measuring plate voltage

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I have two questions......
1. Am I measuring the plate voltage correctly if I measure it at the plate side of the plate loading resistor shown in the linked schematic?
Should the plate voltage be changing by as much as 10 -15 vdc depending on what brand of tube I use. That is what is happening on my bread boarded phono preamp.

http://phonoclone.com/diy-pho3.html (Open in New Window)

Edits: 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/25/14 07/26/14

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Topic - measuring plate voltage - vinnie2 10:05:16 07/25/14 (9)

This is really crazy.... - vinnie2 15:04:46 07/26/14 (0)

RE: measuring plate voltage - tubular.well 23:09:06 07/25/14 (0)

RE: measuring plate voltage - danlaudionut 15:00:27 07/25/14 (2)

RE: measuring plate voltage - vinnie2 04:34:40 07/26/14 (1)

RE: measuring plate voltage - danlaudionut 06:30:01 07/26/14 (0)

RE: measuring plate voltage - BofService 12:20:33 07/25/14 (3)

RE: measuring plate voltage - vinnie2 12:53:47 07/25/14 (2)

Does it work for you? - thermionic addictions 14:57:30 07/25/14 (1)

RE: Does it work for you? - vinnie2 04:36:18 07/26/14 (0)

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