Roaming Terminals 6 and 10 on Voltage check [resolved]

[mjekot]

As the title suggests, I have a roaming T-6 and T-10 on voltage check.

I bravely plugged in my amp tonight. The tubes powered up and glowed nicely. The little red LED's glowed too! So far, so good I thought.

All terminals seemed to check out OKAY with the exception of T-6 and T-10 - See below for my readings. T-21 might be a little high but within the 10-15% threshold

Terminal Voltage (VDC unless otherwise specified)

1, 75-90      78.4
2, 170        169.4
3, 0            0.1
4, 170        169.6
5, 75-90        78.1
6, 0              Roaming
7, 100          101.2
8, 0              .06
9, 100          104.0
10, 0            Roaming
11, 0            0.8
12, 0            0.1
13, 170        169.8
14, 0              0.2
15, 185        189.9
20, 0            0.5
21, 206        211.6
A1, 90            78.6
A2, 0              0.4
A4, 0              0.4
A5, 0              0.4
A6, 90            78.7
A7, 0              0.3
A9, 0              0.4
B1, 90            78.8
B2, 170          169.5
B3, 100          101.9
B4, 90            78.8
B5, 170          169.8
B6, 100          104.8
B7, 0                0.4
B8, 0                0.4

What should I be looking into??

Thank,

Mark

 

[Paul Birkeland]

What does it roam between?

There might be a few mV of voltage (1mV is 0.001V), which isn't abnormal, and isn't anything to be concerned about.

-PB

 

[mjekot]

Paul,

I rechecked this AM and got the same results.

The Roaming on T-6 was roughly between 31.0 and -7 mv
The Roaming on T-10 was roughly between 48.0 and -10 mv

The values changes very rapidly (say about 4x per second so it was difficult to be exact) and was not steady. Example - 18, 12, -8, 26. 16. 0, 14, -9

All other terminals hold steady where they should be.

I shot a video of the reading just so I had reference.

 

[Paul Birkeland]

You are still way under a volt, there's no issue here.

-PB

 

[mjekot]

Thanks for the reply and assurance Paul. It is good to have a second set of eyes. On to the next step!

Mark