< Back

Occasionally the brilliance of the screen decreases to such an extent that the picture disappears. At these times the voltage on the grid of the tube increases. Sometimes when this fault
occurs the EY51, which is new, glows blue. I have checked the brilliance control and all the
capacitors and resistors in its associated circuit. I have also tested all the valves.-G. F. Winter
(Belfast, 14).
If the tube grid voltage varies, even though the voltage applied to the grid from the brightness control is constant, then there is little doubt that the tube is at fault. However, check the capacitor connected to the grid for insulation resistance.

Table of Contents

Leave a comment

I have read the privacy policy and accept
Read our privacy policy

This form collects your name, email and content so that we can keep track of the comments placed on the website. For more info check our privacy policy where you will get more info on where, how and why we store your data.

This site uses Akismet to reduce spam. Learn how your comment data is processed.