INVICTA 126

< Back

The picture tends to have wavy verticals. This trouble occurred when the picture lacked width. Replacement of the metal rectifier remedied the
width, but still the wavy verticals were present. Could you please help me to locate this fault ? -G. Fryer (Newcastle).
We have found the wavy verticals are caused
by the improper contact between a chassis tag and
the chassis. This tag is riveted and carries the
heater return lead as well as the cathode corn – ponent chassis connections of the PCF80 (line
oscillator) valve. The tag should be well soldered
to chassis or a thick lead taken to another chassis
tag. The waviness is due to hum being induced
into the PCF80 circuit by the poor contact.

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.