|Project: Valve Amplifier|
|Skills||Electronics, High Voltage, Audio|
|Summary||A valve amplifier.|
When Duality showed me his collection of electronic valves i asked him if i could build an amplifier with them.
Based on the characteristics of the valves i could choose from i chose to use the RCA-75 ( a duplex-diode + high-mu triode ) for the input stage and a 6C5G for the end stage, i then started calculating the component values to get the right amplitude and bias, after i was done doing that and had double , no- triple checked my design i built on a piece of plastic, i drilled holes matching the valve footprint and used terminal strips to connect them, i mounted the parts floating on their connectors.
I used Duality's valve based bridge rectifier together with a variac for the 120VDC supply and my cellphone as an audio source, in this configuration my amplifier was able to power the large speakers in the hackerspace.