DH3-91 / CV2302 CRT
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The CRT measures 96x28mm overall, and 25mm across the screen. It has an 8 pin base. |
| Heater voltage | 6.3V |
| Heater current | 300mA |
| Max A3 voltage | 1000V |
| Min A3 voltage | 350V |
| Max heater/cathode voltage | 250V |
| Average X-plate sensitivity | 95/Va3 mm/V |
| Average Y-plate sensitivity | 110/Va3 mm/V |
| Pin | Function |
| 1 | Heater |
| 2 | A1, A3, Y2 and conductive coating |
| 3 | Y1 |
| 4 | X2 |
| 5 | Grid |
| 6 | X1 |
| 7 | Cathode and A2 |
| 8 | Heater |
With the CRT mounted horizontally with pin 5 uppermost, a positive voltage applied to pin 6 deflects the spot horizontally to the left and a positive voltage applied to pin 3 deflects it vertically upwards.
Trace brightness and definition decrease rapidly with decreasing A3 voltage, so a minimum of 350V is recommended. However a voltage as low as 250V may be used if the ambient light level is low. NB in such conditions the brightness of the trace should be kept low as low-energy electron beams are particularly liable to burn the screen.
