CV4501 / VX8121 reliable HF pentode
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This valve measures 37x10mm overall and has a B8D base. |
This valve is based on CV465. The EVS data states (and also for CV4505) "Because of production difficulties these valves should not be used in new design work except possibly for Missile Airborne applications when, if semi-conductors cannot be used, these are the first choice technically. Before any decision to use them is taken the M.O.A. production branch (LP(T)3) must be consulted." - the issue in question dates from the early 1960's.
| Heater voltage | 6.3V |
| Heater current | 175mA |
| Max heater cathode voltage | 100V |
| Max anode voltage (Ia=0) | 350V |
| Max screen voltage (Ig2=0) | 350V |
| Max negative grid voltage | -100V |
| Max operating anode voltage | 190V |
| Max operating screen voltage | 190V |
| Max anode dissipation | 1W |
| Max screen dissipation | 0.4W |
| Max cathode current | 12mA |
| Max grid circuit resistance (fixed bias) | 250k ohms |
| Max grid circuit resistance (auto bias) | 500k ohms |
| Max vibration (100 hours duration max) | 5g |
| Max vibration (10 minutes duration max) | 20g |
| Max shock (short duration) | 500g |
| Max bulb temperature | 165C |
| Minimum operating pressure | 55mm Hg |
| Max ambient storage temperature | -60 to +85C |
| Typical operating conditions, at Va=Vg2=100, Vg1=-1.4 | |
| Anode current | 7mA |
| Screen current | 2.2mA |
| Mutual conductance | 5mA/V |
| Inner amplification factor | 36 |
| Capacitances (shielded) | |
| Cin nom | 4.5pF |
| Cout nom | 2.7pF |
| Cag1 max | 0.015pF |
| Lead | Function |
| 1 | Control grid |
| 2 | Cathode, suppressor grid and shield |
| 3 | Heater |
| 4 | Cathode, suppressor grid and shield |
| 5 | Anode |
| 6 | Heater |
| 7 | Screen grid |
| 8 | Cathode, suppressor grid and shield |
