Manuel Caldeira

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Lars Malmgren

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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

EO&N DIY Tube Tester Schematic

Schematic_Tube tester V2_2022-11-03.pdf

EO&N Battery Switcher Schematic

Schematic_Battery Switcher V1_2022-10-12.pdf

Download Gerbers

Oct 30,2022

5,691 views

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.

5691

10.00 (1)

Published: Oct 30,2022

Standard PCB

Download Gerber file 205

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