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Valve Types and Equivalents

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Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U10
Rectifier FW
1930
B4
1821 506BU CV1443 DW2 R1 UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U101
Rectifier HW

B8B

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U107
Rectifier HW
1952
B7G

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U118
Rectifier HW
1947

U145 U404

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U119
Rectifier HW

38A3 U381 UY85

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U120/500
Rectifier HW
1930

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U12
Rectifier FW
1931
B4
43IU DW4/350 R2 R3 R4 RV120/500 U14 UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U12/14
Rectifier FW
1939
B4
AU4 CV1064 CV1796 DW4-500 DW4/350 NU3 R4 UU120/350 VU64

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U134
Rectifier 2 x HW
1939

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U14
Rectifier FW
1931
B4
1561 43IU 442BU 460BU DW3 DW4 DW4-500 R2 R3 R4 R42 RV120/350 RV120/500 S11D UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U142
Rectifier HW
1947
B8A
311SU 31A3 UY41

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U143
Rectifier FW
1949
IO
AZ31 CV2862

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U145
Rectifier HW
1947

U118 U404

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U147
Rectifier FW
1950
IO
6X5GT EZ35 U70

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U149
Rectifier HW
1950
B8B
7Y4 U82

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U15
Rectifier HW
1934
L4
AU12 CV1266 CV3747 NU13 RZ1-250

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U15(HV)
Rectifier HW

CV1266

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U150
Rectifier FW

EZ40 UU9

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U151
Rectifier HW
1952

6X2 EY51 R12 SU61 U43

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U152
Rectifier HW

19X3 PY80 U309

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U153
Rectifier HW
1953
B9A
17Z3 PY81 U153 U329

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U154
Rectifier HW

19SU 19Y3 PY82 U192 U319

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U16
Rectifier HW
1933
B4
HVR1 SU2150

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U17
Rectifier HW
1936
B4
AU4 CV1113 NU18 VU113

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U18
Rectifier HW
1936

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U18/20
Rectifier FW
1939
B4
4/100BU 45IU AU1 CV31 CV1264 FW4-500 FW4-800 NU12 RV200/600

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U19
Rectifier HW
1947
B4
CV187 CV1508 U23 V1913 VU508

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U19/23
Rectifier HW
1948

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U191
Rectifier HW

IO
19CS4 PY301 U339

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U192
Rectifier HW

19SU 19Y3 PY82 U154 U319

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U193
Rectifier HW
1960
B9A
A61 PY801 U349

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U193/PY801
Rectifier HW
1960
B9A
A61 PY801 U349

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U20
Rectifier FW
1939

CV31 FW4-800

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U201
Rectifier HW
1948
IO
CY31

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U21
Rectifier HW
1937
B4
CV3751 SU2150

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U22
Rectifier HW
1939
MO
AU8 CV1356 CV1461 CV3750

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U23
Rectifier
1948
B4
CV235

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U24
Rectifier HW
1948
IO
CV1921

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U25
Rectifier EHT

2L2 KY50 U47

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U251
Efficiency Diode

B9A
U329

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U26
Rectifier EHT

B9A
2J2 KY80 R20 U49

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U27
Rectifier HW

19G/12 2T/360B AU5 CV1111 R11 V1907 VU111

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U281
Efficiency Diode
1950
IO
CY31 OM1

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U282
Efficiency Diode

IO

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U291
Rectifier HW

IO
PY32 PY33

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U3
Rectifier HW
1925

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U30
Rectifier FW
1934
B7
CV3752

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U30/250
Rectifier HW
1929

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U301
Rectifier HW
1953
IO
CY30

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U31
Rectifier HW
1937
IO
25Z4 CV3753

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U319
Rectifier HW
1953
B9A
19Y3 PY82 U192

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U329
Rectifier HW

B9A
PY81 U251

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U33
Rectifier EHT

B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U339
Rectifier HW

IO
19CS4 PY301 U191

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U349
Rectifier HW

A61 PY801 U193

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U35
Rectifier EHT

IO

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U37
Rectifier EHT
1950
1T2 CV2289 CV4061 R16

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U381
Rectifier HW
1954
B9A
38A3 U119 UY85

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U4
Rectifier HW
1926

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U4020
Rectifier HW
1934
B5
1D5 40SUA C10B CV764 CV1267 ID5 RZ UR1C V20

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U403
Rectifier HW
1938
MO

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U404
Rectifier HW
1947
B8A
U118 U145

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U41
Rectifier EHT

1B3GT CV2115

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U43
Rectifier HW
1954

6X2 CV426 EY51 R12 SU61

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U45
Rectifier EHT

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U47
Rectifier EHT

2L2 KY50 U25

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U49
Rectifier EHT

2J2 KY80 R20 U26

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U4B
Rectifier

CV141

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U5
Rectifier FW
1926
B4
CV3743

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U50
Rectifier FW
1937
IO
5Y3G 5Y3G/GT CV1268 CV3754

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U52
Rectifier FW
1938
IO
5U4G CV575 CV1071 CV1575 GZ31 VU71

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U54
Rectifier FW

53KU GZ33 GZ37

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U6
Rectifier HW

CV3744

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U60
Rectifier EHT

IO
CV4075

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U60/500
Rectifier HW
1930

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U600
Tungar Rectifier
1960

68530 CV3756

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U625
Rectifier HW
1930
B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U650
Rectifier HW
1930

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U65/550
Rectifier HW
1929

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U7
Rectifier

CV147 CV149

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U70
Rectifier FW
1939
IO
6X5G/GT 6X5GT 6X5G EZ35 U147

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U709
Rectifier FW

6CA4 CV3996 EZ81 UU12

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U71
Rectifier HW
1939

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U718
Rectifier FW

6BT4 EZ40 U150 UU9

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U74
Rectifier FW
1945
IO
35Z4GT U76

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U75/300
Rectifier HW
1929

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U76
Rectifier FW
1946
IO
35Z4GT U74

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U78
Rectifier FW
1952
B7G
6063 6X4 CV493 CV4005 EZ90

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U8
Rectifier FW
1928
B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U801
Rectifier HW
1950
IO

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U81
Rectifier FW
1950
B8B

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U82
Rectifier HW
1948

7Y4 CV3919 U149

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U84
Rectifier FW
1947
B8B

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U9
Rectifier FW
1929

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

U920
Triode
1932
B5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UA-55
Double Beam Tetrode
1947

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UABC80
Triple Diode Triode
1952
B9A
10LD12 28AK8 DH109

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UAF41
Diode Pentode
1948

12S7 UAF42 WD142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UAF42
Diode Pentode
1948
B8A
12S7 WD142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UB41
Double Diode

B8A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UBC41
Double Diode Triode
1949
B8A
10LD3 141DDT 14L7 DH118 DH142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UBC81
Double Diode Triode
1954
B9A
10LD13 DH119

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UBF11
Double Diode Pentode
1939
Footless

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UBF80
Double Diode Pentode
1950
B9A
171DDP 17C8

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UBF89
Double Diode Pentode
1956
B9A
10FD12 19FL8 WD119

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UBL21
Double Diode Pentode
1941
B8B
UBL71

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UC92
Triode
1952
B7G
9AB4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCC84
Double Triode
1954
B9A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCC85
Double Triode
1954
B9A
10L14 26AQ8 B109

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCF80
Triode Pentode
1958
B9A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCH11
Triode Heptode
1939
Footless

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCH21
Triode Heptode
1941
B8B

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCH42
Triode Heptode
1948
B8A
141TH 14K7 X142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCH81
Triode Heptode
1953
B9A
10C14 19D8 X119

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCL81
Triode Pentode
1949

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCL82
Triode Pentode
1956
B9A
10PL12 50BM8 LN119

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UCL83
Triode Pentode
1955
B9A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UD2
Triode
1927
B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UD41
Voltage Doubler
1937

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UE311
Triode

211 242C 4242A CV25 ES85

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UF41
Pentode
1947
B8A
121VP 12AC5 W142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UF42
Pentode
1947
B8A
Z142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UF80
Pentode
1953
B9A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UF85
Pentode

B9A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UF86
Pentode

B9A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UF89
Pentode
1955
B9A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UHF Triode
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UL41
Pentode
1947
B8A
451PT 45A5 CV1977 MUL41 N142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UL42
Pentode
1948

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UL44
Pentode
1948
B8A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UL46
Pentode
1951
B8A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UL84
Pentode
1955
B9A
10P18 45B5 N119

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

ULL80
Double Pentode
1959

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UM11
Tuning Indicator
1940
Footless

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UM4
Tuning Indicator
1940
IO

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UM34
Tuning Indicator

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UM80
Tuning Indicator
1954
B9A
19BR5 Y119

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

Universal
Triode
1922

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

Universal Bivolt
Triode
1929
B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

Unknown

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR1
Rectifier HW
1934
Ct8

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR1C
Rectifier HW
1935
B5
1D5 40SUA C10B RZ U4020

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR2
Rectifier FW
1934
Ct8

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR3
Rectifier FW
1935
Ct8

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR30
Rectifier HW
1963

CV5225

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR3C
Rectifier FW
1935
B7
CV3758

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR40
Rectifier HW
1963

CV5226

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR41
Rectifier HW
1963

CV6092

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR42
Rectifier HW
1963

CV6119

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UR45
Rectifier HW
1963

CV4116

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU10
Rectifier FW

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU12
Rectifier FW
1954
B9A
6CA4 CV5072 EZ81 U709

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU120/250
Rectifier FW

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU120/350
Rectifier FW
1930

CV1796 DW4/350 R4 U12/14

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU120/500
Rectifier FW
1931
B4
R3 UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU2
Rectifier FW
1930

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU3
Rectifier FW
1934
B4
IW4-350 R2

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU30/250
Rectifier FW
1931

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU4
Rectifier FW
1936
B4
1867 CV3759 IW4-350 MU12 MU14 R2 R42

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU41
Rectifier FW
1930

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU42
Rectifier FW
1934

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU43
Rectifier FW
1934

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU5
Rectifier FW
1936
B4
1561 1821 1867 1867 43IU 441U 442BU 460BU 506BU A11B A11C A11D APV4 APV4 CV1039 CV3760 DW2 DW4-500 DW4/350 IW4-350 IW4-500 MU12 MU14 R1 R2 R3 R42 R4A U10 U12 U14 UU120/350 UU120/500 UU60/250

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU6
Rectifier FW
1938
MO
CV1413

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU60/250
Rectifier FW
1929
B4
R2 R42 UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU7
Rectifier FW
1938
MO
CV3761

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU8
Rectifier FW
1939
MO

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UU9
Rectifier FW
1948
B8A
66KU 6BT4 CV1855 EZ40 U150 U718

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UV201
Triode
1920

201

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UV201A
Triode
1922

201A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UVV4A
Photocell

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UX112A
Triode
1937
UX4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UX201A
Triode
1922
UX4
201A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UX222
Bi-Grid
1927
UX4
222 57T222 CX322 SX222 x222

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UX281
Rectifier HW
1928
UX4
281 AC81

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY227
Triode
1927

127 227 27 427 AY225 AY227 C327 F209A G-27 PH227 PU027

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY-227
Triode
1927
UY
UY227

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY1N
Rectifier HW
1941
IO

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY21
Rectifier HW
1941
B8B

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY-224
Tetrode
1929
UY
124 224 24 F242 FY224 G-24 MY224 PU024 SY224 UY224

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY224
Tetrode
1929

124 224 24 F242 FY224 G-24 MY224 PU024 SY224 UY-224

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY31
Rectifier HW
1940

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY41
Rectifier HW
1948
B8A
311SUA 311SU 31A3 U142

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

UY85
Rectifier HW
1954
B9A
38A3 U119 U381

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