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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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6th Feb 2017, 4:18 am | #61 |
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Re: Bush TV22 Mk 1
If the speaker cone is flapping around due to the centralising support being detached, that's an easy glue job, pop the dust cover off the cone center, 3 or 4 strips of paper down the gap to centralise the cone and dabs of glue to the support, I use UHU, it sticks well and quickly.
I've got quite good at fixing speakers, had lots of practice! I have even replaced a cone in one, using the original coil. |
6th Feb 2017, 9:13 am | #62 |
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Re: Bush TV22 Mk 1
It can be easier to rotate the whole CRT than going through the mental and physical stress of trying to "unsticK" scan coils that refuse to move!
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6th Feb 2017, 12:25 pm | #63 |
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Re: Bush TV22 Mk 1
If it's the scan coils that need adjusting, I think I'll leave them alone for now in case of damage.
Regarding the tuning control: does anyone know if the core can be removed completely by screwing it out? It feels like it would screw out if I kept turning, but I want to be sure this won't disturb anything inside. A replacement knob will be easier to fix to the shaft when it's out of the set. |
6th Feb 2017, 4:57 pm | #64 |
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Re: Bush TV22 Mk 1
The knob is fitted last, the tuning core and what shaft you have left could be screwed in all the way, hence releasing the shaft and core together.
I have tried to disassemble mine but without taking the knob off its impossible to remove. Its not obvious how the knob is attached to the shaft given the spring is under a fair bit of tension, its not a simple press fit. You could remove the shaft and carefully cut a screwdriver slot to allow this method of tuning.
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Stephen _________"It`s only an old telly" ___ |
6th Feb 2017, 4:59 pm | #65 |
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Re: Bush TV22 Mk 1
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6th Feb 2017, 5:20 pm | #66 |
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Re: Bush TV22 Mk 1
I'm not sure I understand this. Do you mean I should screw the core inwards to remove it rather than out? I'm concerned about letting it go too far in in case I can't get a grip to turn it! When withdrawing the shaft outwards I've noticed it starts to feel slack at the extremity and the brass thread can be seen.
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6th Feb 2017, 5:32 pm | #67 |
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Re: Bush TV22 Mk 1
The coils can be "unstuck" by heating them. Just pass about 1amp DC through them for an hour or so and they should be easy to rotate with no stress on the CRT. The problem with rotating the CRT is that if the set has been used a lot in the past, then the phosphor could have a rectangular "burn" which will show up when the tube is rotated - this happened to me.
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6th Feb 2017, 6:26 pm | #68 |
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Re: Bush TV22 Mk 1
Yes I do mean screw inwards, the core is very visible from the component side so should be easy to remove the shaft, going outwards the core will bottom out so to speak.
If your concerned about removal then I would advise just cutting a slot with the shaft in situ.
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Stephen _________"It`s only an old telly" ___ |
7th Feb 2017, 11:20 am | #69 |
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Re: Bush TV22 Mk 1
Thanks Brian, that's a useful tip.
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7th Feb 2017, 11:43 am | #70 |
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Re: Bush TV22 Mk 1
I'm hoping it won't come to that but good to know if it does!
Last night I had another go and I've decided to leave the picture adjustments until I get the brightness pot replaced. The controls are far more interdependent than I expected, never having used a set of this age before. Both the contrast and the focus lever have a significant effect on picture rotation. I’m wondering if the lack of brightness control is what’s preventing me aligning the image. The horizontal hold is also a bit of an enigma to me. It doesn’t seem to do much until it is turned fully anticlockwise, at which point the picture breaks up. Is this normal? |
7th Feb 2017, 6:51 pm | #71 |
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Re: Bush TV22 Mk 1
For the line hold at one end I suggest you check the 68k resistor connected to the line hold, R28 on the Trader.
I would wait for the brightness control before doing much to the picture alignment. Use the test card for setup and aim to get the brightness and contrast correct first, then focus.
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Stephen _________"It`s only an old telly" ___ |
9th Feb 2017, 1:43 pm | #72 | |
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Re: Bush TV22 Mk 1
Quote:
Cheers Liam |
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9th Feb 2017, 1:49 pm | #73 |
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Re: Bush TV22 Mk 1
Sounds like you have a good sync lock on the horizontal. Tack a 330k resistor across R28 to see if it puts the lock back in mid travel.
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9th Feb 2017, 2:49 pm | #74 |
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Re: Bush TV22 Mk 1
In post #54 picture 3, has the vertical line gone now or is that still present ?
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Stephen _________"It`s only an old telly" ___ Last edited by Freya; 9th Feb 2017 at 2:51 pm. Reason: found picture |
9th Feb 2017, 3:02 pm | #75 |
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Re: Bush TV22 Mk 1
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9th Feb 2017, 3:05 pm | #76 |
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Re: Bush TV22 Mk 1
That's interesting because i have the same line in the same position on an Ekco set (TS105), it moves left and right with the line hold control using any video source on the Aurora or Dinosaur converters. Yours is the first set I have seen it on other than mine.
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Stephen _________"It`s only an old telly" ___ |
9th Feb 2017, 3:24 pm | #77 |
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Re: Bush TV22 Mk 1
I'm fairly sure it only happened using the Xbox. The other sources I tried were the aurora test card and a DVD player, both of which seemed to display without the line. The test card image in post #54 was taken with pretty much the same settings on the TV and the line doesn't appear to be there. I don't think I tried the line hold at that stage so I'm not sure if it moved as you describe.
I haven't tried the Xbox again since correcting the sound-on-vision interference. |
9th Feb 2017, 4:37 pm | #78 |
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Re: Bush TV22 Mk 1
This was a picture I took a while back with the Ekco showing the same vertical line, I wont hijack your post any more though.
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Stephen _________"It`s only an old telly" ___ |
9th Feb 2017, 6:52 pm | #79 |
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Re: Bush TV22 Mk 1
I sometimes get the line on my TV12 depending on the way I've got the contrast set.
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10th Feb 2017, 10:46 am | #80 | |
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Re: Bush TV22 Mk 1
Quote:
Cheers Liam |
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