Extracto de la colección de válvulas de Roy Johnson. Estas imágenes fueron aportadas en la página de válvula respectiva por Roy Johnson.
| T250_MO |
1922 |
| MO Valve Co. Ltd.; GB |
GB |
|
| B8 |
1924 |
| BTH (B.T.H.), British Thomso... |
GB |
|
| DE5_Marconi |
1924 |
| MO Valve Co. Ltd.; GB |
GB |
|
| R5V |
1925 |
| MO Valve Co. Ltd.; GB |
GB |
|
| PM2 |
1926 |
| Mullard Radio Valve Co. Ltd.; |
GB |
|
| 210HL_Cossor |
1926 |
| Cossor, A.C.; London |
GB |
|
| 80 |
1927 |
| Common type USA tube/semicond. |
USA |
|
| UY227 |
1927 |
| Common type USA tube/semicond. |
USA |
|
| HL210 |
1928 |
| Common type Great Britain tu... |
GB |
|
| PX4 |
1929 |
| Marconi-Osram - (Valves/Tube... |
GB |
|
| HT4 |
1929 |
| Westinghouse El. & Mfg. Co. ... |
USA |
|
| AC/HL |
1929 |
| Common type Great Britain tu... |
GB |
|
| DH |
1931 |
| Marconi-Osram - (Valves/Tube... |
GB |
|
| DPT |
1931 |
| MO Valve Co. Ltd.; GB |
GB |
|
| RGN2504 |
1931 |
| Telefunken Deutschland (TFK)... |
D |
|
| DP/Pen |
1933 |
| Cossor, A.C.; London |
GB |
|
| VDSB |
1933 |
| Marconi-Osram - (Valves/Tube... |
GB |
|
| AB2 |
1934 |
| Common type Europe tube/semi... |
EU |
|
| 955 |
1934 |
| Common type USA tube/semicond. |
USA |
|
| AZ1 |
1935 |
| Common type Europe tube/semi... |
EU |
|
| D41 |
1935 |
| MO Valve Co. Ltd.; GB |
GB |
|
| D42 |
1936 |
| MO Valve Co. Ltd.; GB |
GB |
|
| 5U4G |
1936 |
| Common type Worldwide tube/s... |
ZZ |
|
| D63 |
1937 |
| MO Valve Co. Ltd.; GB |
GB |
|
| ECH2 |
1938 |
| Philips; Eindhoven (tubes in... |
NL |
|
| EL33 |
1938 |
| Common type Europe tube/semi... |
EU |
|
| EC50 |
1939 |
| Common type Europe tube/semi... |
EU |
|
| EL50 |
1940 |
| Common type Europe tube/semi... |
EU |
|
| DDD25 |
1941 |
| Common type Europe tube/semi... |
EU |
|
| DF25 |
1941 |
| Philips; Eindhoven (tubes in... |
NL |
|
Roy Johnson inauguró esta muestra de su colección el día 13.Oct.2006.
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