Kenneth Hutchinson used an old Heathkit tube tester to make a beautiful uTracer!
Visit my Testimonial Page to view this and many other beautiful uTracer implementations.

Stephen Lafferty wrote a beautiful review article for his website and included the design of a high precision heater supply!!

Zbigniew Stelmasiak from Warsaw compressed the construction of a uTracer into 4 min! Have a look!

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Cartoon specially made for me by Ale Moglia!
More beautiful cartoons on his site Bartola Valves