[AMPS] AL-1200 Blower

[measures]

>
>Just installed a new AL-1200 yesterday.
>
>The blower is kinda loud, like sitting in the back row of a DC-9 with full 
>reverse thrusters.
>
>I notice the blower has wiring options for 4 speeds (it comes wired for 
>3rd gear).
>
>Has anyone rewired for lower speeds and used the amp for contesting?  
>
>I'm thinking about finding a 4-pos rotary switch and mounting it (drill a 
>hole in my new amp - GULP!) on the rear panel so I can switch blower 
>speeds depending on usage.  Anyone done that?  
>...
As I understand it, the AL-1200 needs:
an addional cooling fan directed at the bandswitch.  
additional HV bypass (1000pF @ 1.8MHz is not enough)
a glitch R.  
remove the "neutralization" circuit.  Over 35 years ago, Heathkit and 
Gonset unsuccessfully tried "neutralization" of a g-g amplifier.    

cheers,  Hans

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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