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Old 29th Oct 2008, 3:11 pm   #21
Steve_P
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Default Re: Ferguson 606T restoration.

400v caps should be fine here. Change them all in this area and try the set again.

Cheers,

Steve P.
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Old 29th Oct 2008, 8:01 pm   #22
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Default Re: Ferguson 606T restoration.

Hello again Des,
The 100uf electrolitic in the cathode circuit of the frame output valve [C95] is rated at 18v in the manual. A 25v or 50v rating will be fine. As Steve suggests 400v types will be very suitable. You will need to replace C91 .03uf C95 .05uf [.047uf] C92 .02uf C93 .02uf C94 .02uf C96 .01uf C97 .05uf. You may discover the preset contols to be a bit tired. I will probably have a few replacements if you require them. The frame linearity on these models should be to a high standard. Good luck with it. Regards, John.
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Old 2nd Nov 2008, 6:23 pm   #23
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Default Re: Ferguson 606T restoration.

REF: Trader sheet 1494 / T202

Hi,
This weekend I had a go at sorting out my problem with poor frame linearity. First I replaced C93 and C94 and also the cathode electrolytic, no change.C97 replaced, no change. C91 replaced, no change. C92 ( using 0.047uf ) replaced, frame collapse, this was due to my poor soldering of C91, after correction the fault still existed but now with the timebase speed too slow. C96 replaced and gave a dramatic improvement to the linearity. I temporarily replaced C92 with its 0.05uf original and got the correct timebase speed with the improved linearity. I was advised by another forum member that some of the timebases cap values are critical. Until I obtain a ).05uf cap thats it for now. I don't even have suitable caps to double up.
Cheers, Des.
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Old 2nd Nov 2008, 6:47 pm   #24
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Default Re: Ferguson 606T restoration.

Now you need a signal for it!

Cheers,

Steve P.
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Old 2nd Nov 2008, 7:09 pm   #25
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Default Re: Ferguson 606T restoration.

Hi, I've just realised I've made a mistake. I've used 0.47uf instead of 0.047uf for C92 !!!!!.
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Old 2nd Nov 2008, 7:34 pm   #26
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Default Re: Ferguson 606T restoration.

Easily done Des. I made a similar error in a Bush VHF90a radio and wondered why there was virtually no treble

Still, all part of the fun. I can't wait to see a picture on it.

Cheers and...
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Old 3rd Nov 2008, 9:54 am   #27
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Default Re: Ferguson 606T restoration.

Hello again Des,
Not critical as such but .47uf may be stretching it a bit...Most capacitors of this era were rated at 20% tolerance. I once fitted a 15 ohm resistor in place of a 1m ohm. At first glance the colour code looks a similar pattern. Modern replacements will be just fine and will be well within tolerance. .02uf -.022uf .03uf - .033uf .05uf -.047uf These values will give you 100% frame linearity with plenty to spare with the presets. J.
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Old 10th Nov 2008, 2:09 pm   #28
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Default Re: Ferguson 606T restoration.

Right, C92 has now been replaced with a 0.047uf. Frame speed seems to be ok now but linearity still not quite right. I noticed I hadn't replaced C90 0.003uf. I replaced this with three 0.001uf caps in parallel. A slight inprovement, but raster still not quite linear. I swapped the Frame output/half ocsillator with the sound output valve, no change. I should add the top linearity control has no effect on the raster. By the way an Aurora has been ordered.
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Old 10th Nov 2008, 7:43 pm   #29
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Default Re: Ferguson 606T restoration.

Just a quick one Des. The top frame linearity preset should have a profound effect on the picture. Check to see if the actual preset has its carbon track intact. Check your capacitors again to make sure you have them in the right places.You will be delighted with your Aurora. J.
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Old 10th Nov 2008, 8:25 pm   #30
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Default Re: Ferguson 606T restoration.

OK, Thanks John.
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Old 10th Nov 2008, 8:53 pm   #31
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Default Re: Ferguson 606T restoration.

I have just taken a few pictures of my Ferguson 606T. They show the first two with the 'top' lin pot at both extreme settings and the second two with the main lin pot at its extreme settings. As you can see there is loads of adjustment. The only capacitor replaced in mine is C96 .01uf in the top lin feedback loop. The set was used till the end of 405 I believe and of course sets stored in damp conditions may require more to be replaced. The capacitors used in the 600 series are reliable. Hope this gives you some encouragement. Regards, John.
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Old 11th Nov 2008, 12:36 am   #32
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Default Re: Ferguson 606T restoration.

Thanks John,
That's helpful. I'll have a look tomorrow evening. I should point out that although the top half of the picture is stretched there seems to be some bunching of the top few lines.
Cheers .Des.
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Old 11th Nov 2008, 1:16 am   #33
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Default Re: Ferguson 606T restoration.

Just a thought Des, are you viewing a locked raster? If not, there may well be odd effects with the linearity. I'd hang on for the Aurora to check for sure.

Cheers (and well done so far)
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Old 11th Nov 2008, 2:07 am   #34
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Default Re: Ferguson 606T restoration.

The "bunching" is probably foldover (due to a free-running frame osc. as Taz suggested).

The raster looks very non-linear on my Pye 48 (on 405 anyway) when not tuned to a signal.

I can't wait to see your set displaying a picture! Nice work




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Old 11th Nov 2008, 10:07 pm   #35
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Default Re: Ferguson 606T restoration.

Hi, Firstly thanks to all for your replies. I made a mistake, its the overall linearity control that has no effect, not the top one. I did a quick test and in circuit there is a smooth increase in reistance from one extreme to the other on the preset. Thanks again, Des..
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Old 12th Nov 2008, 9:56 am   #36
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Default Re: Ferguson 606T restoration.

OK Des, As Brian and Tas suggest the time has arrived for a signal. We will have to sit on our hands for a while. The main frame linearity control should have some effect and you may have to check your capacitor values and positions. Failing this a hair crack in the P/C board may have happened in transit. R132 may be O/C [unlikely]. An O/C in this area usually produces a large distorted raster. Check that C97 is a .047uf [.05uf]. C95 the bias cap, make sure its connected the correct way round but even if this is incorrect the frame lin pot should do something.. Oh well lets await the postman. Regards, John.
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Old 12th Nov 2008, 10:04 pm   #37
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Default Re: Ferguson 606T restoration.

This evening I was looking at the Trader sheet. Rememember C92, I did exactly the same thing with C97 and yes John changing this has given controllable linearity which I can get to a good standard. I need to take more notice of these cap values !!!!! I was working out the last time I worked on a vintage TV was 1995. That's my excuse !!!! Yes I think now's the time to wait for the converter. Thanks again to you all for your replies.
Cheers, Des.
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Old 12th Nov 2008, 10:29 pm   #38
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Default Re: Ferguson 606T restoration.

Now I can sleep soundly tonight. Great news Des. I think it will be a cracker! J.
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Old 12th Nov 2008, 11:49 pm   #39
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Default Re: Ferguson 606T restoration.

Hi Des

With regards to the reliablity of these sets, I would like to second the comments on this post. I restored one of these sets for a pub in Southend over a year ago. It is used daily with old tv progs shown for the regulars! They are over the moon with it and have reported no problems. The picture is bright and is using the original crt.

Good luck with it, they are well worth the effort,it was one of the best pictures I had seen for a long time.

Regards
Rob
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Old 16th Nov 2008, 12:07 am   #40
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Default Re: Ferguson 606T restoration.

Hi, My Aurora arrived today. Just run the Fergy with it briefly and here's a couple of pics. Tomorrow I'll make some adjustments to the linearity. I may have a sound problem. More to come.
Cheers, Des.
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