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Old 25th Oct 2018, 2:38 pm   #127
1100 man
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Join Date: Apr 2016
Location: Ventnor, Isle of Wight, & Great Dunmow, Essex, UK.
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Default Re: Help needed restoring a Murphy V310

Hi Dave,
That looks to me like an extremely low emission tube! Low contrast, very poor focus and probably the brightness control has to be at max to see anything at all?
You asked in a much earlier post what a low tube looked like, well the answer is- that!

It's not the end of the world though. Almost every set I've got came with a tube that didn't have any useful emission- no reading at all on my tester. Sometimes they recover with use but I've usually found rejuvination necessary. In almost every case this has worked amazingly well. It depends how many times this has been done in the set's life as to how well it will work.

It looks like you have a reasonable signal getting as far as the tube although without scoping it it's difficult to be sure.
The white lines are flyback lines- don't worry about those at this stage. The poor tube will tend to make these more obvious.
Check the earth connection to the black 'dag' coating on the tube. In my V410, this was sparking.

Don't give up on it yet!

All the best
Nick
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