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Post by brucen on Apr 17, 2024 16:48:25 GMT 12
I've recently built a valve tester, largely following this design: valveheaven.com/2015/03/an-inexpensive-easy-to-build-diy-valvetube-tester/mI've largely followed the design principle, but used readily available digital meters (DCV and DC mA) from Ali Express. I also ended up with 2 transformers - one for the HT circuit and the other for heaters and the meter supplies. If I was to do it again, I'd use a larger case - its a bit congested inside and on the front panel. I'd also think about including the ability to test rectifiers - but that would mean quite a different power supply design. The picture is of a good valve, about -2V of grid bias and nearly 12mA of plate current. Attachments:
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Post by Radiotech on Apr 21, 2024 17:59:34 GMT 12
Looks good! I have seen a number of people build their own tube testers. Manuel Caldera (Youtube - Electronics Old and New) did one not so long ago. Take a look at it here: www.youtube.com/watch?v=3fCE4uaw_cUBTW, your link to the valveheaven article is 404.
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Steve
Society Members
vintageradio.co.nz
Posts: 734
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Post by Steve on Apr 21, 2024 23:12:10 GMT 12
Nice build!... I've occasionally thought about building something modern, but I have a working PACO one that just works, so replacing it isn't a high priority for me... but I still like the idea of the project...
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Post by brucen on Apr 22, 2024 9:27:35 GMT 12
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Post by brucen on Apr 22, 2024 9:31:29 GMT 12
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Post by radioholic on Apr 25, 2024 18:11:48 GMT 12
You can use your tester for rectifiers. You just need to put a resistor (say 5.6K) in series with the rectifier anode, and measure the voltage across the rectifier with a DMM. Then compare the results with the datasheet.
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