[AMRadio] Re - response to input to screen grid amplifier


Edward B Richards zuu6k at juno.com
Tue May 23 18:25:13 EDT 2006


If it ain't broke, don't fix it.

73, Ed Richards K6UUZ
Simi Valley, Ca 93065
Home of the Air Force 1 pavilion

On Tue, 23 May 2006 14:04:19 -0700 (PDT) Bill Fondren
<bill.fondren at sbcglobal.net> writes:
> Thanks for the quick response to my questions concerning this amp.   
> John, I was ready for some salty remarks (hihi)  and I did clean my 
> glasses and take a second or third look at the thing.  I thought I 
> had missed something since going to USAF Radio School in the early 
> 50's. Guess that tells u why I mess with vacumn tube rigs.  Anyway 
> thought I better get some expert opinions before starting to cut and 
> chop to get it to a more conventional type.  The construction of the 
> amp is above average for a homebrew rig.  A couple of other things   
>   There is a RFC choke  coming off the G1 connections going to the 
> 10K resistor then to the grid meter (0-30ma shunted with a 50 ohm 10 
> watt resistor)  It does read about half scale peaking normal as u 
> tune the grid circuit. Also a .01 bypass cap at the meter.  The 
> input coil is grounded in the middle through a RFC choke making a 
> double coil, tuned by a split stator cap. One of the tuned circuits 
> goes directly to the screen grids and the
>  other feeds the neutralizing voltage back to the input from the 
> plate. No bias circuits of any kind. The few times I used it I got 
> good reports using a Elmac AF-67 exciter.   Will probably change it 
> to a more conventional type.   Thanks again     Bill  K5PML
> 
>    
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