[DonaldStott]

Firstly an apology - what I meant by "can't get a reading" was that I couldn't get the meter probes properly onto the Secondary tags as they are located behind the metal strut/support for the scale lamp. Removed this strut to gain access and gave the solder on the tags a qucik dab with liquid flux to remove the oxidation. Result, I'm getting a reading of 0.8 ohms on the Output Transformer Secondary - seems good to me?

Secondly is where the mystery (for me) really starts. Reconnected back up to my lamp limiter and got the same result with the bulb glowing quite brightly and the scale !amp barely lit - a dull orange glow. Removed one of the valves (CY 31) at this point and the bulb in the lamp limiter got brighter as did the scale lamp!

I have no idea what is going on...?