Valve Cross Reference

Apart from an open filament, valves are seldom defective even after 70 years; more often the valve is missing or broken. On sets from before 1930 the exact original is not always possible to find. Each maker used its own markings, but most valves were virtually equivalent to their competitors’.

Find a valve

British valves

Marconi, Mullard, Mazda, Cossor, Osram and Six-Sixty.

Mullard	Cossor	Marconi, Osram	Mazda	Six Sixty	Type	Fil
PM12M	220VS	VS2	S215VM	218VSG	Screened grid multi-mu, tetrode	B2
PM12V	220VSG	–	–	215VSG	Screened grid HF amp, tetrode	B2
PM12A	220SG	S22	S215B	218SG	Screened grid HF amp, tetrode	B2
PM12	215SG	S215, S21	S215A, SG215	215SG	Screened grid, tetrode	B2
PM1A	210RC	H2	H210	210RC	Resistance/capacity coupled triode	B2
PM1HF	210HF	HL210	–	210HF	Med. imp. HF or detector, triode	B2
PM1HL	210HL	HL210	HL210, HL2	210HL	Non-microphonic detector, triode	B2
PM1LF	210LF	L210	–	210LF	Med. imp. LF or detector, triode	B2
PM2DX	210Det	L2/B	L210, L2	210D	Detector & LF amplifier, triode	B2
PM2A	220PA	LP2	P220	220PA	Power output, triode	B2
PM2	220P	P215	–	220P	Power output, triode	B2
PM202	–	P2	P220A	220SP	Super power output, triode	B2
PM252	230XP	P240	P240	240SP	Super power output, triode	B2
PM22A	220HPT	PT2	Pen220	220Pen	Low consumption output, pentode	B2
PM22	230HPT, 220PT	PT240	Pen230, Pen220A	230PP	Super power output, pentode	B2
PM2B	220B	–	PD220	–	Class B output, triode	B2
PM14	410SG	S410	–	4075SG	Screened grid, tetrode	B4
PM3A	410RC	H410	–	4075RC	Resistance/capacity coupled triode	B4
PM3	410HF	HL410	–	4075HF	Med. imp. LF or detector, triode	B4
PM4DX	410LF	L410	–	410D	Med. imp. LF or detector, triode	B4
PM4	410P	P410	–	410P	Power output, triode	B4
PM254	425XP, 415XP	P415, P425	P425	420SP	Super power output, triode	B4
PM16	610SG	S610	–	6075SG	Screened grid, tetrode	B6
PM5X	610HF	HL610	HL610	6075HF	Med. imp. LF or detector, triode	B6
PM6D	610LF	L610	–	610D	Med. imp. LF or detector, triode	B6
PM256	625P	P625	P625B	625SP	Super power output, triode	B6
PM256A	610XP	P625A	P625A	625SPA	Super power output, triode	B6
PM26	615PT	PT625	–	617PP	Super power output, pentode	B6
VP4	–	–	–	HP2AC	Screened grid multi-mu HF, tetrode	IA4
SP4	MSPen	–	–	HP1AC	Screened grid HF amp, tetrode	IA4
MM4V	MVSG	VMS4	AC/SGVM	4MMAC	Screened grid amp multi-mu, tetrode	IA4
S4VA	–	–	AC/S2	4XSGAC	Screened grid amp, tetrode	IA4
S4VB	MSG/LA	MS4, MS/4/B	AC/SG	4YSGAC	Screened grid amp, tetrode	IA4
TDD4	–	MHD4	–	–	LF amp & detector, double diode triode	IA4
SD4	–	–	–	–	SG LF amp & detector, diode tetrode	IA4
904V	41MH	–	AC2/HL	4DXAC	High magnification detector, triode	IA4
354V	41MHF	MH4	ACHL	4GPAC	Detector & general purpose, triode	IA4
244V	41MHL	MHL4	–	4HLAC	General purpose, triode	IA4
164V	41MLF	–	–	4LAC	General purpose, triode	IA4
Pen4V	MPPen	–	–	4PenAC	Power output, tetrode	IA4
Pen4VA	MPPenA	MPT4	ACPen	–	Power output, tetrode	IA4
ACO64	–	–	–	HV 4/1	Output amp, triode	DA4
ACO44	4XP	PX4	PP3/250	HV4/2	Output amp, pentode	DA4
DO24	–	PX25	PP5/400	–	Output amp, triode	DA4
DO25	620T	LS6A	–	HV 6/5	Output amp, triode	DA6
DO26	–	–	–	–	Output amp, triode	DA4
PM24A	–	–	–	4PenSP	Output amp, pentode	DA4
PM24M	PT41	PT4	–	4PenM	Output amp, pentode	DA4
PM24D	–	PT25	–	–	Output amp, pentode	DA4
DO60	660T	DA60	–	–	Output amp, triode	DA6
DO75	–	–	ES75	–	Output amp, triode	DA10
DW2	506BU	U10	UU4	W462	60mA @ 250v, double diode rectifier	DA4
DW3	442BU	U12	UU120/350	W120/350	120mA @ 350v, double diode rectifier	DA4
DW4	460BU	U14	UU120/500	W120/500	120mA @ 500v, double diode rectifier	DA4
IW2	–	–	UU2	W60/250	60mA @ 250v, double diode rectifier	IA4
IW2A	–	–	UU60/250	IH60/250	75mA @300v, double diode rectifier	IA4
IW3	–	–	–	–	120mA @ 350v, double diode rectifier	IA4

– no equivalent listed. Fil codes: B = battery, DA = directly heated AC, IA = indirectly heated AC; the number is the filament voltage.

European valves

Cossor, Dario, Fotos Grammont, Gecovalve, Mazda, Mullard, Osram, Philips, Record, Telefunken, Tungsram, Valvo, Vatea and Visseaux, grouped by filament voltage.

Valves with 2 Volt Filaments (Battery)

Philips	Gecovalve	Cossor	Mullard	Tungsram
B217	L21	215P	PM2DX	LP220
B228	HL2K	210HF	PMIHL	LD210
B240	B21	–	PM2BA	CB220

Valves with 4 Volt Filaments (Battery)

Philips	Visseaux	Mazda	Fotos, Grammont	Dario	Valvo	Gecovalve	Cossor	Mullard	Vatea	Telefunken	Tungsram
A409	RO4109	DZ908, TM2	C9	R75	H406	–	–	–	UX406	RE074	L414, G407
A410	RO4010	DZ2222	B35	R36	–	HL410	–	–	H406	RE064	G405
A414	–	–	–	–	–	–	–	PM4DS	–	–	G410
A415	RO4324	DZ1508	D15	R76	–	L410	–	–	HX406	–	LD410
A425	RO4125	DZ2222	C25	RT63	W406	HL410	410HF	–	RX406	RE034	HR406
A435	RO4135	DZ3529	B25	–	–	–	410RC	PMÃ	–	–	HR406
A441	RO4141	DZ1, TMBG	MX40	R43, TA41	U409D	BG4	410DG	PM4DG	DX406	RE074D	DG407
A442	RO4142	DZ2	C150	TA42	H406D	S410	410SG	–	SX406	RES094	S4066
B403	–	–	D5	–	–	–	425XP	–	–	–	P415, P430
B405	RO4305	DX502	D5	R77, TB05	L414	P415	415XP	PM254X	LX414	RE124	P414
B406	RO4206	DY604	–	TB06	L410	P410	–	PM4X	LX410	RE114	P410
B409	RO4309	DX804	D9	RT77, TB09	L413	–	410LF	PM4	UX406	RE124	L414
B415	–	–	–	–	–	–	410PT	–	–	–	L414
B424	RO4324	DZ908	C9	TB24	A411	L410	–	PM3DX	–	–	HR406
B425	–	DW302	–	–	–	–	–	–	–	REN604	–
B438	RO4324	–	D40	–	W411	–	–	–	–	–	HR410
B442	RO4142	–	–	TB42	–	–	–	–	–	RES024	S410
B443	RO4243	DX3	D100N	TB43	L415D	PT425	410PT	PM24	TL414	RES174D	PP415
B443S	–	–	D60	TB438	L416D	PT425	–	–	–	RES164	PP416
B543	–	–	–	–	L510D	–	–	–	TL510S	RES105	PP610

Valves with 4 Volt Filaments

Philips	Visseaux	Mazda	Fotos, Grammont	Dario	Osram	Record	Valvo	GecoValve	Cossor	Mullard	Vatea	Telefunken	Tungsram
C405	–	DW302	–	–	–	–	LK430	–	–	PM254	PX430	RE304	P430
C443	RS4343	DW3	F100	TC43	–	–	L425D	PT4	–	PM2Ã	TW425	RES364	PP430
C443N	–	–	–	TC43N	–	–	L427D	–	–	PM24DC	–	RES374	PP431
D404	RO4404	DW802	P10	–	–	–	LK600	–	–	AC044X	PX460	RE604	P460
D410	RO4610	–	F10	–	–	–	–	–	–	AC064X	–	–	P455
E406	601	DW601	P10/F5	TE06	PX4	–	–	PX4	4XP	AC064	PX4110	RE604	P4100
E408,B425	–	DW302	–	TE08	–	–	LK4110	–	–	AC084	–	RS241	–
E409	RS4309	DW1003	–	–	–	–	–	–	–	–	–	RENS1104	AL495
E415/E424	RS4215	–	S415N	TE15	–	–	A4100	MHL4	41MLF	224V	HV4100	REN804	AG4100
E424	RS4324	DW4011	TL415	TE24	–	–	A4110	MH4	41MHF	354V	RV4100	REN904	AG495
E435	RS4230	–	S440N	TE38	–	–	–	MH4	–	–	–	–	–
E438	RS4238	DW4023	S440N	TE38	–	–	W4080	–	41MH	354VX	RV4110	REN1004	AR4100, AR4701
E441	RS4341	DW1B	TM4	TE41	–	DN44	A4100D	MBG4	41MDG	AC/DG	DV4100	REN704D	GD4101
E442	RS4142, RS4342	DW6	S4150	TE42	–	–	H4100D	MS4	MSG/HA	S4V	SV4100	–	AS494
E442S	RS4142N	DW2	S4150E	TE42S	–	–	H4080D	–	41MSG	S4VX	SV490	RENS1204	AS4100
E443H	RS4543	DW11	–	TE43H	–	–	L496D	–	–	PM24M	TV4110	RES964	PP4101
E444	RS4144	–	T4400	TE44	–	–	AN4126	–	–	SD4	SB4110	RENS1254	DS4100
E444S	–	–	–	TE44S	–	–	AN4092	–	–	TD4	RB4110	REN924	DS4101
E445	RS4142	DW8	S4150C	TE45	–	–	H4125D	–	–	YM4V	MV4100	RS1214	–
E446	RS4346	–	T4600	TE46	–	–	H4128D	MSP4	–	SP4	ST4110	RENS1284	HP4100
E447/AF2	RS4347	–	T4700	TE47	–	–	H4129D	VMP4	–	VP4	MT4110	RENS1294	HP4106, AS4100
E448	–	–	T4000	TE48	–	–	X4122	–	–	DH4	QU4100	RS1224	MH4100, FH4105
E449	–	–	–	TE49	–	–	X4123	–	–	VH4	QT4100	RENS1234	FH4105
E452T/AF2	RS4342	DW7	T4500	TE52	–	–	X4111D	MS4B	MSGLA	S4VB	SV4110	RENS1264	AS4120
E453	RS4353	DW9	S100	TE53	–	–	L4150D	MPT4	Mp PEN	PEN 4vx	–	RENS1374	APP4120
E455	RS4345	DW8	T4500C	TE55	–	–	H4115D	VMS4B	MVSG	MM4V	MV4110	RENS1274	AS4125
E462, E446	–	–	–	–	–	–	–	–	–	–	–	–	AS4120
E463	–	–	–	TE63	–	–	L4138D	–	42mp,PEN	PEN 4va	TK4110	RES1384	APP4130, APP4120
E499	–	–	–	TE99	–	–	W4110	–	–	994V	RV4110	REN914	AR495
F443	–	–	–	TE43	–	–	L495D	PT25	–	PM24D	TV4200	–	PP4101
AB1	–	–	NDD40	TB1	–	–	AB1	–	DD4	2D4	BB4110	AB1	DD465
AF2	–	DW2	–	TF2	–	–	AF2	–	–	VPÃ	NT4110	AF2	HP4115, HP4106
AK1	–	–	–	TK1	–	–	–	–	–	FC4	SO4110	AK1	MO465

Valves with 20 Volt Filaments (approximate equivalent)

Philips	Telefunken	Dario	Mullard	Tungsram	Valvo	Vatea
B2006	REN1822	CT06	HL20	P2018	L2213	LG2018
B2038	REN1821	CT38	HL20	R2018/G2018	A2118	AG2018
B2041	RENS1817D	CT41	–	DG2018	U1718D	DG2018
B2042	RENS1820	CT42	SG20A	S2018	H2018D	SG2018
B2043	RENS1823	CT43	Pen20	DG2018/PP2018	L2318D	TL2018
B2044	–	–	–	–	–	–
B2045	RENS1819	CT45	VM20	S2018, SE2018	H1918D	MG2018
B2046	RENS1884	CT46	SP20	HP2018	H2518D	ST2118
B2047	RENS1894	CT47	VP20	HP2118	H2618D	MF2118
B2052T	RENS1818	CT52	SG20	SS2018	H1818D	SG2118
B2055	–	CT55	MM20	SE2118	–	–
B2099	–	–	–	R2018	–	–
BL2 (30Volts)	BL2	TE40	–	PP4018	BL2	–

Valves with 4 Volt Filaments (approximate equivalent)

Philips	Fotos, Grammont	Dario	Valvo	Mazda	Cossor	Mullard	Telefunken	Tungsram	Vatea	Visseaux	Gecovalve
505	–	TV105	G495	–	412SU	DU4	RGN1304	V495	–	V1	–
506	W6	TV80	G490	D380B	442BU	DW2X	RGN1054	PV495	RE4100	V2	U10
1561	V22/W10	TV90	–	–	460BU	–	RGN2004	PV4002 /PV4201	–	–	–
1562	W20	–	–	–	–	DU15	–	–	–	–	–
1801	V21B	TV60	G430	D350B	506BU	DW1	RGN504	PV430	RE450	V250	–
1802	V21M	TV61	–	–	–	–	RGN354	V430	RE425	V150	–
1805/506	–	TV81	G4100	–	–	DW7X	RGN1064	PV4100	RE4110	–	–
1815/1817	W10	TV100	G4250	–	4ÃU	DW4	RGN2504	PV4201	–	–	U14
1832	V22-23	TV90	G4200	D5125B	460BU	DW3	RGN2004	PV4200	RE4200	V480	U12