Transmitting valves; AAnnAA
format (e.g. RD150YB)
| 1st Letter |
| R |
Transmitting
valves |
| Z |
Special amplifying
and modulating valves |
| 2nd Letter |
| A |
Diode |
| D |
Triode |
| E |
Tetrode |
| Figures indicate
dissipation in W or kW; if the letter after the figures is V, X, Y
or Z, then this figure is kW. |
| Letters after
the figures |
| V |
Vapour cooled |
| X |
Air cooled |
| Y |
Water cooled |
| Z |
Water cooled |
| Next letter |
| A,B,C,D,E |
Valves with
stems and wire feed-through connectors |
| F,G,I |
Valves with
pressed glass bases and prong feed-through connectors |
| H,J,K |
Valves with
thoriated tungsten cathodes |
| L,M,N,O,P |
Valves of
coaxial design |
| If there is
only one letter, then the valve is an all-glass radiation or air-cooled
type; if the penultimate letter is V, X, Y or Z the valve has an external
anode. The letter S at the end indicates a special design. |
|