[AMPS] Re: Wanted: 2 X 4CX250r amp article

[Jan-Erik Holm]

>
>John / NS1Z wrote:
>>Somewhere in the dark recesses of my mind I remember seeing an article
>>about a homebrew amp using a pair of 4CX250s (or 150s). Seems to me it was
>>called the plumbers delight or some such. 
>>
>>If any of you kind souls could point me towards a source for construction
>>details, it would be greatly appreciated. 
>
>The Plumber's Special does work, but there are now better designs that
>avoid the problems of lead-screw tuning, and don't blow hot air through
>the tuned circuit. 
>
>If you want a push-pull amplifier, the W1SL design is a favorite because
>it's easier to build than the Plumber's. It was originally published in
>QST for February 1971, and updated into the SSB era in 'The VHF/UHF DX
>Book' (available from ARRL).
>
>Alternatively there's the W2GN parallel design, which was in Ham Radio
>for October 1977.
>
>(Commercial break: Down East Microwave have just taken delivery of kits
>for W2GN-type amplifiers updated to use two 4CX400As. With a 2.5kV power
>supply, they will give 1.0kW output in class AB1.)
>
>73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
>                          'In Practice' columnist for RadCom (RSGB)
>                           http://www.ifwtech.demon.co.uk/g3sek
>
>--
Another design to be considered would be the old YU1AW
design with 3 x 4CX250B, could be found in old DUBUS mag.
Very cheap to build since it doesnt use sockets and also
very easy to build, will put out up to 2500 Watts if you
squeze it a bit.

73, Jim SM2EKM


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