B424K TRIODO DETECT. Y AMPLIFIC. DE BF |
 Europeo | Vf=4V | If=0,1A | Vp=200V | Ip=6mA | Vg=-3V | ri=9K | µ=24 | | | |
| B424/S TRIODO DETECT. Y AMPLIFIC. DE BF |
 Europeo | Vf=4V | If=0,1A | Vp=200V | Ip=6mA | Vg=-3V | ri=9K | µ=24 | | | |
| B425 TRIODO DETECT. Y AMPLIFIC. DE RF Y BF |
 Europeo | Vf=4V | If=0,1A | Vp=200V | Ip=3,8mA | Vg=-3V | ri=21K | µ=25 | | | |
| B430N DIODO-TETRODO DETECT.-AMPLIFIC. DE RF |
 Europeo | Vf=4V | If=1,1A | Vp=200V | Ip=4mA | Vs=90V | Is=0,5mA | Vg=-3V | ri=200K | µ=600 | |
| B435N DIODO-TRIODO DETECT.-AMPLIFIC. DE BF |
 Europeo | Vf=4V | If=1A | Vp=200V | Ip=6mA | Vg=-3,5V | ri=15K | µ=30 | | | |
| B438 TRIODO DETECT. Y AMPLIFIC. DE RF Y BF |
 Europeo | Vf=4V | If=0,1A | Vp=200V | Ip=1mA | Vg=-3V | ri=19K | µ=38 | | | |
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