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The {{Title|General Radio 107 Series of Variable Inductors}} were introduced in {{Catalog A}} and certain models remained available through {{Catalog T}}.  
The {{Title|General Radio 107 Series of Variable Inductors}} were introduced in {{Catalog A}} and certain models remained available through {{Catalog T}}.  


The Type 107 series was introduced 1916 as "Variometers" or variable inductors of the Ayrton–Perry winding design. The basic design changed little, two circular coils arranged one inside the other. The inner coil is rotated by a calibrated inductance dial. By changing the orientation of the rotor coil inductance varied. The leads of the two coils are brought out to four binding posts where connections determine series, parallel or mutual inductance settings. In 1932 five new types were announced, types [[107-J]], [[107-K]], [[107-L]], [[107-M]], and [[107-N]]. These five were the only types available until production stopped after {{Catalog T}} in 1968.  These types produced from 1932 to 1968 featured a Bakelite panel and walnut case.  The chart below contains published specifications, tags attached to the panel displayed the actual values.
The Type 107 series was introduced 1916 as "Variometers" or variable inductors of the [[wikipedia:Ayrton-Perry winding|Ayrton–Perry winding]] design. The basic design changed little, two circular coils arranged one inside the other. The inner coil is rotated by a calibrated inductance dial. By changing the orientation of the rotor coil, inductance can be varied.  
 
The leads of the two coils are brought out to four binding posts where connections determine series, parallel or mutual inductance settings.  
 
In 1932, five new types − [[107-J]], [[107-K]], [[107-L]], [[107-M]], and [[107-N]] − were announced. These five types featured a Bakelite panel and walnut case, and were the only types available until production stopped after {{Catalog T}}.   
 
The chart below contains published specifications, tags attached to the panel displayed the actual values.
   
   
==Specifications==
==Specifications==


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|[[107-A]] ||  15 to 250 μH ||  ||  ||    || 4 A
|[[107-A]] ||  15 to 250 μH ||  ||  ||    || 4 A
|-
|-
|[[107-B]] || .25 to 4 mH   ||  ||  ||    || 1 A  
|[[107-B]] || 0.25 to 4 mH ||  ||  ||    || 1 A  
|-
|-
|[[107-C]] || 8 to 400 μH  ||  ||  ||    || 3 A
|[[107-C]] || 8 to 400 μH  ||  ||  ||    || 3 A
|-
|-
|[[107-D]] || .12 to 6 mH   ||  ||  ||    || 1 A
|[[107-D]] || 0.12 to 6 mH ||  ||  ||    || 1 A
|-
|-
|[[107-E]] || .4 to 20 mH   ||  ||  ||    || .5 A
|[[107-E]] || 0.4 to 20 mH ||  ||  ||    || .5 A
|-
|-
|[[107-F]] || 40 to 400 μH  ||  ||  || .55 Ω  ||
|[[107-F]] || 40 to 400 μH  ||  ||  || 0.55 Ω  ||
|-
|-
|[[107-G]] || .4 to 4 mH   ||  ||  || 6.11 Ω  ||
|[[107-G]] || 0.4 to 4 mH   ||  ||  || 6.11 Ω  ||
|-
|-
|[[107-H]] || 1.8 to 18 mH  ||  ||  || 14.18 Ω ||
|[[107-H]] || 1.8 to 18 mH  ||  ||  || 14.18 Ω ||
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|[[107-J]] ||  9 to 50  μH  || 2.25 to 12.5 μH  || 0 to 10.8 μH || 0.053 Ω || 16 A
|[[107-J]] ||  9 to 50  μH  || 2.25 to 12.5 μH  || 0 to 10.8 μH || 0.053 Ω || 16 A
|-
|-
|[[107-K]] || 90 to 500  μH || 22.5 to 125 μH  || 0 to 110 μH  || 0.38 Ω  || 6 A
|[[107-K]] || 90 to 500 μH  || 22.5 to 125 μH  || 0 to 110 μH  || 0.38 Ω  || 6 A
|-
|-
|[[107-L]] || .9 to 5  mH   || .225 to 1.25 mH  || 0 to 1.1 mH  || 5 Ω    || 1.7 A
|[[107-L]] || 0.9 to 5 mH   || 0.225 to 1.25 mH  || 0 to 1.1 mH  || 5 Ω    || 1.7 A
|-
|-
|[[107-M]] || 9 to 50  mH  || 2.25 to 12.5 mH  || 0 to 11 mH  || 36 Ω    || .65 A
|[[107-M]] || 9 to 50  mH  || 2.25 to 12.5 mH  || 0 to 11 mH  || 36 Ω    || .65 A
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