Another promising tube

The 6C4 electron tube.
http://www.nj7p.org/Tubes/PDFs/Frank/093-GE/6C4.pdf


Remember a kid at school had made an self oscillating FM transmitter using just one 6C4. He was proud of covering the sea city of Glyfada near Athens. He used to say the tube radiates.


How would a Pleiades amplifier sound with relatively few anode anode clots and the trick of biasing from anode to grid with a high Megohm resistor?


Driving headphones one has to be very careful to take all precautions for ear protection.


How would the 6C4 sound direct driving a Philips AD5046N 800Ω speaker?


Would the electron tube oscillate with just 6-12V on FM biasing less negative from anode to grid?


So far the best results on Pleiades experiments are with the EF183 triode connected and operated with 3.9V on the Pleiades V6 microphone front end amplifier, or the V5 with 2 stages and slightly higher voltage. The 2N3053 driving directly the Philips AD5046N speaker. And the 12K5 driving the Sennheiser HD580 headphones on the Pleiades Electra II circuit.


References:


On preserving transconductance of electron tubes at as low anode potential as 3 volts - euroelectron


Operating features of the Audio - E.H. Armstrong


Pleiades V6 schematic


Pleiades Electra II schematic


http://euroelectron.blogspot.gr/2018/03/madonnas-voice-coming-from-point-source.html