STC Brimar codes
If the valve was for export
then the RETMA code was used, sometimes with an SV prefix. Otherwise:
| 1st figure(s) |
1 |
Halfwave rectifier |
| 8 |
RF pentode |
| 9 |
Vari-mu pentode |
| 20 |
Triode hexode |
| Letter |
A |
4-volt heater |
| B |
2-volt heater |
| D |
Indirectly heated other
than 2 and 4V |
| Figures |
Serial number |
Special purpose valves:
| 1st figure(s) |
2 |
Diode |
| |
3 |
Triode |
| |
4 |
Tetrode |
| |
5 |
Pentode |
| |
22 |
Double diode |
| |
etc. |
| Letter |
Max anode
dissipation and type |
| Figures |
Serial number |
| Letters |
Base type
and special features |
|
