| 12SF5 | Triode | 068 | 12.6 | 0.15 | 250 | – | –2.0 | – | 0.9 | – | 1.5 | 66 000 | – | – | – |
| 12SG7 | HF Pentode | 069 | 12.6 | 0.15 | 250 | 150 | –2.5 | – | 9.2 | 3.4 | 4.0 | 1 meg. | – | – | – |
| 12SJ7 | HF Pentode | 070 | 12.6 | 0.15 | 250 | 100 | –3.0 | – | 3.0 | 0.8 | 1.65 | 1.5 meg. | – | – | – |
| 12SK7 | HF Pentode | 070 | 12.6 | 0.15 | 250 | 100 | –3.0 | – | 9.2 | 3.4 | 1.65 | 1.5 meg. | – | – | – |
| 12SQ7 | DD Triode | 071 | 12.6 | 0.15 | 250 | – | –2.0 | – | 0.8 | – | 1.1 | 91 000 | – | – | – |
| 12SR7 | DD Triode | 071 | 12.6 | 0.15 | 250 | – | –9.0 | – | 9.5 | – | 1.9 | 8500 | – | – | – |
| 12Z3 | Rectifier | 4UX10 | 12.6 | 0.3 | RMS 250 | – | – | – | – | – | – | – | – | 60 mA | – |
| 14A4 | Triode | OL19 | 12.6 | 0.15 | 250 | – | –8.0 | – | – | – | – | 7700 | – | – | – |
| 14A5 | Beam Power Output | OL16 | 12.6 | 0.15 | 250 | 250 | –12.5 | – | 30.0 | 3.5 | 50 000 | – | – | – | |
| 14A7/12B7 | HF Pentode | OL12 | 12.6 | 0.15 | 250 | 100 | –3.0 | – | 9.2 | 2.6 | 2.0 | 800 000 | – | – | – |
| 14B8 | Pentagrid | OL13 | 12.6 | 0.15 | 250 | 100 | –3.0 | – | 3.5 | 2.7 | *550 | 360 000 | – | – | – |
| 14C7 | HF Pentode | OL12 | 12.6 | 0.15 | 250 | 100 | –3.0 | – | 2.2 | 0.7 | 1.575 | 1 meg. | – | – | – |
| 14 F7 | Double Triode | OL18 | 12.6 | 0.15 | 250 | – | –2.0 | – | 2.3 | – | 1.6 | 44 000 | – | – | – |
| 15 | HF Pentode | 5UX8 | 2.0 | 0.22 | 135 | 67.5 | –1.5 | – | 1.85 | 0.3 | 80 0000 | 600 | – | – | – |
| 18 |
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