Mullard ET51 / CV5277 trochotron
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This valve measures 85x43mm overall and has a 26 pin B26A base |
| Heater voltage |
6.3V |
| Heater current |
300mA |
| Target supply voltage |
200V |
| Target resistor |
18k ohms |
| Output voltage across target resistor |
100V |
| Spade supply voltage |
100V |
| Spade resistor |
100k ohms |
| Grid bias voltage |
+30V |
| Grid circuit resistance |
<10k ohms |
| -ve grid input pulse amplitude |
75V |
| Voltage on all spades to clear tube |
0V |
| Spade 0 voltage to reset tube |
0V |
| Max input frequency |
1MHz |
| Pin |
Function |
Pin |
Function |
| 1 |
Spade 0 |
14 |
Spade 2 |
| 2 |
Target 9 |
15 |
Target 1 |
| 3 |
Target 8 |
16 |
Even switching grids |
| 4 |
Odd switching grids |
17 |
Target 0 |
| 5 |
Target 7 |
19 |
Spade 9 |
| 6 |
Spade 7 |
20 |
Spade 8 |
| 7 |
Target 6 |
21 |
Heater |
| 8 |
Target 5 |
22 |
Spade 6 |
| 9 |
Spade 5 |
23 |
Spade 4 |
| 10 |
Target 4 |
24 |
Spade 3 |
| 11 |
Do not connect |
25 |
Heater |
| 12 |
Target 3 |
26 |
Spade 1 |
| 13 |
Target 2 |
27 |
Cathode |
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Above: ET51; below: ET51 which also has CV5277 stamped on the body
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