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Old 19th Jun 2006, 8:48 pm   #81
jim_beacon
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Default Re: TV22 Restoration

Depending on the type of converter, there may not have been any other mods.

The simplest type pick up HT and LT from the set, and consist of an oscillator and a mixer, downconverting band 3 to band 1.

The more complex ones have all the RF for bands 1 and 3 in a box, and plug in in place of the mixer valve. In this case there may be some small mods to correct gain or voltages.

Jim.
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Old 19th Jun 2006, 10:04 pm   #82
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Default Re: TV22 Restoration

Hi guys....

Well heres the latest and final update on this as far as the picture goes. I need a speaker though, any ideas?

Right I fed my IPOD into the Aurora and got some very crackly sound from the speaker when tuned, using the control on the back, and also adjusting the contrast; to be honest, is much more of a sensitivity control, as it is more an RF gain to be fair.

Once we had sound I guessed it had nothing to do with the band three converter and probably nothing to do with the IF stage as apart from hundreds of waxies, they seem quite indestructible.

So my attention turned to pin 6 of the connector from the IF to the main chassis, and noticed that the yellow wire that goes through the chassis was loose.
I resoldered it and checked the 2 caps above chassis and noticed I had put the cathode of the tube to the wrong side of C21.

Turned it back on and, hey presto, a great stable clean focussed picture...

So, does anyone have a spare speaker for this so I can get it back in its case?

Thanks, everyone, for all of the support and help... I think I am gonna do another one...

Andi
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Old 19th Jun 2006, 10:39 pm   #83
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Default Re: TV22 Restoration

Well done Andi! From the photo that looks like an excellent picture!

What size speaker is it you need? It looks similar to the Celestion one they used in a number of radios in the mid 50s - if it is, I could let you have one.
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Old 19th Jun 2006, 10:41 pm   #84
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Default Re: TV22 Restoration

Hi Paul and thanks for your words, I think its 4" x 6" but can't find a tape or ruler right now, I know it's 3r though.

Andi
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Old 19th Jun 2006, 10:43 pm   #85
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Default Re: TV22 Restoration

Yes Paul the cone is a fraction under 4x6 so the speaker itself would measure 4x6

Regards

Andi...
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Old 20th Jun 2006, 3:35 am   #86
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Default Re: TV22 Restoration

I've been “faffing about” with old tellies for years and that feeling when a stable picture finally appears still takes some beating!
Well done you

The picture looks brilliant - the tube looks very good.
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Old 20th Jun 2006, 3:01 pm   #87
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Default Re: TV22 Restoration

One last picture...

Or maybe two...
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Old 20th Jun 2006, 3:22 pm   #88
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Thumbs up Re: TV22 Restoration

Hi Jarl,

Looks brilliant, and it will look even better when you get it back inside it's case. This stops a lot of the light coming in from behind the tube and so improves the picture greatly. Also you mentioned the phospher being a bit thin around the edges, dont worry about this either as once the picture size is adjusted properly with the case on, you won't notice the very edges of the tube.
Nice repair and i'm glad it all worked properly after the initial aggro that you had.
All the best,
Alan.
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Old 20th Jun 2006, 3:49 pm   #89
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Default Re: TV22 Restoration

Hi guys.

While doing this project I must emphasise more than ever the comments made by others on this site..

1, one component at a time, even though you will have to pretty much change all waxies and most electrolytics.
Don't just cut them all out and wonder where they went. In the days of tag strip even to the circuit usually matches it won't always look like you expect. Earthing points and joins between other components may be nowhere near where you think they should be.

2, no matter how many times you have checked your work, check it again. Two of my faults were cause by me - one wire I had missed completely because it hid behind a transformer. and one that had broken, and again I couldn't see that it was until I tried to move it out of the way.

3, Check previous repairs... they won't always be right...

4 and final tip from me. STAY SAFE. I was so scared of touching the inside of a TV when I first started due to the EHT voltages and possible live chassis; all it takes is a little common sense and they don't have to be half as scary.

Remember, also, to get the best service info you can find and watch out for revisions and modifications that won't always be on the service sheet.

Thanks for reading

Andi
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Old 20th Jun 2006, 3:50 pm   #90
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Default Re: TV22 Restoration

Thanks Alan,

Case is next, just needs to clean the louvres and paint the screen mask. Then a speaker and it should be finished...

Andi
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Old 20th Jun 2006, 4:05 pm   #91
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Default Re: TV22 Restoration

Hi Andi,

Congratulations! Aren't you glad you stuck with it now rather than shoving it on eBay? I never tire of the thrill of bringing something back from the dead; watch out, it's addictive...

After following this thread, I think I'm going to have to give in, save up, and buy a nice, cheap, scruffy, dead, but complete TV22 to resurrect. At least they're fairly small; I shouldn't get into too much trouble if I brought one home... Maybe...

Regards, Kat
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Old 20th Jun 2006, 4:18 pm   #92
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Default Re: TV22 Restoration

Thank you for your comments Kat and it was seeing the ones at the NVCF and your converter that got me to do this in the first place, so thank you for that. Go and find one and good luck, with your technical knowhow I am sure you could do one of these in no time at all...

Let me know if you do maybe I can add any faults you find to My TV22 site once its done..

Andi

PS Yes very very happy I didnt put it on ebay
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Old 20th Jun 2006, 4:38 pm   #93
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Default Re: TV22 Restoration

Well done Andi! I knew you could do it! After seeing this thread I have realised there's a nice 405 line telly nearby going cheap. I might buy it myself! Josh.
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Old 20th Jun 2006, 5:11 pm   #94
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Default Re: TV22 Restoration

Are either of these speakers any use? They are both from Bush radios and are the same size but slightly different style. Both are 3 ohms, and both are 160mm by 110mm (overall chassis size at the front). As far as I know they both work, but I would check before sending.

Fron your photo the left one looks closer.

If you want one or the other send me a PM (saying whether you want the left or right one as shown in the photos) and we can sort out getting it to you. No charge for the speaker - just need to sort out carriage.
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Old 20th Jun 2006, 7:44 pm   #95
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Default Re: TV22 Restoration

OK
So, next question. I realise this tv is almost 56 yrs old but what would be a reasonable amount of use to give it?
Could it actually prove reliable?

Andi
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Old 20th Jun 2006, 8:17 pm   #96
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Smile Re: TV22 Restoration

Quote:
Originally Posted by Jarl Ayari
OK So next question. I realise this tv is almost 56 yrs old but what would be a reasonable amount of use to give it? Could it actually prove reliable?

Andi

Hello there,

The reliability of the TV22 should be very good. Many of the problem components (i.e wax capacitors) have been replaced and valves usually last a suprisingly long time before their performance falls off. As long as you don't cause too much mechanical vibration or put it somwhere where it has little ventilation (gets too hot) it should last many years of good service.

As a resonable amount of use to prolong the life of the CRT an hour or 2 a week would be ok. As a precaution don't leave the set running whilst out of the room for longish periods in case of any faults that suddenly appear.

Christopher Capener
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Old 20th Jun 2006, 8:28 pm   #97
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Default Re: TV22 Restoration

Was more a special tv for watching Dr who once a week and the odd classic film when I have friends round...

So sounds like it should be ok
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Old 21st Jun 2006, 9:29 pm   #98
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Default Re: TV22 Restoration

OK Before and after pics of the same TV.

Cheers & Beers

Andi
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Old 22nd Jun 2006, 6:05 pm   #99
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Default Re: TV22 Restoration

Hi again..

Just when you thought this thread had gone away, you are wrong.

With the chassis in the case and the screen mask fitted I have a gap about an inch to the left of the screen and I have no idea how to get rid of it; the width control helped a little but not enough..

Any ideas?

Andi
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Old 22nd Jun 2006, 6:27 pm   #100
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Default Re: TV22 Restoration

Hi Jarl,
is that a positioning problem or just a general lack of width?
I would always fit a new ECL80 in one of these sets to ensure good drive and try a few different PL38 valves to get the best results. The PZ30 is also a thought.
You could also play with the line drive variable capacitor on the tag board underneath the chassis.

Cheers

Andy
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