[Amps] Arcos 2M Amp Built by W2GN

[Jerry Muller]

I have two ARCOS amplifiers. A 432 amp that Fred built and a 2 meter amp 
that I built from one of Fred's kits. Both of my amps use 8930s (a 350 watt 
dissipation tetrode that is similar to a 4CX250). I converted the 432 model 
from 4CX250 to the 8930. Both amplifiers work fine. I made EME contacts with 
both amps when I used to have them on the air.

I second that Fred was a fine craftsman. He took no shortcuts and made 
quality products. I did not know that he made a version using the 3CX800 but 
I'm sure it's a fine product. The original design for the 432 amp was by 
K2RIW and was published in QST some time in the middle of 1972 if memory 
serves me correctly. The 432 version uses a half wave stripline and the 2 
meter version uses a quarter wave stripline.

If Fred built it, the amp will be a cherry.

73 es gl with the amp, Jerry

----- Original Message ----- 
From: "Joe Giacobello" <k2xx at swva.net>
To: <amps at contesting.com>
Sent: Friday, June 03, 2005 2:12 PM
Subject: [Amps] Arcos 2M Amp Built by W2GN


>I have an opportunity to pick up an Arcos 2M Amp built by W2GN in the
> 80's.  It uses a pair of 3CX800's for 1.5 KW output.  It also has  a
> dual channel Bird wattmeter for simultaneous measurement of forward and
> reflected power.  I have been told that these amps were of the highest
> quality and that the builder was a grade A craftsman who also built
> similar amps for commercial applications.  Frankly, I have not seen this
> amp in the flesh and I'm also relatively inexperienced with high power
> VHF/UHF amps.  I would appreciate any input or insights that any of you
> might have on this prospective purchase.
>
> Thanks.
>
> 73, Joe
> K2XX
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