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Valve Types and Equivalents
    
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Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2-01C
UHF Diode
1958
EA53
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2A
Photocell
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2A3
Output Triode
1935
UX4
CV1831
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2A4G
Thyratron
1940
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2A5
Output Pentode
1932
UX6
CV1834
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2A6
Double Diode Triode
1933
UX6
A4006B CV1769 PH2A6 UZ2A6
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2A7
Heptode
1936
UX7
CV787
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2AHL
Triode
 
 
VT158
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2AP1
Cathode-Ray Tube
1944
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B
Barretter
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B21
Rectifier EHT
1939
 
2X2A 2X2 879 CV597
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B22
Planar Diode
1945
IO
559 CV2931 GL2B22 GL559
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B35
Diode
 
 
6D1 EA50
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B4
Thyratron
 
 
885 CV648
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B52
Tetrode (Power)
 
 
C1134
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B7
Double Diode Pentode
1936
 
CV1837
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2B94
Tetrode (Power)
 
 
C178A
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2BP1
Cathode-Ray Tube
 
 
CV3678
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C21
Double Triode
1943
 
1642 CV875 RK33
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C22
Triode
1943
 
7193 CV792
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C26
Triode
1943
 
CV802
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C26A
Triode
1944
IO
CV1759
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C34
Double Triode
1938
UX7
4074A CV18 DET19 RK34 VT-224
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C36
Triode
1946
CV3965 SB846
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C39
Triode
 
 
CV3940
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C39A
Triode
 
CV2516 TD1-100
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C40
Triode
1940
 
446B CV687 CV2643
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C40A
Triode
1961
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C42
Planar Triode
 
IO
CV2932 TD3-12
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C43
Triode
1945
IO
464A CV688
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C46
Triode
 
IO
CV2933
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C51
Double Triode
1960
B9A
396A 5670 CV2831
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2C51W
Double Triode
 
 
CV2866
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2CW4
Nuvistor Triode
1964
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D1
Rectifier FW
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D13
Double Diode
1934
Ct5
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D13A
Double Diode
1935
Ct5
DDA/13L
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D13C
Double Diode
1935
B5
10D1 ARDD1 CV796 CV1300 DDA/13 ZD
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D2
Diode
1937
B5
CV794
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D21
Thyratron
1944
B7G
20A3 4G/280K 5121 5727 ASG5121 CV797 E1955 EN91 G4S2 PL21 PL2D21 QX21 Ste1300/01/05 WT-210-0001
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D21W
Thyratron
 
 
CV2876
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D4
Double Diode
1934
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D4A
Double Diode
1934
B5
A20B D41 DDL4 TB24 V914
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2D4B
Double Diode
1937
B7
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2DS4
Nuvistor Triode
 
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2E22
Pentode
1945
UX5
CV798
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2E24
Beam Tetrode
1946
IO
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2E26
Beam Tetrode
1947
IO
CV3990
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2E30
Beam Tetrode
1949
 
CV2517
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2E5
Tuning Indicator
1937
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2G
Barretter
 
CV1842
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2G22P
Thyratron (Hydrogen)
 
 
8503
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2G5
Tuning Indicator
1937
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2G57
Thyratron (Mercury Vapour)
 
 
5557
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2GK5
Triode
1961
 
2FQ5A
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2HF
Double Bi Grid
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J2
Rectifier EHT
1958
 
U26
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J30
S Band Magnetron
1944
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J31
S Band Magnetron
 
 
CV1807
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J32
S Band Magnetron
 
 
CV1808
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J33
S Band Magnetron
 
 
CV1809
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J34
S Band Magnetron
 
 
CV1810
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J37
S Band Magnetron
1945
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J42
Magnetron (X-Band Pulse)
1957
 
CV3676
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J42H
Magnetron (X-Band Pulse)
 
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J55
Magnetron (X-Band Pulse)
1957
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J56
Magnetron (X-Band Pulse)
 
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J70
Magnetron (S-Band Pulse)
1955
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J70A
Magnetron (S-Band Pulse)
 
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2J70B
Magnetron (S-Band Pulse)
 
 
M5063
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2K25
Klystron (Oscillator)
 
IO
723A-B CV2792 KS9/20D
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2K28
Klystron (Oscillator)
 
 
K3033
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2K33
Klystron
 
IO
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2K41
Reflex Klystron
1941
 
417A CV2642 WL-417A
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2L2
Rectifier EHT
1959
 
U25
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2P
Triode
1939
B4
AC042 PA20 S30D
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2P(Gold Line)
Output Triode
1926
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2T/270K
Rectifier EHT
 
 
6305 CV261
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2V/400A
Rectifier HW
1952
UX4
3B28 866A AH201 CV32 ESU866 RG3-250A
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2V/531E
Rectifier MV
 
 
869B
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2V4
Pentode
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2VDE
Probably A DE2
1926
 
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2V.LF
Triode
 
B4
 
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2X2
Rectifier EHT
1939
UX4
2B21 2X2A 879 CV597 CV3748 VT-119
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2X2A
Rectifier EHT
1949
UX4
2B21 2X2 879 CV597
Type
Structure
Date
Base
PDF
Sensibly equivalent to:
2Y2
Rectifier HW
 
 
CV1843
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