[NJARC] GLORITONE RADIO

[Jim Whartenby]

Greetings Al
Majestic models 60, 70, 72, 80, 90, 100, 130, 180, 181 all appear to
have the same field coil / resistor voltage divider.  I'm working on a
Model 90 that needs a power supply so I have been looking into this. 
Must have been the thing to do back in the early 1930s.  Or perhaps
there is a connection between US Radio and Grigsby-Grunow?
Regards,
Jim


--- Al Klase <al at ar88.net> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Hi Aaron and John,
> 
> I've been "reading the mail" on this one.  This is a pretty unusual 
> setup.  The speaker field coil is NOT used as a choke in the power 
> supply like you'd usually expect, but is connected between B+ and the
> 
> 2640 ohm resistor to ground.  The speaker field has an unusually high
> 
> value of  11,700 ohms, plus it's tapped to provide screen voltage for
> 
> the first two RF amps.  You're probably not going to find a speaker
> like 
> that lying around.  If anyone else is reading along, see:  
> http://www.nostalgiaair.org/Resources/708/M0040708.htm
> 
> I'd install a permanent magnet speaker of the appropriate size, and 
> replace the field coil with resistors of approximately 9000 ohms (10 
> watts) and 2600 ohms.(5 watts).  Look like the output transformer was
> 
> attached to the original speaker.  If you have to replace, it should
> be 
> about 7000 ohms to 8 ohms.
> 
> Regards,
> Al