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Old 25th Jan 2013, 2:28 pm   #41
audion_1908
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Default Re: My Bush tv43 restoration

I fitted new reproduction cloth covered flex to replace the perished rubber one, I still need to order some type x capacitors as I ordered the wrong size.
I have cleaned it all up and its looking great.

are the two capacitors in the middel mica? they look like "m3"

"Some lots of the M3 type can be found out of tolerance, when silver layers are cracked and partially insulated from the leads. Note that the block packages of types M1 or M2 was also used for paper film capacitors: the identification of dielectric for capacitors with rectangular cases is not easy for capacitance values greater than few nanofarads." http://www.radiomuseum.org/forum/rep...apacitors.html

and there are other capacitors with rectangular cases that possibly are not mica!

dose the ECL80 need a can?
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Old 25th Jan 2013, 2:53 pm   #42
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Default Re: My Bush tv43 restoration

work in progres, I spent a lot of time cleaning it all, I used cotten wool buds and isopropyl before I started work on replacing components and perished wires, all the new wire are routed as close as I could to the root the old ones took.

I do have the cover for the switch unit, I had to cut the EHT lead to get the boards out, the EHT connecter on the crt will not cone out and I dont want to force it! I was going to replace it but for now I will solder it and tape with some silicone self-fusing tape that is good for 8kv per layer

where is good to get an EHT lead?
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Last edited by audion_1908; 25th Jan 2013 at 3:06 pm. Reason: Missing t
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Old 25th Jan 2013, 3:13 pm   #43
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Default Re: My Bush tv43 restoration

The bush tv43 EHT uses plastic frame to hold the LOPT and EY51 and switch and the plastic was cracked and broken, I have used two part epoxi to hold it together, I dont know how well epoxy will do at 10KV
the LOPT looks ok and it has had some time to dry in my flat.

how do I make shore the ey51 is the right way round I thought it was directly heated but its not
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Old 25th Jan 2013, 3:36 pm   #44
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Default Re: My Bush tv43 restoration

The wax capacitors I have replaced so far!
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Old 25th Jan 2013, 4:34 pm   #45
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Default Re: My Bush tv43 restoration

the transformer listed as T4 and a line blocking oscillator in the Service manual from http://www.thevalvepage.com/tv/bush/tv43/bushtv43.htm it is connected directly to HT and earth, what worries me is the perished rubber transfomer insulaters,
should I worrie?
where can I get new replacement transformer insulaters?
can the serial number tell me when it was made?
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Old 25th Jan 2013, 4:51 pm   #46
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Default Re: My Bush tv43 restoration

Yes moisture could have crept in but depends how far into the body the crack is.If its at the very ends could be ok.
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Old 25th Jan 2013, 5:07 pm   #47
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Default Re: My Bush tv43 restoration

Those are there to help reduce the vibration transmitted to the chassis from the transformer, so far as i know they serve no electrical purpose.


I still think you should be trying a power up, replacing all those capacitors could have introduced potential fault that would be tricky to find. Whilst your right to replace the wiring and the decoupling caps, its after that stage a power up would normaly be carried out. If you do it that way you learn as you go along, seeing which capacitor restores frame etc.


Steve

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Old 25th Jan 2013, 5:35 pm   #48
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Quote:
Originally Posted by HamishBoxer View Post
Yes moisture could have crept in but depends how far into the body the crack is.If its at the very ends could be ok.
it is just at the ends of the red ceramic capacitors, but most are like it
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Old 25th Jan 2013, 5:38 pm   #49
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Default Re: My Bush tv43 restoration

Try them when its fired up or disconect one or two and check for any leakage on the Ohmns range of a good multi meter.Should be zero leakage.
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Old 25th Jan 2013, 5:47 pm   #50
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Originally Posted by freya2871 View Post
Those are there to help reduce the vibration transmitted to the chassis from the transformer, so far as i know they serve no electrical purpose.

I still think you should be trying a power up, replacing all those capacitors could have introduced potential fault that would be tricky to find. Whilst your right to replace the wiring and the decoupling caps, its after that stage a power up would normaly be carried out. If you do it that way you learn as you go along, seeing which capacitor restores frame etc.

Steve
why would a transformer have a problem with vibration? if thats all then its fine.
I would like to plug it in and test it but I dont have a sorce of 405 lines and I still have to fix the EHT lead and the connecter to the CRT, and replace the perished scan coil wiring, I am not looking forward to messing with the CRT I have seen to many youtube clips of ealy CRTs imploding
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Old 25th Jan 2013, 5:49 pm   #51
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Quote:
Originally Posted by HamishBoxer View Post
Try them when its fired up or disconect one or two and check for any leakage on the Ohmns range of a good multi meter.Should be zero leakage.
I only have dvm's and analog meters that would test them at low voltage, but I could probly rig something up, good Idear.

I only have DVM's and analogue meters that would test them at low voltage, but I could probably rig something up, good idea.
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Old 25th Jan 2013, 6:08 pm   #52
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Default Re: My Bush tv43 restoration

In post #42, picture 3, What have you replaced C26 0.001uF and C31 75pF with ?

Also C25, i think should be 0.001uF ?

(The alternative part number mentioned AP22746 relates to 1000pF 350v)

Nice tidy work so far, good pictures

Stephen
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Old 25th Jan 2013, 6:34 pm   #53
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C26 is 0.005uf and C31 is 0.01uf and are used together 0.01uf + 0.005uf = 0.015uf
302k=0.003uf, 103k=0.01uf, 102k=0.001uf, 102k=0.001uf, total of 0.015uf

C25 is 0.2uf and I fitted two 104k that are 0.1uf each

it all look ok to me, c35 need to be 3uf and it has only 1uf as the pack of 1uf capacitors are in the post and I still have to order some small electrolytic capacitors.
where are you getting c25 as 0.001uf and c32 as 75pf?

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Old 25th Jan 2013, 6:43 pm   #54
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Default Re: My Bush tv43 restoration

I just went with what was on the board, replacing like for like and checking agents the service sheet. I think only one capacitor is a different value from the service sheet, and that's on the RF board and I have not replaced it but when I will fit the same value as the board has.
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Old 25th Jan 2013, 6:43 pm   #55
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Default Re: My Bush tv43 restoration

Ok, i was looking at the original bush service intructions.
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Old 25th Jan 2013, 6:59 pm   #56
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Quote:
Originally Posted by freya2871 View Post
In post #42, picture 3, What have you replaced C26 0.001uF and C31 75pF with ?

Also C25, i think should be 0.001uF ?

(The alternative part number mentioned AP22746 relates to 1000pF 350v)

Nice tidy work so far, good pictures

Stephen
I am glad you like my work, but it's always good to have it checked.
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Old 25th Jan 2013, 11:21 pm   #57
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I can't wait to sit down with some popcorn and watch the original Doctor Who on my Bush TV43.
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Old 26th Jan 2013, 1:18 am   #58
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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
can you post some pc's of your 405 line modulator?
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Old 26th Jan 2013, 11:12 am   #59
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Default Re: My Bush tv43 restoration

Do you mean Pictures or Printed Circuits.
I will dig it out -not used it since I bought my Aurora. I built it on a piece of circuit board but not an actual printed circuit.
It would be a good idea to have a printed circuit because the components are cheap and you could have several for different channels.
Any volunteers to draw up the artwork?

John S
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Old 26th Jan 2013, 2:18 pm   #60
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A printed circuit would be great but I was thinking of making a one off using veroboard with the tracks cut short or, if I can find it, I have somthing like veroboard but with no copper tracks. I would like some pictures of your modulator please.
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