• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tube identification

Does anyone know this tube? No text or etchings. A few mm shorter than an 807. Heater current 0,88 A.
WhatsApp Image 2023-05-25 at 11.33.46 (1).jpeg
What higher filament current?
Your tube: 0.88A, . . . At 6.3V???
807: 0.9A at 6.3V
That is a close as you get with production tube variances.

The same filament current may, or may not, mean it is an 807 (a 6L6 has 0.9A filament current, but a 6L6 is not an 807).
If you think a 6L6 is a good replacement for an 807, just make a 75 Watt CW transmitter, then you try and tune up the Pi filter to a very reflective antenna (reflective, as in it is either 10 Ohms or 300 Ohms reflected impedance to the transmitter). Zap!

The photo looks like 5 pins at the base.
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