STC CV1883 / 4H/182E RF tetrode
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This valve measures 138x80mm overall and has an 8-pin base |
Note the CV Register and the EVS data for this valve suggests it is a 4H/180E but this valve and its box are clearly marked 4H/182E.
| Filament voltage | 5V |
| Filament current | 22.5A |
| Filament usable emission | 5A |
| Mutual conductance * | 10mA/V |
| Inner amplification factor * | 3.5 |
| Max direct anode voltage | 2kV |
| Max direct anode current | 300mA |
| Max anode dissipation | 330W |
| Max direct screen voltage | 250V |
| Max direct screen dissipation | 20W |
| Max direct grid dissipation | 20W |
| Max frequency for above ratings | 110MHz |
| Capacitances (measured with a 12" square metal plate fitted to the screen grid terminal) | |
| Cin | 36pF |
| Cout | 13pF |
| Ca,g1 | 0.15pF |
*: At Va=1kV, Vg2=500V, Vg1=-30V
| Pin | Function |
| 1 | Filament 1 |
| 2 | Control grid |
| 3 | Filament 2 |
| 4 | Control grid |
| 5 | Filament 1 |
| 6 | Control grid |
| 7 | Filament 2 |
| 8 | Control grid |
| Shell around base | Screen grid |
| Finned radiator | Anode |
Base view: the filament and control grid take alternate pins, the screen grid is the metal shell around the base.