[AMRadio] Ranger Audio... the numbers

Rick Brashear rickbras at airmail.net
Fri Nov 17 12:44:57 EST 2006

Switch SW4b connects the resistor to the screens of the modulator tubes 
when in the "Phone" mode, so it is the "modulator Screen" adjustment.  
It also plays a role in the screen voltage of the 6146 final.  Ideally, 
if the modulator idling current is correct the screen voltage on the 
final will also be correct.  If this is not the case you might 
troubleshoot that particular area.  This is my understanding, can 
someone else can shed more light on that situation.


Jack Schmidling wrote:

> Rick Brashear wrote:
>> Jack,
>> The adjustable resistor (R35) has a direct affect on the screen of 
>> the 6146, so that is normal if the clamper (V6) is performing correctly.
> Then why is is called the "modulator screen voltage adjustment" on the 
> schematic and used to adjust the mod current?
> > You may have to
>> adjust R35 to get the needed screen voltage on the 6146.
> But that would conflict with adjusting it produce the appropriate 
> modulator current.... no?
> js

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