U Tracer Tube Tester
This little but very nice tube tester can be ordered as a kit from Ronald. http://www.dos4ever.com/uTracer3/uTracer3.html
The box and sockets etc must be prepared by yourself.
This is how mine looks like during a test of a FU-29 tetrode.
And this is the software that comes with the kit.
This is one of my tube amps.
Watch my other projects: https://sm6why.n.nu/
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