[Heatercathodeshort]

Hello David,
Now why did you have to obtain that Viewmaster and keep me up late tonight? It is not too bad and should be an easy fix.

I have the full viewmaster service data, modifications and plans. If you want them, please let me know.

I have had this channel 3 chassis version hanging around the workshop for years! I didn't bother with it as I didn't want to play around with the channel selector on the Aurora and maybe break the switch..I decided to pull it out early this evening and give it a go.

I also robbed the Mazda tube for another project so thought it might be fun to fit a Dumont 5FP7 tube. of WW2 vintage that I have had for very many years.
This tube has a 5" screen, magnetic focus and deflection, 6.3v heater, a standard neck diameter and an octal base. It also has a double layer, very long persistance screen....At least five minutes as can be seen from the picture. On a test card it looks fine but on moving images, well you can imagine. Picture looks like a watercolour that has been left out in the rain.

Chassis faults were just caps in the thyratron timebase generators and output stages. Just a bit of fun but the original constructor made a first class job of it. I also had to fit an 'ELAC' focus assembly in place of the original as it was not suitable for a tetrode tube and gave poor focus.
Hope you sort it out. John.
PS The second picture shows the afterglow, three minutes after turning off!