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Code chart for TESLA tubes (1947-1984)
Code
Mon
Year
Code
Mon
Year
Code
Mon
Year
Code
Mon
Year
Code
Mon
Year
FD
1
1947
BT
1
1951
QU
1
1955
YM
1
1959
UA
1
1963
FH
2
1947
BU
2
1951
QV
2
1955
YN
2
1959
UB
2
1963
FL
3
1947
BV
3
1951
QW
3
1955
YO
3
1959
UC
3
1963
DR
4
1947
FP
4
1951
UO
4
1955
EW
4
1959
AM
4
1963
DS
5
1947
FQ
5
1951
UP
5
1955
EX
5
1959
AN
5
1963
DT
6
1947
FR
6
1951
UQ
6
1955
EY
6
1959
AO
6
1963
AA
7
1947
KL
7
1951
YA
7
1955
LD
7
1959
GR
7
1963
AF
8
1947
KM
8
1951
YB
8
1955
LE
8
1959
GS
8
1963
AH
9
1947
KN
9
1951
YC
9
1955
LF
9
1959
GT
9
1963
GL
10
1947
OG
10
1951
CK
10
1955
RR
10
1959
NU
10
1963
GM
11
1947
OH
11
1951
CL
11
1955
RS
11
1959
NV
11
1963
GN
12
1947
OJ
12
1951
CM
12
1955
RT
12
1959
NW
12
1963
IA
1
1948
SC
1
1952
HT
1
1956
XA
1
1960
TD
1
1964
IB
2
1948
SD
2
1952
HU
2
1956
XB
2
1960
TE
2
1964
IC
3
1948
SE
3
1952
HV
3
1956
XC
3
1960
TF
3
1964
KH
4
1948
GX
4
1952
LG
4
1956
DO
4
1960
ZX
4
1964
KJ
5
1948
GY
5
1952
LH
5
1956
DP
5
1960
ZY
5
1964
KK
6
1948
GZ
6
1952
LJ
6
1956
DQ
6
1960
ZZ
6
1964
PB
7
1948
AU
7
1952
ZD
7
1956
KU
7
1960
FA
7
1964
PC
8
1948
AV
8
1952
ZE
8
1956
KV
8
1960
FB
8
1964
PD
9
1948
AW
9
1952
ZF
9
1956
KW
9
1960
FC
9
1964
NB
10
1948
ER
10
1952
TW
10
1956
QJ
10
1960
SJ
10
1964
ND
11
1948
ES
11
1952
TX
11
1956
QK
11
1960
SK
11
1964
NF
12
1948
ET
12
1952
TY
12
1956
QL
12
1960
SL
12
1964
BA
1
1949
JN
1
1953
AB
1
1957
WE
1
1961
YP
1
1965
BC
2
1949
JO
2
1953
AC
2
1957
WF
2
1961
YQ
2
1965
BE
3
1949
JP
3
1953
AD
3
1957
WG
3
1961
YR
3
1965
HF
4
1949
NJ
4
1953
GA
4
1957
CS
4
1961
EG
4
1965
HG
5
1949
NK
5
1953
GB
5
1957
CT
5
1961
EH
5
1965
HJ
6
1949
NL
6
1953
GC
6
1957
CU
6
1961
EJ
6
1965
EK
7
1949
RD
7
1953
NX
7
1957
JH
7
1961
LS
7
1965
EM
8
1949
RE
8
1953
NY
8
1957
JJ
8
1961
LT
8
1965
EO
9
1949
RF
9
1953
NZ
9
1957
JK
9
1961
LU
9
1965
LP
10
1949
VA
10
1953
TG
10
1957
PN
10
1961
RN
10
1965
LQ
11
1949
VB
11
1953
TH
11
1957
PO
11
1961
RO
11
1965
LW
12
1949
VC
12
1953
TJ
12
1957
PP
12
1961
RP
12
1965
CE
1
1950
ZR
1
1954
ZK
1
1958
VK
1
1962
DW
1
1966
CG
2
1950
ZS
2
1954
ZL
2
1958
VL
2
1962
DX
2
1966
CO
3
1950
ZT
3
1954
ZM
3
1958
VM
3
1962
DY
3
1966
OP
4
1950
DL
4
1954
FT
4
1958
BB
4
1962
XD
4
1966
OR
5
1950
DM
5
1954
FU
5
1958
BD
5
1962
XE
5
1966
OS
6
1950
DN
6
1954
FV
6
1958
BF
6
1962
XF
6
1966
MT
7
1950
SX
7
1954
MP
7
1958
HQ
7
1962
KR
7
1966
MU
8
1950
SY
8
1954
MQ
8
1958
HR
8
1962
KS
8
1966
MV
9
1950
SZ
9
1954
MR
9
1958
HS
9
1962
KT
9
1966
VX
10
1950
MD
10
1954
SF
10
1958
OD
10
1962
QA
10
1966
VY
11
1950
ME
11
1954
SG
11
1958
OE
11
1962
QB
11
1966
VZ
12
1950
MF
12
1954
SH
12
1958
OF
12
1962
QC
12
1966
XU
1
1967
JD
1
1971
QM
1
1975
ED
1
1979
YS
1
1983
XV
2
1967
JE
2
1971
QN
2
1975
EE
2
1979
YT
2
1983
XW
3
1967
JF
3
1971
QO
3
1975
EF
3
1979
YU
3
1983
AJ
4
1967
UL
4
1971
BG
4
1975
IU
4
1979
HN
4
1983
AK
5
1967
UM
5
1971
BH
5
1975
IV
5
1979
HO
5
1983
AL
6
1967
UN
6
1971
BJ
6
1975
IW
6
1979
HP
6
1983
MX
7
1967
EA
7
1971
ZU
7
1975
LX
7
1979
DD
7
1983
MY
8
1967
EB
8
1971
ZV
8
1975
LY
8
1979
DE
8
1983
MZ
9
1967
EC
9
1971
ZW
9
1975
LZ
9
1979
DF
9
1983
TA
10
1967
WU
10
1971
JX
10
1975
GO
10
1979
KX
10
1983
TB
11
1967
WV
11
1971
JY
11
1975
GP
11
1979
KY
11
1983
TC
12
1967
WW
12
1971
JZ
12
1975
GQ
12
1979
KZ
12
1983
BM
1
1968
AX
1
1972
SP
1
1976
XJ
1
1980
IL
1
1984
BN
2
1968
AY
2
1972
SQ
2
1976
XK
2
1980
IM
2
1984
BO
3
1968
AZ
3
1972
SR
3
1976
XL
3
1980
IN
3
1984
KD
4
1968
NA
4
1972
LK
4
1976
OA
4
1980
BP
4
1984
KE
5
1968
NC
5
1972
LL
5
1976
OB
5
1980
BQ
5
1984
KF
6
1968
NE
6
1972
LM
6
1976
OC
6
1980
BR
6
1984
YG
7
1968
HK
7
1972
PE
7
1976
UV
7
1980
HW
7
1984
YH
8
1968
HL
8
1972
PF
8
1976
UW
8
1980
HX
8
1984
YJ
9
1968
HM
9
1972
PG
9
1976
UX
9
1980
HY
9
1984
OU
10
1968
RA
10
1972
DA
10
1976
QD
10
1980
FM
10
1984
OV
11
1968
RB
11
1972
DB
11
1976
QE
11
1980
FN
11
1984
OW
12
1968
RC
12
1972
DC
12
1976
QF
12
1980
FO
12
1984
FE
1
1969
MJ
1
1973
NG
1
1977
CX
1
1981
Unused codes
FF
2
1969
MK
2
1973
NH
2
1977
CY
2
1981
GD
GE
GF
FG
3
1969
ML
3
1973
NI
3
1977
CZ
3
1981
JR
JS
JT
RK
4
1969
VG
4
1973
BX
4
1977
ZG
4
1981
KO
KP
KQ
RL
5
1969
VH
5
1973
BY
5
1977
ZH
5
1981
LA
LB
LC
RM
6
1969
VJ
6
1973
BZ
6
1977
ZI
6
1981
MG
MH
MI
SM
7
1969
TN
7
1973
MM
7
1977
JU
7
1981
PX
PY
PZ
SN
8
1969
TO
8
1973
MN
8
1977
JV
8
1981
WR
WS
WT
SO
9
1969
TP
9
1973
MO
9
1977
JW
9
1981
ZO
ZP
ZQ
GG
10
1969
GU
10
1973
IR
10
1977
VQ
10
1981
GH
11
1969
GV
11
1973
IS
11
1977
VR
11
1981
GJ
12
1969
GW
12
1973
IT
12
1977
VS
12
1981
ZA
1
1970
CA
1
1974
KA
1
1978
NM
1
1982
ZB
2
1970
CB
2
1974
KB
2
1978
NN
2
1982
ZC
3
1970
CC
3
1974
KC
3
1978
NO
3
1982
QX
4
1970
FW
4
1974
WL
4
1978
UG
4
1982
QY
5
1970
FX
5
1974
WM
5
1978
UH
5
1982
QZ
6
1970
FY
6
1974
WN
6
1978
UJ
6
1982
DG
7
1970
XQ
7
1974
RG
7
1978
IG
7
1982
DH
8
1970
XR
8
1974
RH
8
1978
IH
8
1982
DJ
9
1970
XS
9
1974
RI
9
1978
IJ
9
1982
NR
10
1970
UD
10
1974
TK
10
1978
MA
10
1982
NS
11
1970
UE
11
1974
TL
11
1978
MB
11
1982
NT
12
1970
UF
12
1974
TM
12
1978
MC
12
1982
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