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|class=inductance standards
|class=inductance standards
|summary=Variable Inductor
|summary=Variable Inductor
|image=GR 107-J Close-Up
|image=GR 107-J Front.jpg
|caption=General Radio 107 Series Variable Inductors
|caption=General Radio 107 Series Variable Inductors
|series=107
|series=107
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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 method. 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

Latest revision as of 19:52, 3 August 2024

General Radio 107
Variable Inductor
General Radio 107 Series Variable Inductors

Available from 1916 to 1968

Manuals
  • Manual Needed.
Catalog History
 Document Year Page
Catalog A 1916 9
Catalog B 1918 26
Catalog C 1919 47
Bulletins 1920 1920 B301
Bulletins 1921 1921 B303
Bulletins 1923 1923 B305
Bulletins 1926 1926 B307
Catalog E1 1928 37
Catalog E2 1928 37
Catalog F1 1930 32
Catalog G1 1932 43
Catalog H 1935 32
Catalog J 1936 42
Catalog K1 1939 62
Catalog K2 1942 57
Catalog K3 1944 54
Catalog K4 1945 54
Catalog L 1948 58
Catalog M 1951 56
Catalog N 1954 62
Catalog P 1959 178
Catalog Q 1961 175
Catalog R 1963 164
Catalog S 1965 207
Catalog T 1968 103
(All manuals in PDF format unless noted otherwise)

The General Radio 107 Series of Variable Inductors were introduced in Catalog A (1916) and certain models remained available through Catalog T (1968).

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 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 (1968).

The chart below contains published specifications, tags attached to the panel displayed the actual values.

Specifications

Type 107 Series Variable Inductors
Inductor Type Serial Self-Inductance Parallel Self-Inductance Mutual Inductance Resistance Max. Current
107-A 15 to 250 μH 4 A
107-B 0.25 to 4 mH 1 A
107-C 8 to 400 μH 3 A
107-D 0.12 to 6 mH 1 A
107-E 0.4 to 20 mH .5 A
107-F 40 to 400 μH 0.55 Ω
107-G 0.4 to 4 mH 6.11 Ω
107-H 1.8 to 18 mH 14.18 Ω
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-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-N 90 to 500 mH 22.5 to 125 mH 0 to 110 mH 450 Ω .17 A

Links

Photos

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