[Boatanchors] Trying to identify the origination of a real nice heavy PA tuning deck

[Bill Cromwell]

Hi Bill,

Is this a typo? I tried looking up the specs for a 4CX150 to refresh my 
memory - looked into buying/using 4X150, 4X250, and 4CX250 tubes in the 
past. One place specifically says there was never a 4CX150 model and I 
cannot find specs anywhere for that model. A pair 4X150 with adequate 
blowers can make about 600 watts RF output all in. That is not 
insignificant. Places like Fair Radio used to sell a PA pull from 
retired military gear. For ham operation an output network would be 
required as you have described. My thoughts were to use it with 4CX250 
tubes - capable of more power output (but still not 2KW). I think the 
one I looked at included the 4CX250 tubes.

The parts you describe in the add-on output section being heavier than 
needed is something I do. Overbuild everything. I once built a 6146 PA 
as boots for QRP transceiver (Ten Tec Argonaut). The power supply (and 
everything were far above the minimum requirements. A resistor broke in 
the bias supply and the dish ran away with the spoon. The cow jumped 
over the moon. The 6146 melted in short order and finally the fuse blew. 
At no time did the power supply hum, buzz, moan, or groan. It looks like 
somebody added insurance to that output section. Good luck and have fun 
with your find.

Happy New Year and...

73,

Bill  KU8H

On 12/30/2016 01:10 PM, Bill Mellema via Boatanchors wrote:
>   Guys,
> I recently found a partially built homebrew 2X 4CX150 ham PA amplifier. The PA tuning is a separate section that can be removed with a few screws. It is built like a tank and can easily handle 2KW with the very heavy hardware and switch contacts. The PA section is definitely commercial not homebrew. I would like to find out if it was sold as a single assembly or pulled from another ham amplifier. The assembly contains ALL of the output PI network, tank switching and loading capacitors. The load capacitors are on a pinion driven rail that actually controls two caps at the same time. If anyone can thinks they may be able to help me I can send pictures. Please contact me direct.
> Thanks In Advance,
> Bill N3WM   n3wm at yahoo.com
>
>
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
bark less - wag more