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List of Valves by Designation with Equivalent Types

4

B4	1	2	3	4
	a	g1	f	f

 
Triode

Triode	Vh	Ah
	4.0V	0.7

 
 

40

Triode

CV2501

4011A

Triode

CV1415

4017B

Rectifier HW

CV1446

4019B

Double Triode

AR11 CV1309

401A

Cathode-Ray Tube

401D

Triode

402PenA

1938

Pentode

4020

Triode

AR12 CV1310

4021B

Triode

AR20 CV1316

4022AR

Triode

AR13 CV1311

4033A

B5	1	2	3	4	5
	h	a	g1	c	h

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	6.0	1.4	600	-20	170	1,670	9.0	15

 
3B/102B CV0084 CV1220 NT37

4033L

B5	1	2	3	4	5
	h	a	g1	c	h

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	6.0	1.4	600	-20	170	1,670	9.0	15

 
CV1220 CV1688 3B/303A 3033A 4033A 3B/252B

4043C

Triode

3B/350A CV1448

4046A

Pentode

CV0244 MS/Pen

4049

Rectifier HW

CV1355 ESU300

4049A

Rectifier HW

CV1471

4049D

Rectifier (MV)

AH221

4052A

Pentode

CV1081

405BU

1937

Rectifier FW

4061A

Pentode

ATP10 CV1369 5B/100A RK25

4064B

Rectifier HW

Rectifier	Vh	Ah	mAa
	5.0	7.5	1250

 
872 872A AH217 CV0642 CV1449 ESU872

4066A

B7	1	2	3	4	5	6	7
	-	g1	g2	h	h	k,g3	a

 
Pentode

Beam Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm	Pout	D
	4.0	2.0	250	250	-4.4	40	8.5	10.5	4.2W	8%

 
7A3 ARP25 CV1181 KT41 NR59 PenA4

4067

1957

	1	2	3	4	5
	a	g2	f+,g3	g1	f-

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs
	0.5	0.08	12	21	-1.7	0.5	-

 
 

4069A

Pentode

ATP100 CV1372

4074A

UX7	1	2	3	4	5	6	7	tc	tc
	h	-	g1(1)	k	g1(2)	-	h	a(1)	a(2)

 
Double Triode

Triode	Vh	Ah	Va	Vg	mAa	Pdriv	Pdiss	Pout	freq	f.max
	6.3	0.8	300	-50	90	1W	10W	15W	100MHz	300MHz

 
2C34 CV0018 CV1061 DET19 RK34 VT61 VT-224 TV03-10 VT61

4074B

B5	1	2	3	4	5	tc	tc
	g1(1)	g1(2)	h	h	k	a(1)	a(2)

 
Double Triode

Triode	Vh	Ah	Va	Vg	mAa	Pdriv	Pout
	6.3	0.8	300	-50	90	1W	15W

 
CV1573 VT61A

408BU

1930

Rectifier FW

40CB4

Cathode-Ray Tube

40PPA

1934

Pentode

7D3

40SUA

1934

B5	1	2	3	4	5
	a	-	h	h	k

 
Rectifier HW

Rectifier	Vh	Ah	Va	mAa
	40.0	0.2	250	100

 
1D5 CV1267 U4020 V20 UR1C C108 RZ

41

1936

UX6	1	2	3	4	5	6
	h	a	g2	g1	k,g3	h

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	gm
	6.3	0.4	315	285	-18	32	2.3

 
CV0608

4101D

1925

Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	4.5	1.0	190	-20	12.0	5,600	1.07	6

 
VT-no.31 CV1638 SY4101D

4102D

1925

	1	2	3	4
	f	a	g1	f

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	2.0	0.97	190	-	1.5	60,000	0.5	30

 
VT-no.32

410LF

1927

B4	1	2	3	4
	a	g1	f	f

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	0.1	150	-4.5	3.9	8,500	1.76

 
CV1152 L410 NR15A PM4DX

410LFT

B4	1	2	3	4
	a	g1	f	f

 
Triode

410PT

1932

Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	4.0	0.1	150	150	-7.5	17	-	2.0

 
 

410RC

1927

Triode

4120

Triode

412BU

1929

Rectifier FW

412SU

1930

Rectifier HW

4152

Thermal Delay Switch

Delay	Ah	Va	mAa
	0.092	220	1,500

 
 

417A

Klystron

41FP

Triode

CV2502 CV2509

41MDG

1932

Bi-Grid

Tetrode	Vh	Ah	Va	ra	gm
	4.0	1.0	200	27,000	0.25

 
 

41ME

1938

Tuning Indicator

41MH

1931

B5	1	2	3	4	5
	a	g1	h	h	k,

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	200	-1.5	3.2	18,000	4.0

 
CV2503

41MHL

1931

B5	1	2	3	4	5
	a	g1	h	h	k

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	200	-3	4.0	11,500	4.5

 
CV2504 354V HLA2 A30D D4 MH4 AC/HL

41MLF

1929

B5	1	2	3	4	5
	a	g1	h	h	k

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	250	-8	8.0	8,000	2.5

 
CV1038 MHL4 NR26 VR38

41MLT

Triode

CV1117 VR117

41MP

1929

B5	1	2	3	4	5
	a	g1	h	h	k

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	200	-7.5	24	2500	7.5

 
CV1458

41MPG

1934

B7	1	2	3	4	5	6	7	tc
	g2	g1	g3,g5	h	h	m,k	a	g4

 
Heptode

Octode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	4.0	0.65	250	70	-1.5	1.6	3.8	0.6

 
15A2 CV2505 CV3576 FC4 MH4105 MX40 V04 VHT4 X42 A80A

41MPT

1937

Pentode

CV2506

41MTL

B5	1	2	3	4	5
	a	g1	h	h	k

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	200	-1.75	4.9	15,000	5.0

 
904V AC2/HL HLA2 MH41 V312

41MXP

1929

Pentode

41MXP ACP1 CV1122 LL4 O54V PA1

41STH

1936

B7	1	2	3	4	5	6	7	tc
	a(t)	g1(t),g3	g2,g4	h	h	m,k	a	g1

 
Triode Hexode

Hexode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	4.0	1.15	250	100	-1.5	3.0	4.0	1.6	0.6

 
CV2508 TH4 20A1 A36A X41M AC/TH1

42

1936

UX6	1	2	3	4	5	6
	h	a	g2	g1	k	h

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout
	6.3	0.7	250	250	-16.5	34	6.5	80k	2.5	3.2W

 
CV0609

420TDD

Double Diode Pentode

CV2512

4212E

	1	2	3	4
	a	g1	f	f

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	14.0	6.0	3,000	-57	350	1,900	8.4	16

 
3C/270A CV1252 CV1619

4215A

Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	μ
	1.0	0.25	60	-3	1.0	25,000	6

 
 

4242A

Triode

211 242C CV0025 ES85 UE311

426

Triode

4261

Thyratron (Mercury Vapour)

5557

4270A

CV0030

4274A

Rectifier FW

CV1451 22S/200A 274A

4279A

279A CV0669

4282

Beam Tetrode

CV1365

4282B

Beam Tetrode

ATS70

42E

UX6	1	2	3	4	5	6
	h	a	g2	g1	k	h

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout
	6.3	0.7	250	250	-16.5	34	6.5	80k	2.5	3.2W

 
CV0609

42MP/Pen

1934

B7	1	2	3	4	5	6	7
	-	g1	g2	h	h	k	a

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout	D
	4.0	1.75	250	250	-5.3	32	6.0	50,000	8.0	3.5W	10%

 
7A3 AC2/Pen CV1181 PenA4 A70C PT4 KT41 N41 TL44

42MPT

1937

Pentode

ARP7 CV1325

42OT

1937

B7	1	2	3	4	5	6	7
	1	g1	g2	h	h	k,g3	a

 
Tetrode

Beam Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	4.0	2.0	250	250	-5.5	34.0	6.0	-	7.0

 
CV2511

42PAY

Pentode

CV2513

42PTB

1937

42SPT

1937

B7	1	2	3	4	5	6	7	tc
	m	g1	g3	h	h	k	g2	a

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	4.0	2.0	250	250	-15	27	15	11

 
CV1444

43

1936

UX6	1	2	3	4	5	6
	h	a	g2	g1	k	h

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout	D
	25	0.3	160	120	-18	36	12	42,000	2.4	2.2W	10%

 
CV2514

4300A

Triode

CV1452 3B/170A 3B/400A 300B 300A 4275A

4304

Triode

CV2759

4304BB

B4	1	2	3	4	tc	tc
	-	f	f	-	g1	a

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	freq	f.max
	7.5	3.2	1000	-170	100	100 MHz	300 MHz

 
CV2761

4304CB

B4	1	2	3	4	tc	tc
	-	-	f	f	g1	a

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	Pdriv	Pdiss	Pout	freq	f.max
	7.5	3.25	1250	-225	90	4.5W	50	75	20	330

 
8019 CV1288 DET12 NT58 TSW50/A TY1-50 VT62 CV1252 CV1619 BW11 CV0315 CV1062

4307A

Pentode

CV1080

4313C

Thyratron

CV0075 3313C 313C G150/1A PTT3003

4316A

Triode

CV2762

4317

Voltage Stabiliser

CV1201

4357A

CV0027

436A

B9D	1	2	3	4	5	6	7	8	9	tc

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.45	210	175	-1	20.0	8.2		30.0

 
A2674

43E

Output Pentode

CV2514

43IU

1937

B4	1	2	3	4
	a(2)	a(1)	f	f

 
Rectifier FW

Rectifier	Vh	Ah	Va	mAa
	4.0	2.0	350	120

 
431U APV4 CV1039 CV3760 IW4-500 MU14 R3 R4A U12 U14 DW4-500 DW2 DW4-350 441U 1867 442BU R1 R2 460BU MU12 1821 506BU R42 U10 APV4 1561 IW4-350 UU120/500 1867 UU120/350 A11B UU60/250 A11C A11D

43U

B4	1	2	3	4
	a(1)	a(2)	f	f

 
Rectifier FW

Rectifier	Vh	Ah	Va	mAa
	4.0	2.3	500	120

 
CV1039 UU5

4415

Camera Tube (Image Orthicon)

P875

4416

Camera Tube (Image Orthicon)

P891

442BU

1931

B4	1	2	3	4
	a(1)	a(2)	f	f

 
Rectifier FW

Rectifier	Vh	Ah	Va	mAa
	4.0	2.5	350	120

 
CV1796 UU5

446B

Triode

2C40 CV0687

4478

Camera Tube (Videcon)

P826/4478

4493

Camera Tube (Videcon)

P893/4493

4494

Camera Tube (Videcon)

P894/4494

4495

Camera Tube (Videcon)

P894/4495

44A/160M

B9G	1	2	3	4	5	6	7	8	9
	h	g1(1)	k	a(1)	g2	a(2)	k	g1(2)	h

 
Double Beam Tetrode

Tetrode

Vh

Ah

Va

Vs

Vg

mAa

mAs

mAg

Pdriv

Pdiss

Pout

freq

f.max

6.3

1.6

300

175

-50

120

14

2.5

0.3W

15W

24W

160

250

 
CV0415 TT15

44-IU

1937

B4	1	2	3	4
	a(1)	a(2)	f	f

 
Rectifier FW

Rectifier	Vh	Ah	Va	mAa
	4.0	2.3	500	120

 
CV1039 UU5

44-SU

1930

Rectifier HW

45-IU

1939

B4	1	2	3	4
	a(1)	a(2)	h,k	h

 
Rectifier FW

Rectifier	Vh	Ah	Va	mAa
	4.0	3.5	500	250

 
FW4-500

45

1936

UX4	1	2	3	4
	f	a	g1	f

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	rl	gm	Pout
	2.5	1.5	275	-56	36.0	1,700	4,600	2.0	2W

 
CV0610

451

CV3585

451PT

B8A	1	2	3	4	5	6	7	8
	h	a	ic	ic	g2	g1	k,g3	h

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	45.0	0.1	170	170	-10.4	53	10	20,000	9.5

 
45A5 N142 UL41

45A5

B8A	1	2	3	4	5	6	7	8
	h	a	ic	ic	g2	g1	k,g3	h

 
Pentode

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	45.0	0.1	170	170	-10.4	53	10	20,000	9.5

 
CV1977 N142 UL41 451PT

45B5

B9A	1	2	3	4	5	6	7	8	9
	ic	g1	k,g3	h	h	ic	a	ic	g2

 
Pentode

Beam Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pdiss	Pout	D
	45	0.1	170	170	-12.5	70	5	230k	10	12.0W	5.2	10%

 
10P18 N119 UL84

45IU

1939

B4	1	2	3	4
	a(1)	a(2)	f	f

 
Rectifier FW

Rectifier	Vh	Ah	Va	mAa
	4.0	3.0	500	250

 
AU1 CV1264 CV2529 FW4-500 NU12 U18/20

45Z3

1940

Rectifier HW

45Z5GT

Rectifier HW

CV2530

46

1933

UX5	1	2	3	4	5
	f	a	g1	g2	f

 
Dual Grid Amplifier

Tetrode	Vh	Ah	Va
	2.5	1.75	400

 
CV2531

460BU

1931

B4	1	2	3	4
	a(1)	a(2)	f	f

 
Rectifier FW

Rectifier	Vh	Ah	Va	mAa
	4.0	2.3	500	120

 
UU5

4643

Triode

464A

IO	1	2	3	4	5	6	7	8	tc
	ic	h	k	-	k	-	h	k	a

 
Triode

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	μ
	6.3	0.8	250	-	20.0	6,000	8.0	48

 
2C43 CV0688

4685

Tetrode

4687

1959

Ct8	1	2	3	4	5	6	7	8
	-	-	-	-	k	-	-	a

 
Tetrode

Stabiliser	Va	mAa
	100	10.0-40.0

 
 

4687A

B4	1	2	3	4
	a	k	-	-

 
Tetrode

Stabiliser	Va	mAa
	100	10.0-40.0

 
 

4699

Pentode

EL54

47

UX5	1	2	3	4	5
	f+	a	g1	g2	f-

 
Voltage Stabiliser

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	rk	rl	Pout
	2.5	1.75	250	250	-16.5	31.0	6.0	60,000	2.5	450	7,000	2.7W

 
 

48

1936

Tetrode

484V

1931

B5	1	2	3	4	5
	a	g1	f	f	k,m

 
Triode

Triode	Vh	Ah	Va	Vg	ra	gm	μ
	4.0	1.0	200	0	21,800	2.2	48

 
 

485

1940

Triode

49

1936

UX5	1	2	3	4	5
	f+	a	g1	g2	f-

 
Tetrode

Tetrode	Vh	Ah
	2.0	0.12

 
CV2532