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 Tripler repair????
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 Return to top of page · Post #: 1 · Written at 10:43:49 AM on 19 January 2014.
Redxm's avatar
 Location: Tamworth, NSW
 Member since 6 April 2012
 Member #: 1126
 Postcount: 448

Ok, so not entirely valve related but....

Palsonic 71cm CRT TV about 12 years old.
I have arcing on the tripler from the HV lead. Is this repairable by cleaning and some sort of silicon??

Thanks
Ben


 
 Return to top of page · Post #: 2 · Written at 11:24:24 AM on 19 January 2014.
Redxm's avatar
 Location: Tamworth, NSW
 Member since 6 April 2012
 Member #: 1126
 Postcount: 448

Update - cleaned, taped up temporarily and it works. I'm guessing neutral cure silicon will work for a while until I find a new one. Cant see anything listed from WES..

ben


 
 Return to top of page · Post #: 3 · Written at 7:56:59 PM on 20 January 2014.
TV Collector's Gravatar
 Location: Ballarat, VIC
 Member since 4 January 2011
 Member #: 803
 Postcount: 456

You can buy special high voltage silicone for these sorts of repairs.

WES stocks this, it's called Dow Corning RTV Sealant part number SIL738.

Finding a replacement part may be difficult as CRT TV replacement parts are no longer being manufactured.


 
 Return to top of page · Post #: 4 · Written at 8:07:47 PM on 20 January 2014.
Redxm's avatar
 Location: Tamworth, NSW
 Member since 6 April 2012
 Member #: 1126
 Postcount: 448

I ended up dosing it with neutral cure silicon that I had on hand. I did see the WES stuff, but screaming kids etc...

Has been running for a couple of hours successfully so far.
I might call in a favour and see if one of the TV techs in town has a junk pile....

Ben


 
 Return to top of page · Post #: 5 · Written at 4:46:08 PM on 26 April 2016.
Wirelessvalve's Gravatar
 Location: Tennant Creek, NT
 Member since 23 April 2016
 Member #: 1913
 Postcount: 17

Hewre is what I used to do:-

Discharge aquadag first or you will get "bitten"
Then clean the affected area with isopropyl alcohol and use electrical grade RTV coloured white.
Dow-Corning # 738, neutral cure.
You can get from electrical wholesalers or WES.

When applying, do not "tool" it to much or you will end up with a pin-hole that will corona and break down again.
Check after 24 hours by running the set in the dark with CRT brightness turned right down to reduce the load on the EHT supply and look for any blue glow which is corona and fizzing and the smell of ozone...
I have done heaps and all been successful... also repaired LOPT's both Valve and S/state, particularly to ones that had a yellow glue around the circumference of the HV winding with a glued in corona ring, the yellow glue went all hard and brittle...

If you get arching at the Ultor cap (final anode) of CRT, again clean the area around the contact cavity and the suction cap connector, then use silicone grease, A Rocol product I purchase from CBC Bearings.
Rocol part No RY421515.

In the TV repair days we used Gensil 13 which we bought from Bevaloid Industries in NSW.

Remember remember to discharge the ultor of the CRT, I used my Swe-Check HV meter or you can make a "thunder stick" with 10 x 10Megohm focus resistors in series in a piece of plastic tube and a suitable earth lead and a piece of S/steel antenna wire for the hot end probe...
Wes have the Phillips focus resistors or you can scrounge from a 1970s Philips, PYE, Kriesler 70s C-TV.. Rank Arena sets had a 100Mohm resister in a large ceramic tube....
Never directly short a Ultor cap to frame/common of a solid state TV or you may end up with 3 legged fuses or 3 legged short circuits.....
Hope this helps...


 
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