Manuel Caldeira
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Description
Full supply board for DIY Tube Tester
A DIY Tube Tester needs a lot of different power supplies to allow you to really test tubes correctly. You can set up these supplies independently, but a better solution is to build a single board that gives you all the voltages you need. This is it.
Using one single external transformer from an old tube radio, we supply the board with about 240 VAC (the transformer secondary voltage), and the heater AC voltage. What we get is:
- Two regulated High Voltage supplies, independently adjustable from 0 to 250VDC;
- A Negative Bias supply, adjustable from 0 to approximately -20VDC;
- A regulated 6.3VDC Heater supply;
- A Control voltage signal to activate relays or opto-couplers for the other elements in the circuit, like meters, etc.
Schematic and Layout
Oct 30,2022
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Full supply board for DIY Tube Tester
Single board with 2 HV supplies (independently adjustable 0 to 250VDC), adjustable neg. bias supply, and regulated 6.3VDC heater supply.
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Published: Oct 30,2022
Download Gerber file 173
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