Hi matt. I restored mine a few years ago
https://www.vintage-radio.net/forum/...ad.php?t=79809
I would give your set a blast with a signal generator, I had a similar problem with an HMV set a while back, it turned out to be a problem with an o/c coil.
I hope you have a good CRT, my T164 is flatter than a pancake
Certainly difficult to find a good CRM92!
Mark