Amplifone Tube Issues

I have been going through some Amplifone tubes recently and came across one I wanted to share.

http://home.roadrunner.com/~salahiandson/ampb1.jpg

http://home.roadrunner.com/~salahiandson/ampb2.jpg

The deflection and HV are 100% on this machine. The yoke and focus rings are properly installed and the monitor is degaussed and converged good enough for testing.

I attribute the above anomalies to color phosphor burn. I suspect a specific color of the phosphor has been burned away in these areas making them void of this color. I have very limited knowledge in this area so that is just a guess. The other suggestion has been some type of shadow mask movement but that does not appear to be the case to me for a few reasons.

I have never seen this before with an Amplifone so I wanted some other input on this diagnosis.

Thank you.

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Received on Sat Aug 13 10:41:14 2011