[TTech]

Came across An Atwater Kent model 20 big box and brought it home a couple weeks ago. Will be oldest radio I've worked on yet. First battery powered radio also. It has all it's tubes, all the filaments check good. One audio transformer missing, other audio transformer, open primary. Replaced one open grid resistor and one condenser looks bad. Going to take it slow and work on it when I get tired of other projects. But I do have a couple of questions to anyone that has experience on this type of radio.

1. When the variable condenser / tuning gang knobs are set at zero, what should be the position of the plates? Number 1 is approximately 80% closed. While number 2 is approximately 35% open, number 3 knob 45% open. I was expecting all three to be the same. I took #1 knob off and could find no alignment mark, all 3 knobs can be secured any where on tuning gang shaft. 

In the future when I fire it up and want to see if I can tune the radio to my sig gen putting out 454.3 wave lengths. According to the dial setting chart my 1st dial should be set at 62, #2 dial at 63, and #3 dial at 63. If the dials are not in the correct position in relationship with the plates, my dial position becomes unknown. Would like to solve this if I can. Unknown radio operation status plus unknown radio dial position could lead to a frustrating afternoon.

2. Speaker that came with with the radio has the name Perfectone on it. Horn has no curves and stands straight in the base. Measures 23" from bottom of base to top of the horn. Audio coils are good and can hear static when leads are tapped across a 9 volt battery. Have been able to find no information on this name of speaker. Any info or reference to a web site would be appreciated.   


     Thanks

     Tim