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Old 24th Jan 2013, 8:57 pm   #21
G3JZF_John
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Default Re: My Bush tv43 restoration

I look forward to news on this.

Re modulators:
http://www.thevalvepage.com/projects...at/modulat.htm
gives a design that works. I did toy with the idea of making a printed circuit if there is not one out there already. The MC1496 IC is still available.
...But, as others have said, the Aurora is the real way to go!

John
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Old 25th Jan 2013, 4:33 am   #22
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Default Re: My Bush tv43 restoration

This is my old bush tv at the railway station.
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Old 25th Jan 2013, 5:13 am   #23
audion_1908
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Default Re: My Bush tv43 restoration

Quote:
Originally Posted by G3JZF_John View Post
I look forward to news on this.

Re modulators:
http://www.thevalvepage.com/projects...at/modulat.htm
gives a design that works. I did toy with the idea of making a printed circuit if there is not one out there already. The MC1496 IC is still available.
...But, as others have said, the Aurora is the real way to go!

John
I dont understand how that modulator workes but I know enough to build it, would old tv IF transformers work? as the design askes for "dust core transformers" as I know where a transistor based tv has been dumped and I can easly cut the boards out?
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Old 25th Jan 2013, 6:39 am   #24
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Default Re: My Bush tv43 restoration

I found that the wire going to the contrast pot was rubber insulated and badly perished, I was reading about "Restoring a 1951 BUSH TV22 Television" http://www.radiocraft.co.uk/906.htm so I tryed tried it and maneged managed to pull the badly perished rubber inner cables out and replace with moden PVC cable, I tied the ends up with self-amalgamating rubber tape, I love that stuff.

tonight Tonight I desided decided to open the contrast pot and see how bad it is, I found the wiper badly corroded and the end of the track damaged and the brass wiper ring was also corroded so I cleaned the wiper ring carefully with a bit of brillo Brillo pad, I cleaned the track with cotten cotton wool buds and contact cleaner, I cleaned the wiper with a bit of brillo Brillo pad and thern then cotten wool buds and contact cleaner.
where Where the track was damaged I would could see the end of the brass contact, I scraped it clean, then cleaned it with isopropyl and filled the hole with wire glue, the pot also had a pach of bad rust inside, I used a bit of brillo Brillo pad in it, dryed dried it and panted the pots pot's case inside and out with wood varnish, when it was dry I reassembled it and tested it, its it's labled labelled 1Mohm lin but its it's 1.125Mohm thats ok OK, I also tested dvm DVM and with my avo AVO multiminor mk4 that terned turned out to be broken was very fiddly and took ages to fix. it It had a broken controll control and burnt out wire in board resister resistor and track resister resistor, I will have to do some more work on it some time.

After after all that work I have the pot working, and ready to be used
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Old 25th Jan 2013, 9:25 am   #25
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Default Re: My Bush tv43 restoration

Have you powered up the set yet, you need to establish if the tube has any life in it really before the time effort and money?
Whilst we hear of sucess stories most of the time on the forum, there are a fair percentage of sets that are beyond immediate repair/restoration either because of the tube being flat or a transformer failure or similar. First light is exactly that, getting light on the screen to prove it.
It's quite a fun process waking them up, measuring, smelling, watching,____standing back
I dont wish to sound negative though, you're doing a great job so far.


Steve
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Old 25th Jan 2013, 10:04 am   #26
audion_1908
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Quote:
Originally Posted by G3JZF_John View Post
I have just "won" a TV36C (TV 43 series)and will shortly be picking it up from the seller in Derby. I did not want a 23inch set so if it is in a poor state, I may break it up for spares.
I have just finished restoring a TV62 (14" bakelite job) and it is now working very well. When I got that one, it was very dirty inside and out. I had to re-wire much of it and replace the waxies. There was a short between the EHT rectifier heater winding and earth and the transformer was half melted. Fortunately, I was able to sort it out and it is now fine.
Regarding the Raspberry Pi, I have one of these and was hoping to use it to generate 405 video, but my son says it can't be done because the graphics firmware does not support this standard. I'd be pleased to hear how others do get on. John
Hhow did you fix the crtCRT problem on the tv62 TV62? Ggood luck with the Bush TV36C are you going to document the repare repair job? Iit would be sad to break it up for spares.
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Old 25th Jan 2013, 10:18 am   #27
audion_1908
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Quote:
Originally Posted by freya2871 View Post
Have you powered up the set yet, you need to establish if the tube has any life in it really before the time effort and money?
Whilst we hear of sucess stories most of the time on the forum, there are a fair percentage of sets that are beyond immediate repair/restoration either because of the tube being flat or a transformer failure or similar. First light is exactly that, getting light on the screen to prove it.
It's quite a fun process waking them up, measuring, smelling, watching,____standing back
I dont wish to sound negative though, you're doing a great job so far.


Steve
I know I should test the CRT first but the wiring was all rotten and shorted and if any of the grid coupling capacitors where leaky thay they would have damaged the valves, I now have a valve tester but it also needs work, when I have it working I will test all the valves and hook the CRT up to it.
Sso far I have lost count of the fails that I have fixed that could have damaged the tv TV, and a few months a go I had a sprise surprise when a filter in my 1980 commputer a commodoreCommodore 8032 exploded and filled my flat with bitter evil smoke
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Old 25th Jan 2013, 10:30 am   #28
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Default Re: My Bush tv43 restoration

Wwhat type of diode is this? Iit is only listed as CD1?
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Old 25th Jan 2013, 10:34 am   #29
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Default Re: My Bush tv43 restoration

Mmain RF board, and this is after cleaning!
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Old 25th Jan 2013, 10:41 am   #30
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Default Re: My Bush tv43 restoration

Yes, certainly obtain first light ASAP. The TV43 can be a beast to work on due to complicated chassis removal and tag board construction. Many mistakes can be made if you tackle all the problems in one go. Follow the service manual. Watch the cleaning. You may break things.
The MW36-24/44 tube often suffers from a partially shorted heater. [See other recent threads.]
On the good side the remaining TV43's including the transformers appear to have survived well.
I think I would have needed a disguise while pushing that sack barrow at the station.
It's a wonder it was not seized and safely disposed of by the railway superintendent.
Mind you my perambulator filled with TV receivers being pushed across the Merton Park level crossing back in 1960 comes a close second..
Good luck with it.
Regards, John.
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Old 25th Jan 2013, 10:46 am   #31
Freya
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Default Re: My Bush tv43 restoration

Think you will find its a germanium vision detctor diode.

Steve
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Old 25th Jan 2013, 10:48 am   #32
audion_1908
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Default Re: My Bush tv43 restoration

I like the yellow capacitors as they are rated at 630v that at least 130v over the old wax capacitors, thay have long leads and anyone can tell they are new, I have been fitting a lot of them.

I tryed to pull the rubber wires out of the cloth sleeve so I could replace with PVC, but the old cable disintegrated, so I have used modern reproduction cloth coverd flex that is a good match to the old, I love that self amalgamating rubber tape.

The cooked looking resistors are fine!
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Old 25th Jan 2013, 11:05 am   #33
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Default Re: My Bush tv43 restoration

I accidentally burnt the sleeving to had to replace it, I have cleaned the switches, the contacts where black!
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Old 25th Jan 2013, 11:19 am   #34
audion_1908
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Default Re: My Bush tv43 restoration

Quote:
Originally Posted by freya2871 View Post
Think you will find its a germanium vision detctor diode.

Steve
But what type would be a good replacement? or is it not to too fussy?

Last edited by audion_1908; 25th Jan 2013 at 11:33 am. Reason: Too meny BB's
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Old 25th Jan 2013, 11:32 am   #35
audion_1908
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Quote:
Originally Posted by Heatercathodeshort View Post
Yes, certainly obtain first light ASAP. The TV43 can be a beast to work on due to complicated chassis removal and tag board construction. Many mistakes can be made if you tackle all the problems in one go. Follow the service manual. Watch the cleaning. You may break things.
The MW36-24/44 tube often suffers from a partially shorted heater. [See other recent threads.]
On the good side the remaining TV43's including the transformers appear to have survived well.
I think I would have needed a disguise while pushing that sack barrow at the station.
It's a wonder it was not seized and safely disposed of by the railway superintendent.
Mind you my perambulator filled with TV receivers being pushed across the Merton Park level crossing back in 1960 comes a close second..
Good luck with it.
Regards, John.
I have been using the free Service manual from http://www.thevalvepage.com/tv/bush/tv43/bushtv43.htm
but I have found a diffrent one at http://www.radiomuseum.org/r/bush_tv43tv_4.html you have to log in to get it, I will see if my mystery diode is in there!

and I have moved much more strange things
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Old 25th Jan 2013, 12:18 pm   #36
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Default Re: My Bush tv43 restoration

Quote:
Originally Posted by audion_1908 View Post
Quote:
Originally Posted by freya2871 View Post
Think you will find its a germanium vision detctor diode.

Steve
But what type would be a good replacement? or is it not to too fussy?
Found it the mystery diode is a oa70
the other Service manual from had the info http://www.radiomuseum.org/r/bush_tv43tv_4.html lists

"In 1953 two types were produced distinguished by the conductivity of the germanium used:
OA70 using higher conductivity germanium designed as a video detector OA50, OA51, OA53, OA55, OA56 and OA61 selected and graded from production" https://sites.google.com/site/transi...turers/philips

they seem to be selling for 4 with postage for a black OA70? I will have to look up OA70 Equivalents

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Old 25th Jan 2013, 12:46 pm   #37
G3JZF_John
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Default Re: My Bush tv43 restoration

Hi there Audion 1908

The coils in the modulator can certainly be replced by similar ones. You will have to take turns off the windings of the IFT's to get them on to 45MHz.
I used iron dust toroids in mine. If you can't get the integrated circuits, let me know. I have a couple in my box.

I will be writing up the restoration project on the TV62 because I have promised to give a talk to Sutton Coldfield Radio Society in a few weeks' time. The set is working really well with a modest amount of boost to the heater. It still does have a partially shorted heater but not by half.

Regarding the TV36C (17" not 23" as I said), The seller says he would like to see it restored - not broken up for parts. I am arranging to collect it next week and will decide then how to proceed.

John
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Old 25th Jan 2013, 1:40 pm   #38
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I dont know a lot about iron dust toroids exept there are a lot of diffrent types and sizes!
it is good to hear that the TV62 is going well, and hope the talk goes well, I was asked years ago to do a talk on my diy carbon resisters and wax capacitors, I did not do the talk in the end.
and I have found wood plasticizer very usefall of badly rotten wood you may need some for the TV36C, good luck with getting the TV36C fully working

thanks but I can get the integrated circuits, I have only done a quick look but 2.50 each on ebay
I would love to read about you restoration project on the TV62
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Old 25th Jan 2013, 1:46 pm   #39
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Default Re: My Bush tv43 restoration

OA90 or OA91 should be ok.
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Old 25th Jan 2013, 2:12 pm   #40
audion_1908
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This is why I have not tested the electrolytic capacitors, I have just replaced all of them, if I can I am leaving the dead electrolytic capacitors in the tv, just disconected, some future restorer may want to stuff them! and the new electrolytic capacitors may only be good for 20 or 30 years max!!

I found one Hunts capacitor, and two of the formerly red ceramic capacitors have got completely burnet, I have replaced them with 630v orange drop capacitors, I dont know if the old capacitors have damaged anything, they where used for heater decoupling so I may have a few open circuit heaters in the chain?

should I worry about the other red ceramic capacitors as a lot have crackes where the wires enter, could damp have crept in?
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