Another odd Voltage reading...

[JubileeMan 2555]

measured each side of the Phase inverter tube on an amp and one side was the spec 230v, and the other was 217v? I don't understand how only one can be off. Any suggestions?

http://www.shelleygrund.com/images/voltreadings.jpg

[Old Tele man]

...could be: (a) plate resistor has 'drifted' out of spec, or (b) that half of dual-triode is conducting harder, or (c) a combination of both.

...do you have another tube to try (temporarily)?

[John Phillips]

Since the two sides have different plate resistor values (82K vs 100K) the voltages should be different - the one with the 100K resistor should be slightly lower, as you have found. The diagram is wrong, which is not unknown, there are other examples too.

[BLC]

Check the actual ohms of the 100k & 82 K resistors. I will bet they are off