[Amps] adding second tube to AL1200

[R L Measures]

Kevin -- The stock tank inductances >40m in the Al-1200 are not  
adequate for one 3cx1200A7, much less two.
Doubling the diameter of all  tank L conductors, and halving their uH  
would be a good place to start.  Also, with 2x the circulating  
current in the tank, the dissipation in  the bandswitch contacts  
increases 4x, so a bandswitch cooling fan might be a good idea.
    I did not reply only via Verizon because this item might be of  
interest to amplifier builders.
cheerz

On May 17, 2006, at 12:52 PM, Kevin Adam wrote:

> Wanted information on adding a second tube to AL 1200 has anyone  
> done this if so can you give the details as to what all is envoled  
> what parts you had to change if any please help
> Reply to N9iww At Verizon dot net
>
>
> N9IWW
> Kevin Adam
> 1239 West Till Road
> Fort Wayne, Indiana 46825-2145
>
> http://www.fortwayneradioclub.org
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org