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Tube Data (12")
| Size | Make | Type | Heater | Gun | Neck dia. | Def. angle | Base | Notes | | 12" | Brimar | C12A | 2V 1.4A | Triode | 35mm | 57deg | MO(5) | Mag | | 12" | Mazda | CRM121 | 2V 1.4A | Triode | 35mm | 57deg | MO(5) | Mag | | 12" | Mazda | CRM121A | 2V 1.4A | Triode | 35mm | 57deg | MO(5) | Mag | | 12" | Mazda | CRM121B | 2V 1.4A | Triode | 35mm | 57deg | MO(5) | Mag | | 12" | Ferranti | T12/91 | 2V 1.5A | Triode | 35mm | ? | K(4) | Mag | | 12" | Ferranti | T12/92 | 2V 1.5A | Triode | 35mm | ? | K(4) | Mag,EC | | 12" | Mazda | CRM123 | 2V 1.4A | Triode | 35mm | 57deg | MO(5) | Mag,AL | | 12" | Brimar | C12B | 2V 2.5A | Triode | 35mm | ? | K(4) | Mag,AL | | 12" | Brimar | C12D | 2V 2.5A | Triode | 35mm | ? | K(4) | Mag,AL |
| Size | Make | Type | Heater | Gun | Neck dia. | Def. angle | Base | Notes | | 12" | Emiscope | 6/6 | 4V 1.3A | Hexode | ? | 40deg | 7-pin split | ES |
| Size | Make | Type | Heater | Gun | Neck dia. | Def. angle | Base | Notes | | 12" | Ferranti | T12/2 | 4V 1A | Triode | ? | ? | K(4) | Mag | | 12" | Ferranti | T12/44 | 4V 0.95A | Triode | ? | ? | K(4) | Mag | | 12" | Ferranti | T12/449 | 4V 0.95A | Triode | 35mm | ? | K(4) | Mag | | 12" | Ferranti | T12/54 | 4V 0.95A | Triode | 35mm | ? | K(4) | Mag,EC | | 12" | Ferranti | T12/549 | 4V 0.95A | Triode | 35mm | ? | K(4) | Mag,EC | | 12" | Ferranti | T12/504 | 4V 0.95A | Triode | 35mm | ? | K(4) | Mag,EC,AL | | 12" | Ferranti | T12/404 | 4V 0.95A | Triode | 35mm | ? | K(4) | Mag,AL |
| Size | Make | Type | Heater | Gun | Neck dia. | Def. angle | Base | Notes | | 12" | Ferranti | T12/56 | 6.3V 0.6A | Triode | 35mm | ? | K(4) | Mag,EC | | 12" | Ferranti | T12/46 | 6.3V 0.6A | Triode | 35mm | ? | K(4) | Mag | | 12" | Brimar | C12E | 6.3V 0.6A | Triode | 35mm | ? | K(4) | Mag | | 12" | Mullard | MW31-7 | 6.3V 0.6A | Tetrode | 35mm | 60deg | B8G | Mag | | 12" | Mullard | MW31-14C | 6.3V 0.3A | Tetrode | 35mm | 60deg | B8G | Mag | | 12" | Mullard | MW31-20 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B8G | Mag | | 12" | Mullard | MW31-14 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B8G | Mag,EC | | 12" | Mullard | MW31-21 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B8G | Mag,EC | | 12" | Mullard | MW31-18 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC | | 12" | Mullard | MW31-23 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC | | 12" | Mullard | MW31-17 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag | | 12" | Mullard | MW31-22 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag | | 12" | Cossor | 112K | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag | | 12" | Brimar | C12FM | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Cathodeon | C12/1 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Cossor | 121K | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Emitron | 12XP4 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Ferranti | T12/100 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Mullard | MW31-16 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Mullard | MW31-74 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Pinnacle | P12 | 6.3V 0.3A | Tetrode | 35mm | 60deg | B12A | Mag,EC,IT | | 12" | Emitron | 12XP4A | 6.3V 0.3A | Tetrode | 35mm | ? | B12A | Mag,EC,IT | | 12" | Mazda | CRM124 | 12.6V 0.3A | Tetrode | 35mm | 57deg | B12A | Mag,EC,IT,AL |
| Size | Make | Type | Heater | Gun | Neck dia. | Def. angle | Base | Notes | | 12" | Mazda | CRM122 | 7.5V 0.3A | Triode | 35mm | 57deg | MO(5) | Mag | | 12" | Ferranti | T12/71U | 8V 0.3A | Triode | 35mm | ? | K(4) | Mag,EC | | 12" | Ferranti | T12/72U | 8V 0.3A | Triode | 35mm | ? | K(4) | Mag,EC | | 12" | Ferranti | T12/82U | 8V 0.3A | Triode | 35mm | ? | K(4) | Mag,AL | | 12" | Ferranti | T12/81U | 8V 0.3A | Triode | 35mm | ? | K(4) | Mag,EC,AL | | 12" | Emiscope | 3/18 | 8.5V 0.3A | Triode | ? | ? | 7-pin(2) | Mag,AL | | 12" | Emiscope | 3/31 | 8.5V 0.3A | Triode | ? | ? | 7-pin(2) | Mag,AL | | 12" | GEC | 6704A | 10.5V 0.3A | Triode | 35mm | ? | K(4) | Mag,EC,AL | | 12" | GEC | 6706A | 10.5V 0.3A | Triode | 35mm | ? | K(4) | Mag,EC,AL |
Tube Bases |
2.5 - 10" |
14" - 16" |
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