Ballasts in radios

It is a great and useful list though.
 Somewhere here I have the Ballast Tube Handbook.
Lots of valuable info.
 JFD also made ballasts as well as 1-2 other companies.
 Then you get into the "fun" of the  "Universal" ballasts too.
They were quite handy to stock though. If I could remember the numbers, I'd add the ballasts from the early TV sets too.
If I can find my Ballast Tube Handbook, I'll see if I can add some more numbers to the list.

(I have also compiled what,  I hope, is a fairly complete list of Eye Tubes. I'll send that for posting as soon as I can find it on the confuser again. Its in ODF format. I know there are probably lots of Russian and other tubes not on it though.)

Looks like you're spot on, I didn't research far Enough. I compiled this from Amperite lists, assuming they just manufactured ballasts.

I will remove the 115 series.

Cliff,
IIRC most of the 115N0 xxx numbers are time delays rather than ballasts.
Or am I wrong? (again)

Heres some ballast numbers I have found on the WEB. I am sure this isn't a completed list.
I have eliminated TV types.
Some numbers may have (-) dashes and may be duplicates of ones that don't and VS/VS.
Ballast Numbers
 -------------
10.61 
100-38 
100-7 
100-70    
100-76    
100-77  
100-77 
100-79   
100-79   
100R8   
101T    
10-23-2    
10-23-A    
10-23-E    
10-23-F    
10-23-F 
10-25    
10-4   
10-40  ,    
10-4A    
10-4A  
10-4A   
10-4B    
10-4B     
10-4C    
10-4C SEE KY42D
10-4E    
10-610    
10-7  
10-AB    
10T1    
1-1       
11-3 
114A  
1-15 
11-5    
117A GE - universal replacement for K, L, M, BK, BL, BM 10 to 23 E types  
120A GE - universal replacement for K, L, M, BK, BL, BM 10 to 23 F, G, H types  
120A 
121B Airline-
12-1H    
12-20 
122A   
12-3H    
12-4  
12C10 
12C120    
12C180 
12C2   
12C3    
12C30    
12C30T    
12C5 Universal replacement - replaces all BK, BL, K, L, M 23 through 55 E types  
12C5T 
12C60    
12C60T 
12NO12    
12NO120    
12NO120T  , rare early globe type,
12NO15    
12NO15T     
12NO2 
12NO3 
12NO30 = KY42A  
12NO30T    
12NO5 See 10-23A
12NO60 See 10-23F
12NO60T See 23-55A
12NO90T See 23-55E
13-4 See 23-55F See 60-92A  See 60-92E
13-6 See 60-92F
13A See 92-105A
13B   
13C  
13J  
13L   
13T4 Universal replacement - replaces all BK, BL, K, L, M 60 through 92 A, B, C, D types  
140R4 Universal replacement - replaces all BK, BL, K, L, M 60 through 92 E types  
14292 Universal replacement - replaces all BK, BL, K, L, M 92 through 105 A, B, C, D types  5, bn
14-3 Universal replacement - replaces all BK, BL, K, L, M 92 through 105 A, B, C, D types
14B     
15-2   
15-4 
15A10      
1-6   
160A    
16-3 
16-4  -See LX55B
165L4 See LX55C
165R See KX55D
165R4    
165R8 
17A    
17A470303    
17A485459    
18-10    
182-482    
18-3    
185L4 - Cambridge Instrument part 13131
185L8   
185R4 
185R44    
1A1    
1A10      
1B1    
1-B-1    
1D1   
1D2      
1F1    
1G1  
1H20  
1H22     
1H3    
1H4B   
1HM4  
1HT4     
1HTF10    
1HTF11    
1HTF4    
1K1 
1P40    
1U1    
2/20/1930   - universal replacement for K, L, M, 40 to 100 ending in S2  
200R   - universal replacement for K, L, M, BK, BL, BM 67 to 105 A, B, C and D    
200R   - universal replacement for K, L, M, BK, BL, BM 67 to 105 A, B, C and D
201C   KS-14501, D5-10  
20-3    
20-4   = 185R44  
21A157    
22-4 Clarostat-see-42A1  
2-3 Champion = type 2LR21 , 
23-55-3    
23-55A  
23-55-E    
23D4 
24-3    
250B 
250B4    
250R 
250R4   
250R8  
25-4    
26-4A See L49E1
26C10T  
26C120 
26C15  
26C180    
26C2 See 7H-4B
26C20 See 23-55E
26C2T See 23-55A
26C3    
26C30 
26C30T 
26C3T 
26C45 
26C45T 
26C5 
26C5T 
26C6 
26C60 
26C60T 
26C8 
26F45 
26F60T 
26F75T 
26F90 
26F90T 
26NO10 
26NO10T 
26NO120 
26NO120T 
26NO15 
26NO15T 
26NO180 
26NO2 
26NO20 
26NO20T 
26NO2T 
26NO3 
26NO30 
26NO30T 
26NO3T 
26NO45 
26NO45T 
26NO4T 
26NO5 
26NO5T 
26NO60 
26NO60T 
26NO90 
2A10 
2A12 
2A20 
2AS15A 
2B14 
2C30 
2C5 
2C60 
2H-10 
2H10R 
2H-20 
2H-8 
2HT2 
2HT4 
2HT7 
2HTF4 
2LR212 
2NO120 
2NO2 
2NO3 
2NO30 
2NO30T 
2NO45 
2NO50 
2NO90 
2TK7 
2V10T1 
300R 
3-1 
3-11 
3-14 
3-14B 
3-16 
320R4 
320R8 
3-38A 
3-4 
3-40 
34-2 
350R 
350R8 
35-4 
3-6 
36-11 
3-7 
3-9 
3A10 
3A10B 
3A20 
3A8 
3ER-284 
3H-11 
3H-12 
3H-17 
3H-1-7 
3H-20B 
3H-25 
3H4 
3H7 
3HTF4 
3HTF7 
3R16 
3R-16 
3T4 
3T4A 
3TF12 
3TF4 
3TF4A 
3TF7 
3TFV4 
3TK2 
3TV4 
3V4 
40-3 
40-6E 
40A1 
40B2 
4-10 
4-10 
4-11 
4-12 
41-7E 
42-2H 
4-25 
42A1 
4-3 
43-3 
4-5 
45-4001 
45-4001-2 
45-4001-3 
45-4001-4 
45-4001-5 
45-4001-6 
45-4001-7 
45-4001-8 
45-4001-9 
4-6 
464-5 
465C-5 
46A1 
46B1 
4-7 
4-8 
4-9 
4A1 
4A10 
4B 
4H10 
4H-10 
4H-12 
4H3 
4H-3 
4H-4 
4HTF4 
4HTF4 
4HTF7 
4P-45 
501 
50A2 
50B2 
50C10 
50C15 
50C21 
50C5 
50C90 
50NO120 
50NO2 
50NO20T 
50NO45T 
50NO5 
50NO6 
5-4 
5-4B 
55-4 
55A 
55A2 
5624/B46 
5678 
5944545 
5A10 
5A10 
5-E1 
5HA20 
5N05 
5NO15 
5NO20T 
5NO34 
5T1A 
5TF2 
5TF4 
6 
600-15 
601B 
60-92-2 
60-92A 
60-92E 
60-92F 
6-1 
6-11 
6-12 
6-13 
6-15 
6-1H 
6-3 
6-36 
6-4 
655S2 
6-7 
6-88 
6-8B 
69-1 
6C10 
6C10T 
6C120 
6C15 
6C180 
6C2 
6C20 
6C2T 
6C3 
6C30 
6C30 
6C30T 
6C45T 
6C5 
6C5T 
6C60 
6C60T 
6C75T 
6C90 
6F15 
6F30 
6F60 
6F60T 
6H-11 
6H4 
6H4 
6H-4 
6H6 
6H6 
6H-6 
6NO10 
6NO10 
6NO10T 
6NO120 
6NO15 
6NO15 
6NO150 
6NO15T 
6NO180 
6NO180T 
6NO2 
6NO20 
6NO20T 
6NO25 
6NO2T 
6NO3 
6NO30 
6NO30G 
6NO30T 
6NO40 
6NO45 
6NO45T 
6NO5 
6NO5T 
6NO60 
6NO60T 
6NO75 
6NO75T 
6NO90 
6NO90T 
6P90 
6T4 
6T4F 
6TF4 
6TF7 
7-10 
710Z 
7-3 
7-4 
7-6 
7-7 
79 
7-9 
7A 
7A10 
7A20 
7H-1 
7H-10 
7H-11 
7H4 
7H4 
7H4B 
7H-4B 
7H7B 
7HTF4 
7TF4 
8-11 
8233 
8-3B 
8-3B 
8-4 
8600 
8-9 
8A 
8A10 
8A104 
8A10B 
92*105A 
92*105A 
92-105 
9-30 
93-2 
9-4 
9-4A 
9-4D 
9-7 
9-8 
9A10 
9A22 
9TF4 
B2104 
BK29B 
BK29D 
BK36B 
BK42B 
BK49B 
BK55D 
BKV51DJ 
BM36C 
BM42C 
BM49C 
CAA 
CR1250 
CR1250-1.5 
CR200 
CR900-4 
D-35 
D5TF30 
D6-10 
D6TF10 
D6TF30 
D6TF9 
D70V 
D-740 
D7H-20 
D7HT11 
DC80V 
EDIS501 
G127A 
G9-B 
GH-2392-12E 
HY114B 
J-438 
K105A 
K17E 
K18B 
K23AJ 
K23B 
K24C 
K25J218 
K36B 
K42A 
K42B 
K42C 
K42D 
K42E 
K42G 
K43B 
K49B 
K49C 
K49D 
K49D 
K55A 
K55B 
K55C 
K55CP 
K55E 
K67B 
K67BJ 
K688J 
K70B 
K74C 
K80A 
K80B 
K87B 
K90B 
K92A 
K92B 
KL25 
KL45 
KL45J 
KL5083 
KL50H 
KL50S1 
KL-50S2 
KL50S3 
KL75 
KL-75 
KL75H 
KS13977 
KS13991 
KS14404 
KS14454 
KS-14501 
KS16479 
KX24B 
KX42B 
KX55D 
KX74B 
KX74C 
KX80A 
KY42A 
KY42D 
KY49C 
KZ49B 
KZ49C 
L155B 
L36D 
L36DJG 
L40S2 
L42B 
L42C 
L42DG 
L42E 
L49B 
L49C 
L49D 
L49DJ 
L49J 
L49S 
L55 
L55B 
L55C 
L55C 
L55D 
L55E 
L55S1 
L67D 
L70B 
LX55B 
LX55C 
LX55D 
M15S 
M42B 
M42B 
M49B 
MX408U 
P27287 
PB-57 
R2D4 
R530 
RGA120 
RR782 
SC3765A 
SC8903A 
TJ102L01 
TJ102L021 
TJ311M01 
TJ601K01 
TJ791K01 
TJ801K 
TJ801K-1 
TJ880 
TYPE 6 
TYPE A 
TYPE B 
TYPE C 
URB-002 
URB-004 
URB008 
UV199 
W45788 
WL-788 
X35 
X44 
XB1

Ballasts were designed to limit current in radios because of line voltage fluxuations in in power. They were also designed to provide voltage taps.
There were many Part numbers used by manufacturers with no standards for numbering. That is why some numbers make no sense to the layman.

At first Ballasts were also called barreters. They can be made of Nichrome wire or other suitable metal to have a  Positive temperature coefficient of resistance, so as current increases, resistance rises to limit current. ( the word ballast is used aboard Ships to stabilize (or Balance) the hull and keep the ship upright) The same principle here is to balance the voltage vs current. 

Here is a good article on Ballasts: Click Here

A close relationship exists between resistance cords and dropper resistors and ballasts. Here is a good article on that subject. click here for calculations