Hi.
More work done today and some changes to the circuitry.
The 45Mhz crystal is low and doesn't always start and the 41.5Mhz crystal is as dead as a dodo. So I have found a 44.3Mhz crystal for Vision and a 40.815Mhz crystal for sound, both a bit low for channel 1 and of course not exactly a 3.5Mhz spacing but it works extremely well.
It has been pointed out to me on post 1 I have quoted the wrong valves they are 1ZH37B NOT 1ZH42B (there is no such valve as a 42B anyway its a 1ZH42A) Just to clear up any confusion.
I have contacted Vincent Jakomin re 45 & 41.5Mhz crystals.
I have also tidied up the bias arrangements.
I'll upload a revised diagram in due course.
Two further Videos here:
https://youtu.be/CiT2tFXA-4M
https://youtu.be/7rQrSisX10E