|
Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
|
Thread Tools |
18th Mar 2018, 9:02 am | #21 | |
Dekatron
Join Date: Mar 2008
Location: Worthing, West Sussex, UK
Posts: 5,185
|
Re: Waking up a Bush TV96.
Quote:
I would normally remove the LOPT and give it a couple of hours in the oven, but decided to try passing around 1 watt through the overwind for a couple of days, as others had reported success with this method. It certainly did the trick with the Pye, I had previously run the set several times in the hope it would slowly improve with use, which proved to be unsuccessful. Mark |
|
18th Mar 2018, 3:58 pm | #22 |
Hexode
Join Date: Dec 2014
Location: West Midlands, UK.
Posts: 315
|
Re: Waking up a Bush TV96.
Thanks Mark, for the details.
I'm doing this to a LOPT at the moment and in situ. I'm using 1 watt but am doing both coils. Just to add to the details if you know the resistance of the coil, mine is 370 ohms, then: V = sqrt(R*W) so in my case V = sqrt(370*1) which is 19.2. [ sqrt is the square toot eg sqrt(9) is 3 ] I |
19th Mar 2018, 9:52 pm | #23 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
|
Re: Waking up a Bush TV96.
It should not be necessary to warm up the underwind other than to dry out residual dampness.
There are far less turns on it and breakdown is rare. The problem with removing the LOPT is DISTURBANCE! Unsoldering the tags can lead to heat travelling into the windings and breaking down tired insulation. Warm her up in situ. Top cap of PL81 to EY86 anode. John. |
19th Mar 2018, 10:12 pm | #24 |
Dekatron
Join Date: Jan 2006
Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex.
Posts: 5,817
|
Re: Waking up a Bush TV96.
Going back to your handy explanation of the failed fuse [p4* and 6*] John, I opened up my large trusty Far East Multi-Band large radio recently [it had been in damp conditions for a while]. The 60ma fuse seems to have disintegrated but there's no sign of any fault condition and its working fine now the power can get though. I'm no longer puzzled as well.
Dave W |
22nd Mar 2018, 1:47 am | #25 |
Heptode
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 551
|
Re: Waking up a Bush TV96.
After 5 days drying out the LOPT I had the set on this evening for 3 hours, overwind only barely warm and width stable.
Sounds like a success. John Joe |
22nd Mar 2018, 10:04 am | #26 |
Dekatron
Join Date: Mar 2008
Location: Worthing, West Sussex, UK
Posts: 5,185
|
Re: Waking up a Bush TV96.
Glad to see drying the LOPT out was a success, please post some photos of the set working.
Mark |
22nd Mar 2018, 3:17 pm | #27 |
Retired Dormant Member
Join Date: Jan 2018
Location: Chamalières, France.
Posts: 167
|
Re: Waking up a Bush TV96.
Hello,
After reading all this, I think I have been very lucky when I found my LV30 without this LOPT problem. The set has been stocked in damp atmosphere I think, regarding the rust everywhere. I remember also a Ducastel 441 lines TV found in a discharge and brought to the club. I simply re-impregnated the LOPT with special varnish. Sunny day in France. Roger |
22nd Mar 2018, 4:36 pm | #28 |
Heptode
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 551
|
Re: Waking up a Bush TV96.
This must surely be the best way to dry out a lopt. The tube has responded well to a bit of use
John Joe. |
22nd Mar 2018, 7:11 pm | #29 |
Dekatron
Join Date: Mar 2008
Location: Worthing, West Sussex, UK
Posts: 5,185
|
Re: Waking up a Bush TV96.
Looks good, the CRT will improve with use. In my experience it takes 8-10 hours to fully wake them up.
I have a working but as yet unrestored Bush TV85, the CRT is really good, Mullard tubes usually are.... Mark |