Welcome to the thermionic website

Devoted to electronic valves [also known as tubes], valve radio circuits and equipment

This site is being built gradually, please check back again soon.

about & disclaimer
Some testing with this circuit was conducted with over 1.5 kV. Please don't try this unless you have experience at lower voltages and take great care.

This picture shows an 813 based Hartley oscillator transmitter being tested with a makeshift power supply.

This transmitter was intended for the 160m (1.81-2.0 MHz) Amateur Radio band.

I dismantled it after a slightly disappointing period of testing and made another version using an 812A triode. This one works a whole lot better.

You can read more about this project and some others on my projects page.

valve FAQs
"Sweep Tubes"
Sansui HiFi receiver
my projects
1920's radio
transceiver project
"TR40" (stalled :)
Voltage Regulators
site history
external links

copyright (c) AJB 2001-3
email: andrew@thermionic.org
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last updated:   
22nd July 2003