I had a chance to get the RGD on the bench finally. I replaced three capacitors that I found to be very leaky on a quick test around the chassis pre switch on. A Hunts electrolytic had corroded through one of it's leadout wires and was loose so I resuffed that with a new cap, I snipped the mains filter cap and put my AVO across the main smoother. Then with a hand on the switch I gave it some mains for a few seconds. The HT came up to around 100v before I switched off. I then cycled it on and off a few times allowing the HT to build up.
I noticed the HT decayed very fast when switching off so I suspected either had a short or the smoother was shot.
I left it on a little longer to allow the valves to warm up and just as a strained line whistle could be heard a resistor started to smoke badly.
After a check around I found the short was on the frame transformer, the fibre tag panel on to of the bobbin has curled up and enabled one of the tags to touch the frame of the transformer.
Clearing that short stopped the smoke and I found I could just see the raster collapse when I switched off. I then had a lingering spot which proved I had at least some EHT.
I had switched to 405 for switch on as I thought it might be Kinder to the lopt. I found though that only the 625 line hold pot adjusted the line speed.
On investigation I found the rocker is not moving the system switch I can't see why But I guess the linkage has broken or come apart.
Switching to 405 manually produced a lop sided blank raster the 405 line hold pot now working and far less scratchy than the 625 one!
Time to give it some signals! I connected the converter and selected channel 1.
I has clear sound and a very unstable picture but the tube looks very good!
Giving it some UHF and switching back to 625 produced a blank raster and distorted sound.
I then switched off and checked the lopt the secondary was barely warm but the primary was quite hot.
I decided that was enough for today I will let the lopt recover (hopefully) and then replace the rest of the capacitors in the line output stage before I run it again.
Then I will have a look to see what the picture fault is on 405. AGC fault?
Once it's working on 405 I will see what 625 does and then try and find out what is wrong with the system switch.
I am very please with progress so far though and the tube looks Ok which is a relief !