Type	RCA Name	Cunningham	Arcturus	DeForest	CeCo	WLS	Description
00 Types	UV200						tipped globe, brass base
	UV200						nontipped globe, brass base
	UV200				H		nontipped globe, bakelite base
	UX200					2950	nontipped globe, bakelite base
	UX200A					4602	nontipped globe, bakelite base
01 Types	UV201						tipped globe, brass base
	UV201A						tipped globe, brass base
	UV201A						nontipped globe, brass base
	UV201A			DV-2	A	2964	nontipped globe, bakelite base
	UX201A			DL-2	A, AX	2976,4600	nontipped globe, bakelite base
	01A						ST, bakelite UX base
10	UX210	CX310		410	L-10	4618	globe, bakelite base
11	WD-11	C-11					tubular, brass base, odd pinout
12	WD-12	C-12					tubular, brass base, odd pinout
	WX-12					4615	tubular, UX bakelite 4-pin base
12A Types	UV-112					2953
	UX-112	CX-112			F	2977,4612	globe, bakelite base
	UX-112A	CX-112A		412A			globe, bakelite base
	12A						ST, bakelite base
13	UX-213						globe, bakelite base
16	UX-216						globe, bakelite base
20	UX-120	CX-220		420	E		globe, bakelite base
22	UX-222	CX-322		422	RF-22		globe, bakelite base
24	UY-224	C-324	124	424		4603	globe, bakelite base
26	UX-226	CX-326	126	426	M	4630	globe, bakelite base
27	UY-227	C-327	127	427	N	4631	globe, bakelite base
30	230	330		430			tubular or globe, bakelite base
31	231	331		431			tubular or globe, bakelite base
32	232	332		432			globe, bakelite base
33	233						globe, bakelite base
34	234						globe, bakelite base
35	235						globe, bakelite base
36	236		136				globe, bakelite base
37	237		137				globe, bakelite base
38	238		138				globe, bakelite base
39	239						globe, bakelite base
40	UX-240	CX-340	140	DL-5	G	2969	globe, bakelite base
45	UX-245	CX-345	145	445			globe, bakelite base
47	247		PZ				globe, bakelite base
50	UX-250	CX-350		450	L-50	4617	globe, bakelite base
51			551				globe, bakelite base
71/71A Types	UX-171	CX-371		DL-14	J	2968	globe, bakelite base
	UX-171A	CX-371A		471A	J	4616	globe, bakelite base
	71A						ST, bakelite base
80	UX-280	CX-380	180	480		4620	globe, bakelite base
81	UX-281	CX-381		481	R	4619	globe, bakelite base
99 Types	UV-199	C-299		DV-3	B, C	2951,4610	tubular, UV bakelite 4-pin base
	UX-199	CX-299		DL-3	BX	2952,4611	tubular, UX bakelite 4-pin base
	V-99						tubular, UV bakelite 4-pin base
	X-99						tubular, UX bakelite 4-pin base
Note: 12 and 12A types are NOT INTERCHANGEABLE
Note: The RCA type name may change its first letter for tubes from a different manufacturer.
For example, RCA UX-245 = Sylvania SX-245 = National Union NX-245.
Sparton Types. Do NOT substitute for 2-digit types.
182B							Power triode
183							Power triode
482B							Power triode
483							Power triode
484							RF triode
485							RF triode
585/586							Power triode, substitute for type 50
Other commonly found 3-digit types. Do NOT substitute for 2-digit types
401 (Kellogg, Cardon/Sparton)
800 series
Western Electric (WE- ) series
950 = 1F4
951 = 1B4P
Newer letter types
PZH = 2A5
LA = 6A4
XXB = 3C6
XXD = 14AF7
XXFM = 7X7
XXL = 7A4
BH. No equivalent, this is a cold-cathode rectifier. WLS equiv 4621.