Note:
Nominal values shown are characteristic of all minature tube TransOceanics.
With the exception of the 1LA6, all are 7 pin minature tubes.
All have 50 ma nominal filament current.
| Design Specification | 1L6 | 1LA6 Loctal | 1AC6 DK-92 CV5172 | 1R5 DK-91 |
|---|---|---|---|---|
| TransConductance Gm | 300 | 250 | 325 | 300 |
| Max. Plate V. (90 nom) | 110 | 110 | 90 | 90 |
| Max. Screen V. (42.5 nom.) | 65 | 65 | 90 | 67.5 |
| Max. Osc Plate V. (82 nom) | 90 | 90 | 60* | 67.5* (screen) |
| Plate Resist, (k ohm) | 650 | 750 | 650 | 600 |
| RF Input Imp. (uuf) | 7.5 | 7.7 | 7.5 | 7.0 |
| Osc. Input Imp. (uuf) | 2.2 | 2.9 | 4.0 | 3.8 |
| Osc. Grid Leak Res. (k ohm) | 200 | 200 | 27 | 100 |
Notes:
The pin 3 (oscillator plate) maximum voltage is exceeded on both the 1AC6 and the 1R5 (screen) which is connected to B+ through a 3300 ohm resistor. See James Duckworth note for answer.
It has been suggsted that for 1R5 operation it is beneficial to drop the oscillator grid leak resistor from 180k to 100k. The 1AC6 would also appear to benefit from this reduction.