RAF (e.g.
VT98, VCR97)
Letters followed by digits
| VCR |
Valve Cathode Ray (CRT) |
| VGT |
Valve Gas Triode (thyratron) |
| VI |
Valve Indicator (magic
eye) |
| VR |
Valve Receiving |
| VS |
Valve Stabilising |
| VT |
Valve Transmitting |
| VU |
Rectifier |
| VW |
Selected types |
British
Army (e.g. ARP35, ATP4)
Letters followed by digits
| ACR |
Army CRT |
| AR |
Army Receiving valve |
| ARD |
Army Receiving Diode |
| ARDD |
Army Receiving Double
Diode |
| ARH |
Army Receiving Hexode |
| ARP |
Army Receiving Pentode |
| ARS |
Army Receiving Screen-grid
(tetrode) |
| ARTH |
Army Receiving Triode/Hexode |
| ARTP |
Army Receiving Triode/Pentode |
| AT |
Army Transmitting valve |
| ATP |
Army Transmitting Pentode |
| ATS |
Army Transmitting Screen-grid
(tetrode) |
| AU |
Army rectifier |
| AW |
Army stabiliser |
Royal
Navy (e.g. NGT1, NR49)
Letters folowed by digits
| NC |
Navy CRT |
| NGT |
Navy Gas Triode (thyratron) |
| NR |
Navy Receiving valve |
| NS |
Navy Stabiliser |
| NT |
Navy Transmitting valve |
| NU |
Navy rectifier |
|