Murphy V114 9" table model 1947 - Page 4 - UK Vintage Radio Repair and Restoration Discussion Forum

Heatercathodeshort · 21st Aug 2015, 7:55 am

Hello Robin, The rubber leads to the CRT base were the only ones actually needing replacement. I think this was because the base had to be removed each time the RF chassis was lowered. That is why I made up and extension plug and socket as can be seen in a couple of the pictures. The remainder of the massive cableforms are still in a servicable condition. J.

mark pirate · 21st Aug 2015, 8:50 pm

Quote:

The rubber leads to the CRT base were the only ones actually needing replacement.

I have a lot of crumbling rubber wiring to deal with in my V124C

I suppose it is down to storage conditions over the years, I have a couple of Bush sets with the same problem

Mark

brianc · 22nd Aug 2015, 3:16 pm

I have been told that the formulation of the rubber can differ and very often, it is down to the plasticiser used which makes some rubber insulation rot and others not. I have also noticed that different colours can be affected differently.
PS. Please don't ask me what a plasticiser is

.

mark pirate · 22nd Aug 2015, 3:43 pm

Quote:

I have also noticed that different colours can be affected differently.

I have noticed this too, particularly with the Murphy. Black has suffered the most, it has also gone rock hard, while the yellow leads are still pliable.

The mask on my Murphy is still in shape, albeit a bit cracked. I have seen others totally disintegrate in to a saggy black goo!

Mark

Heatercathodeshort · 22nd Aug 2015, 3:45 pm

Quote:

Originally Posted by brianc

PS. Please don't ask me what a plasticiser is

.

Just as well Brian. The answer might get us both banned..

J.

brianc · 22nd Aug 2015, 4:30 pm

That's a good one John

AC/HL · 22nd Aug 2015, 6:04 pm

Post 63 contains everything we need to know on the subject. Further study is entirely optional, but is unlikely to help with the restoration.

21st Aug 2015, 7:55 am	#61
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Murphy V114 9" table model 1947 Hello Robin, The rubber leads to the CRT base were the only ones actually needing replacement. I think this was because the base had to be removed each time the RF chassis was lowered. That is why I made up and extension plug and socket as can be seen in a couple of the pictures. The remainder of the massive cableforms are still in a servicable condition. J.

22nd Aug 2015, 3:16 pm	#63
brianc Rest in Peace Join Date: Jun 2004 Location: Burghfield, Reading, Berkshire, UK, Posts: 1,055	Re: Murphy V114 9" table model 1947 I have been told that the formulation of the rubber can differ and very often, it is down to the plasticiser used which makes some rubber insulation rot and others not. I have also noticed that different colours can be affected differently. PS. Please don't ask me what a plasticiser is .

22nd Aug 2015, 4:30 pm	#66
brianc Rest in Peace Join Date: Jun 2004 Location: Burghfield, Reading, Berkshire, UK, Posts: 1,055	Re: Murphy V114 9" table model 1947 That's a good one John

22nd Aug 2015, 6:04 pm	#67
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Murphy V114 9" table model 1947 Post 63 contains everything we need to know on the subject. Further study is entirely optional, but is unlikely to help with the restoration.