Oftentimes I see postings in the radio newsgroups from people that are not sure if, for example, the globe type CX301A is equivalent to the generic type '01A. The short answer is "Yes". Before about 1932, three digit numbers were assigned to receiving types, and in some cases, the first digit signified the company. RCA's numbers were "200" numbers, and most small companies defaulted to these. As far as the other major players, Cunningham used "300" numbers, DeForest and Sparton used "400" numbers, and Arcturus used "100" numbers. Below is a table summarizing the equivalents, along with giving equivalents for some peculiar lettered types. Note that none of the Western Electric types with similar numbers are equivalent to these standard types below.

Standard # RCA et al Cunningham Arcturus DeForest Sparton CeCo Van Horne WD-11 WD-11 C-11           WD-12 WD-12 C-12           WX-12 WX-12 CX-12           00A 200A 300A         5VD 01A 201A 301A 101A 401A   A 5VA 10 210 310 110 410   L-10 6P 12A 112A 112A 012A 412A   F-12A 5VC 20 120 220   420   E   22 222 322 122 422   RF-22   24A 224/224A 324/324A 122/124 424   AC-22   26 226 326 126 426   M-26   27 227 327 127/127A 427 427 N-27   30 230 330 130 430       31 231 331 131 431       32 232 332 132 432       33 233 333 133 433       34 234 334 134 434       35/51 235/251 335 551 435/451 435     36 236 336 136/136A 436       37 237 337 137/137A 437       38 238 338 138/138A 438       39/44 239/244 339 139A 439       40 240 340   440   G   45 245 345 145 445 445 L-45   47 247 347 PZ 447       50 250 350 150 450 585/586 L-50   71A 171A 371A 071A 471B   J-71A   80 280 380 180 480 480 R-80 5R 81 281 381 181 481 481 R-81 7.5R 99 199 299 99 499   B 3VB 874 874 374