GEC/Marconi/Osram
(e.g. KT66)
A letter or letters followed
by digits. The digits distinguish between different valves of the same
type.
| Letter(s)
|
A |
Industrial valve |
| B |
Double triode |
| D |
Diode |
| GU |
Gas filled rectifier |
| GT |
Gas triode |
| H |
Signal triode (high impedance) |
| KT |
Kinkless tetrode (beam
tetrode) |
| L |
Signal triode (low impedance) |
| MU |
Indirectly heated rectifier |
| N |
Output pentode |
| P |
Output triode |
| QP |
Quiescent push-pull double
pentode |
| S |
Tetrode |
| U |
rectifier |
| VS |
vari-mu tetrode |
| W |
vari-mu pentode |
| X |
triode hexode/heptode/octode
frequency changer |
| Y |
Tuning indicator |
| Z |
Sharp cut-off HF pentode |
| Figures |
distinguish
between different valves of the same type |
|
