Hi Ron,
I am in the process of restoring an R109 too,
all the original valves were quite low emission but I managed to get NOS
replacements off eBay.
I replaced all the paper and electrolytic caps and all resistors that had
gone high.
The original vibrator unit and transformer were missing.
I have managed to obtain a vibrator and I will be fitting a suitable
transformer that was designed to fit in the Class D Wavemeter.
I really hate it when people modify equipment - I wish they would leave well
alone!!