Ferranti T1002: Lack of Width

You are here:
< Back

Despite the substitution of a new line output transformer, boost diode, line oscillator and rectifying valves, it was not possible to get sufficient width. After a period of twenty minutes or so the picture shrank still further, and distortion crept into the sound reproduction. This drew attention to the sound channel and it was noticed that the 30P12 sound output valve ( V15 in Trader sheet 1326) was looking hard-worked. This valve was replaced and the width spread out immediately, and with it the sound distortion disappeared.

Apparently the fault in V15 was loading the H.T. circuit heavily, but the H.T. voltage was not low enough to be suspected in the first place.

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.