2 tubes, matched as pair
The 6CA7 is a powerful power tube developed in the 1950s by General Electric (USA). It is electrically largely compatible with the European EL34, but more robust in construction and differs in sound behavior. Both tubes are electrically interchangeable. The 6CA7 offers an alternative sound color and more robust operation at high power due to its Beam Tetrode design. Those who prefer more headroom, warmth, and depth in sound often choose the 6CA7.
Technical Comparison: EL34 vs. 6CA7
| Feature | EL34 | JJ 6CA7 |
| Tube type | Pentode | Beam-Power-Tetrode (beam power) |
| Socket | Octal (8-pin) | Octal (8-pin, identical to EL34) |
| Heater voltage (Uf) | 6.3 V | 6.3 V |
| Heater current (If) | approx. 1.5 A | approx. 1.5 A |
| Max. anode voltage (Ua) | 800 V | 800 V |
| Max. anode power dissipation (Pa) | 25 W | 25 W (partly more robust) |
| Screen grid voltage (Ug2 max.) | 450 V | 500 V |
| Amplification factor (µ) | approx. 11 | similar, slightly higher |
| Construction | Slim glass envelope | Larger, wider envelope |
| Pin configuration | identical | identical |
| Sound character | „British“ – centered, assertive | „American“ – warm, powerful, round |
