recommendation needed for 6M amp design

[Don Roden]

The 4CX250 is a sweet tube for six meters.

You can run one, or if you have a big power supply, you can run four.

I have an old Johnson 6N2 Thunderbolt that will loaf along at 1KW CW out
using two tubes.


I like un-tuned inputs with swamping resistors. If I remember  
correctly, you need to make about 150 volts of voltage on the grids.   
I built one that used a 200 ohm 100 watt heat sinked chip resistor and  
a broadband 1:4 torriod transformer to handle a 50-100 watt driver.

If you need more gain, 10 watts with a tuned input will do great.
20 watts with more resistor loading will help insure stability.

I asked Bill Orr about the air requirements once, and he told me to  
use a blower large enough to pop the tubes out of their sockets, and  
then back off just a little...............  they are happiest with  
lots of cooling.

Don WA4NPL





Quoting "Michael Tortorella" <w2iy at VERIZON.NET>:

> Greetings to the list,
>
> I am contemplating building a 6 meter amplifier using 4CX250 tube(s).  Does
> anyone have a recommendation for a design that's already been worked out?
> Opinions welcome.
>
> Thanks and 73
>
> Mike W2IY
>
>
>
>
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