• 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.

Kind of cool check it out


2005-03-10 11:57 pm
I did an experiment while at school in the late '60s.
I got the idea from an American Hobbyist magazine.

It was essentially the same but using a lab. bunsen burner - a more controllable flame.

The metal burner was the 'cathode' - electrons supplied via a wick from a bottle of copper sulphate - nice bule flame

The modulation was supplied via a mains transformer in reverse between 'cathode' and 'grid'.

HT from a lab power supply.

At a school science fair, we placed it in the centre of the lab with a walkway round the outside (to prevent contact with the HT) and hid all the wires so we had a flame playing music !!