The Guitologist | 6 years ago

In this vid, I'll show you how to make your own cheap, DIY tube or valve guitar amplifier biasing probes for measuring plate current and plate voltage. Similar ready-made probes from Eurotube sell for much more, and they don't come with the multimeter: https://amzn.to/2Fgsu4r
WHAT YOU WILL NEED: a cheap multimeter, an old worn out tube, and an octal socket. If you play your cards right, you can get the multimeter for FREE, the old tube of course for FREE, and the socket for FREE, but if you have to buy the socket, they are available for under $3. I also used a bit of black tape, some solid core wire, and shrink tubing.
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