is with the original 1984 Eimac 3-500Zs.
>
> It might not be the best amp on the planet, but it's done a good job for 
> me.
>
> Dave/K8CC
>
> At 07:23 PM 10/7/04 -0400, you wrote:
>>   Can anyone here identify an amp built by B&W
>>     model PT-2500-A ??? A friend of mine has one he got for peanuts, it 
>> has
>>2 3-500s , one of which is bad, the meter is bad and who knows what else
>>might be wrong, but he needs the manual and all help he can get.!!
>>    I will help him as much as I can , but he lives 150 miles from me so 
>> it
>>isn't easy. Any help will be appreciated.!!
>>     carl / kz5ca
>>
>>
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>
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