[AMRadio] need help


Edward B Richards zuu6k at juno.com
Wed Oct 19 12:54:14 EDT 2005


Thanks, Ed. I actually have not built it yet. Still in the design stage.
It will be a Heathkit KL-1 clone. 3kv on the plates.

73, Ed K6UUZ

On Wed, 19 Oct 2005 15:45:50 +0000 <esieb at sympatico.ca> writes:
> I'd have used an MFJ 259B to actually measure the input Z.  
> Alternatively, 
> you  can always use a  small tuner to "tune" the input.  I do that 
> anyway 
> with my Drake L4B, (use a small MFJ mobile tuner with meter).
> 
> 4-400's, eh?  Nice amp!  If your plate voltage is high enough, you 
> ought to 
> get serious power out of that baby!
> 
> 73, Ed, VA3ES
> 
> 
> From: Edward B Richards <zuu6k at juno.com>:
> 
> I want to drive a linear amplifier with a rice box that requires a 
> 50 ohm 
> load.
> The linear amp uses an input to a 170 ohm, 80 watt swamping resistor 
> to 
> ground, then
> through a .001 mfd capacitor, then through a VHF parasitic 
> suppressor
> consisting of  4 turns of wire around a 47 ohm resistor, to the 
> grids of
> a pair of parallel connected 4-400A tubes.
> 
> What I need to know is the impedance of the input. Is it close to 50 
> ohms
> or do I need to use a matching network between the rice box and the
> linear amplifier.
> 
> 
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