18-01-2022, 12:10 PM
(This post was last modified: 18-01-2022, 12:12 PM by peter scott.)
(17-01-2022, 07:16 PM)Panrock Wrote: How to watch the Queen? It's time to crank out again the picture of my 'Bude' (Baird outside - Bush inside) showing HRH in rather squashed form.
I sometimes wonder why I ever made the Bude. It is truly awful to work on access-wise.
Steve
Your Bude is not the only set of this age that is a pig to work on. You may have noticed the dreadful photo I posted earlier of my TV22 showing a decided lack of interlacing. It turns out I had missed a waxy but that was an easy fix so I then decided, since the iron was hot, to see if I could fix the frame linearity of my TV32. Unlike its older sibling the '32 is not easy to remove from its cabinet so I need to operate it on its side with the RF deck hanging out the back and anything on the chassis top side is only visible with a small mirror. I think I had previously replaced every timebase capacitor in the thing and in desperation actually replaced the two 200pF micas this time. Needless to say that changed nothing. The poor little ECL80 frame oscillator and output is supposed to run enough current to show 10 volts on the cathode but mine was showing 4 volts despite having a very healthy boost voltage.
After trying out about 20 ECL80 pulls I finally got one or two that gave me 6 or 7 volts but still showing fold over at the bottom of the picture. I then threw away a handful still believing that the others might have some use in a less stressful circuit. Am now awaiting a supposedly NOS part.
Peter
