This is a work in progress. It currently links to diagrams
from the K1001 specifications book. The linked images are full-size (but browsers often shrink them to fit the screen).
| B2A |
2 pin base used on GM
tubes |
| B2B |
2-pin base for photo-conductive
cells |
| B2G |
2-wire base |
| B3A |
American pee-wee 3-pin
base |
| B3B/A |
|
| B3D |
|
| B3D/F |
(transistor base) |
| B3G |
3-pin inline lead glass
base |
| B4 |
original British 4-pin
base |
| B4A |
American 4-pin base (CV398,
CV2752, CV2814 etc) |
| B4B |
4-pin base for phototubes |
| B4D |
American super jumbo 4-pin
base with bayonet |
| B4E |
4-clip base for CRTs |
| B4F |
American jumbo 4-pin base |
| BC4 |
4-pin base with bayonet |
| B5 |
British 5-pin base |
| B5A |
B5A/F base with leads
cut short to fit valve holder |
| B5A/F |
5-lead inline submin base
with flying leads |
| B5B |
B5B/F base with leads
cut short to fit valve holder |
| B5B/F |
5-lead button base with
flying leads |
| B5D |
American giant 5-pin base |
| B5E |
B5D with metal shell (Eimac
and RCA) |
| B5F |
Mullard and Philips version
of B5D |
| B5G |
B5G/F base with leads
cut short to fit valve holder |
| B5G/F |
American 5-lead inline
submin base with flying leads |
| B5H |
|
| B5H/F |
5-lead inline flat miniature
base (Hivac) |
| B5J |
|
| B5J/F |
Pressed glass electrometer
base (Mullard) |
| B5K |
5-pin super giant base
(Philips) |
| B7 |
British 7 pin base |
| B7A |
American Septar 7-pin
base |
| B7B |
7-pin CRT base (EMI) |
| B7D |
American medium shell
giant 7-pin base with bayonet |
| B7E/F |
American 7-lead inline
flat submin base |
| B7G |
small button miniature
7-pin base |
| B7G/A |
welded lead version of
B7G (STC) |
| B7G/B |
welded lead version of
B7G (GPO) |
| B7G/F |
B7G with flying leads
instead of pins |
| B8A |
Rimlock 8-pin base with
location boss |
| B8B |
8-pin glass base |
| B8D |
B8D/F with leads cut short
to fit valve base |
| B8D/F |
8-lead circular submin
base with flying leads |
| B8E |
8-pin CRT base (was EM8) |
| B8F |
American 8-pin base used
on CV2519 (4X150A) |
| B8G |
8-pin locking-in base |
| B8G/F |
B8G with flying leads |
| B8-MO |
Mazda Octal |
| B8-O |
Octal |
| B9 |
British 9-pin base |
| B9A |
9-pin noval base |
| B9A/B |
welded lead version of
B9A (GPO) |
| B9A/D |
B9A with central exhaust
tabulation (Mullard) |
| B9A/F |
B9A base with flying leads |
| B9B |
9-pin base for vibrators |
| B9G |
9-pin glass base |
| B9G/B |
welded lead version of
B9G (GPO) |
| B10A |
|
| B10A/A |
10-pin glass base with
welded leads (STC) |
| B11A |
American 11-pin sub-magnal
base |
| B12A |
American 12-pin duodecal
base |
| B12B |
12-pin spigot base |
| B12D |
12-pin side contact CRT
base with key |
| B12E |
B12A base with cap on
spigot |
| B12F |
12-pin glass base for
CRT (Electronic Tubes Ltd) |
| B12G |
12-pin glass base for
CRT (EMI) |
| B14A |
American Diheptal 14-pin
base |
| B14B |
14-pin pressed glass base
for CRT |
| B15A3 |
3-pin base (formerly 3-pin
quindecal) used on CV339 |
| B15B |
15-pin glass base (EMI,
used on photomultipliers) |
| B22 |
bayonet cap |
| BC4 |
medium 4-pin bayonet base |
| CK12 |
see B12D |
| CL3 |
3-clip base |
| CL6 |
6-clip base |
| CL7 |
7-clip base |
| EL4B |
large 4-pin base |
| EM8 |
see B8E |
| ES |
medium Edison screw base |
| GES |
goliath Edison screw base |
| IO |
international octal –
known as O base or B8-O |
| I/S1 |
Interservices base. Pointed bottom cap, pointed cap at the other
end of the bulb, two side contacts. Example: NR14 |
| I/S2 |
Interservices base. Two long side contacts and two bottom contacts.
Example NR14A |
| I/S3 |
Interservices base. Similar to I/S2 but with three bottom contacts. |
| I/S4 |
Interservices base. Two side pins and two bottom pins. Example AR3
(also uses I/S2 base) |
| L4 |
4-pin low loss base. Example
DET1. |
| MES |
miniature Edison screw
base |
| MO |
Mazda octal base B8-MO |
| PB8 |
8-pin bayonet base |
| PS10 |
spigot base see B12B |
| PS12 |
spigot base see B12B |
| S3 |
Interservices base with three claw-like feet providing electrical
connections. Example AT50. |
| SC8 |
8-pin side contact base |
| SES |
small Edison screw base |
| T4 |
4-pin metal shield base |
| USD12 |
American Diheptal base
see B14A |
| USD14 |
American Diheptal base
see B14A |
| USG5 |
American giant 5-pin base
with bayonet now B5D |
| USG7 |
American giant 7-pin base
with bayonet now B7D |
| USL4 |
American large 4-pin base
see CV1506 spec |
| USM4 |
American medium 4-pin
base A4-9 |
| USM4B |
American medium 4-pin
bayonet base A4-10 |
| USM5 |
American medium 5-pin
base A5-11 |
| USM5B |
American USM5 base with
bayonet pin (see CV2595 spec) |
| USM6 |
American medium 6-pin
base A6-12 |
| USM7 |
American medium 7-pin
base A7-13 |
| USM11 |
American Magnal 11-pin
base B11-33 and B11-66 |
| USS4 |
American small 4-pin base
A4-5 |
| USS5 |
American small 5-pin base
A5-6 |
| USS6 |
American small 6-pin base
A6-7 |
| USS7 |
American small 7-pin base
A7-18 |
| USSM11 |
American sub-Magnal base
now B11A |
