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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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28th Jul 2020, 2:37 pm | #21 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
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Re: Bush TV22A Restoration
Just noticed you have a couple of RS or Dubilier capacitors on one of the pictures. These are obvioulsy replacements, but are likely to be every bit as bad as the originals - also they might not be the correct values. However I expect they were due for replacement!
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28th Jul 2020, 3:28 pm | #22 | |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
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Re: Bush TV22A Restoration
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and an (AMD) ATI Radeon HD 2400 XT will work with Windows 7 & 10 (and possibly XP too, I haven't tried). It's not that the OS is incomparable with the card, rather it's the required driver is incompatible with WinModelines Both these cards are dirt cheap on Ebay, but make sure the DMS-59 - 2X VGA adaptor cable is included.
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29th Jul 2020, 5:44 pm | #23 |
Pentode
Join Date: Jul 2020
Location: Staines, Surrey, UK.
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Re: Bush TV22A Restoration
Thanks Graham
I'll give it a go. Are there any audio/video sync issue you have noted? Simon |
30th Jul 2020, 9:44 am | #24 | |
Tetrode
Join Date: Mar 2020
Location: Newton Abbot, Devon, UK.
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Re: Bush TV22A Restoration
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30th Jul 2020, 4:35 pm | #25 |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 5,000
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Re: Bush TV22A Restoration
Has anybody mentioned drying out the line transformer before any power ups?
Depending on known history as to whether it was stored in a warm centrally heated house, or in a damp loft or shed. Getting first light quickly with the minimum of component changing is the only correct way to do things. Once the state of play has been confirmed, the rest of the likely bad capacitors etc. can then be replaced, taking care to avoid mistakes. Edit: It's 'valves' here in the UK, not 'tubes' - that's the thing the picture is produced on, ie, CRT = cathode ray 'tube'. |
30th Jul 2020, 8:50 pm | #26 | |
Dekatron
Join Date: Mar 2008
Location: Worthing, West Sussex, UK
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Re: Bush TV22A Restoration
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there is plenty of inf on this forum. You are lucky that this set uses the later transformer, which is much more reliable than the earlier types. Mark |
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30th Jul 2020, 8:55 pm | #27 |
Dekatron
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
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Re: Bush TV22A Restoration
If the set has been been stored in a spare bedroom (for all intents and purposes a warm place) is this procedure still necessary? My set is the 22A so from what you say must have the later trannie. What would you do in my case?
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31st Jul 2020, 1:17 am | #28 | |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
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Re: Bush TV22A Restoration
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There's plenty to do on a restoration before you need the LOPTX installed. A 12v wall-wart PSU will drive 40mA through typical 300R overwind according to Mr Ohm, just leave it hooked up as long as you can.
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31st Jul 2020, 8:44 am | #29 | ||
Tetrode
Join Date: Mar 2020
Location: Newton Abbot, Devon, UK.
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Re: Bush TV22A Restoration
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It's been in a warm house for 3 weeks at least - would that be sufficient time to dry out? Will ask where it has been stored before that. Thanks |
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31st Jul 2020, 4:12 pm | #30 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,991
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Re: Bush TV22A Restoration
The Line output transformer will have absorbed moisture from the air over the last 60 or so years, its a very gradual process even when stored within a house. using the method described above will introduce heat in the winding which will drive the moisture out, it can take several days.
The effect you would see if the transformer was saturated would be the raster getting darker and darker until it's not visible anymore because the EHT is being damped because of the moisture.
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31st Jul 2020, 5:49 pm | #31 |
Dekatron
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Location: Warnham, West Sussex. 10 miles south of DORKING.
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Re: Bush TV22A Restoration
Great advice that must be followed to get a result. Surprisingly bedrooms can be quite damp due to exhalation of breath during the night especially in the winter. Much better of course than a cold loft or damp shed but you still have to take precautions.
The 'A' version is very nice. We have an example at the museum brought back to life by my partner in crime Peter Sanders. [Petertheorgan] It's very crisp and bright. You don't see many of this version with the completely revised circuit and layout. John. |
5th Aug 2020, 8:19 am | #32 | |
Dekatron
Join Date: Mar 2008
Location: Worthing, West Sussex, UK
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Re: Bush TV22A Restoration
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You only have to remove the transformer if you go down the route of drying it out in the airing cupboard for a few weeks, personally I prefer leaving it in situ and applying current from my bench PSU. Mark |
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5th Aug 2020, 1:27 pm | #33 |
Dekatron
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Location: W.Butterwick, near Doncaster UK.
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Re: Bush TV22A Restoration
They certainly absorb moisture, as in a lot of cases the pitch is cracked for starters.
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29th Mar 2021, 7:30 pm | #34 |
Tetrode
Join Date: Mar 2020
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Bush TV22A Restarted Restoration
Lots of excuses why I parked this for 9 months but none of interest. But the previous thread is closed so will start a new one as i will still need lots of help please.
Anyway over the last couple of weeks I have completed the recapping and fired the set up for the first time (slowly of course). Fortunately so far there is no smoke and all the valves are lit up and the tube is showing a very bright raster - although quite off centre - about 20% of the tube lacks coverage on the right. Suspecting some resistors have drifted in value so will check these next and see if this is the cause of the position issue. |
29th Mar 2021, 8:02 pm | #35 |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
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Re: Bush TV22A Restarted Restoration
You can ask the moderators to reopen the thread (they don't bite)! Possibly even combine this one with the old thread and close this??
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29th Mar 2021, 10:29 pm | #36 |
Moderator
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Re: Bush TV22A Restoration
Thread reopened thanks to a suggestion by Sideband
Cheers Mike T
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29th Mar 2021, 10:53 pm | #37 | |
Dekatron
Join Date: May 2010
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Re: Bush TV22A Restarted Restoration
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Don't worry about the off-centre raster, it would be a miracle if it didn't need some adjustment after 60 years. Have you acquainted yourself with the ion-trap, centring magnet and focus magnet yet?
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30th Mar 2021, 8:58 am | #38 |
Heptode
Join Date: Jun 2006
Location: Ware, Hertfordshire, UK.
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Re: Bush TV22A Restoration
Hi Ben,
That's great that you've had first light. I'm with everyone else on this, try moving the ion trap magnet first to see if that cures your picture shift/corner shadowing issues. Back i the day when I had my own website, (Andy Valve's website), I used to recommend the TV22A over the TV22 for ease of restoration, due to the reliability of the line output transformer and the absence of the TV22's fragile frame blocking oscillator transformer. I've restored a few TV22s, but only one TV22A. The performance seemed to be pretty much the same as the TV22, the only difference being the reliability. BTW, the next evolution of the design, the TV43 (I have a similar T36) kept the nice line output transformer, but inexplicably brought back the nasty frame blocking oscillator transformer and had a frame output transformer with the same primary winding as the unreliable one from the TV12. The TV43 series are really different to get apart for servicing due to the tuning controls on the side of the RF unit. I'm glad that Bush had the sense not to persist with it and instead came up with the excellent TV53/56/62 chassis. As such it was the end of the TV22s stacked chassis layout, but better suited to the larger CRTs that were cabinet mounted as opposed to chassis mounted. Anyway, all of that waffle was a way of saying that in my opinion, the TV22A was Bush's best stacked chassis. design. Cheers Andy
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30th Mar 2021, 12:41 pm | #39 |
Tetrode
Join Date: Mar 2020
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Re: Bush TV22A Restoration
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30th Mar 2021, 12:43 pm | #40 | ||
Tetrode
Join Date: Mar 2020
Location: Newton Abbot, Devon, UK.
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Re: Bush TV22A Restarted Restoration
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