| S/No | TRANSISTOR | THEMIONIC VALVE |
| 1 | Heat sensitive | Required heat |
| 2 | Small size | Large and bulkier |
| 3 | Require very little power for operation | Require much more operating power |
| 4 | Long life | Short life |
| 5 | Low cost | Very cost |
| 6 | Non sensitive to shock | Higher sensitive to shock |
| 7 | Little weight | Heavier |
| 8 | Ruggedness | Fragile |
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