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Old 7th Oct 2015, 8:01 pm   #41
Heatercathodeshort
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Default Re: Ferguson 247T: huge console TV set.

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Originally Posted by FERNSEH View Post
Just wait one more week and it will really be a fine set again.DFWB.
You have a problem there David. With that chassis spread over your kitchen table you will probably suffer from malnutrition before you finally get it finished..

Don't forget the PCC84 in the tuner. They tend to develop internal shorts.

John.
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Old 9th Oct 2015, 3:57 pm   #42
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Default Re: Ferguson 247T: huge console TV set.

Found the fault. A replacement capacitor, C134 was found to be leaky. See post #36.

DFWB.
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Old 10th Oct 2015, 9:57 am   #43
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Default Re: Ferguson 247T: huge console TV set.

I'll dig out the old Coronation day flags from the bottom of the wardrobe..J.
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Old 10th Oct 2015, 10:34 am   #44
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Default Re: Ferguson 247T: huge console TV set.

Hi John,
even after replacing the short circuit AGC filter capacitor C134 (which was an LCR make) the vision AGC system was still not working as well as it should. The contrast control did not reduce the picture contrast down to an acceptable level. Replacing the PCC84 RF amplifier improved matters considerably, the valve had a grid to cathode leak. Finally, after replacing the M3 AGC delay diode the AGC system is working as the designer intended to should. This very sensitive receiver can handle very strong signals without any intermodulation effects.
Imagine what this set would have been like if it had been equipped with frame grid valves? The ultimate 405 dx receiver.

DFWB.

Last edited by FERNSEH; 10th Oct 2015 at 10:44 am.
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Old 10th Oct 2015, 3:45 pm   #45
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Default Re: Ferguson 247T: huge console TV set.

All this effort is at last showing encouraging results. The CRT is excellent, as long as the heater remains intact and doesn't go partially short circuit there's plenty life left in it. The scan coil leads will have be reversed.
The picture appears too wide, that's because the width control is stuck in the minimum position so for the time being it has been bypassed.
For the frame output valve I'm using a Mazda 30PL1 in place of the PCL83.
Interlacing is good, Ferguson have taken extra efforts to ensure this by employing an ECL80 as the frame pulse clipper and shaper.
That complex gated AGC system is really good, much better than any mean level system.
So just a few minor jobs to do and this set will be the perfect big screen 405 line receiver.

DFWB.
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Old 10th Oct 2015, 9:23 pm   #46
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Default Re: Ferguson 247T: huge console TV set.

That is an absolute cracker David. The Mazda 30PL1 is a very good valve and puts the Mullard PCL83 to shame. They gave so much trouble in the Pye television receivers that they used up what stock they had in the 'Black Box' record players. They even produced a special mains transformer for the job. They must have had thousands!

A good soak test should sort out any minor problems but I'm sure you will easily solve them.

That picture takes me back. As I mentioned, we had the 17" version back in the 50's. Very rarely broke down until the tube went partial S/C heater.
This was almost as bad as the Mazda problem with H/C shorts but did not appear to create the upset that Mazda quite rightly suffered.

Regards, John.
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Old 10th Oct 2015, 10:46 pm   #47
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Default Re: Ferguson 247T: huge console TV set.

Hi John,
This set is getting better all the time. The line scan coils have been reversed and the width control repaired.
The tuner unit will receive attention next.
That slow heating PY81/17Z3 has to go. Note the ceramic cathode sleeve.
The later PY800 has a much quicker warm up time.

DFWB.
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Old 11th Oct 2015, 3:13 pm   #48
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Default Re: Ferguson 247T: huge console TV set.

Really good focus, contrast and linearity, just a small amount of shading at line rate to sort.
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Old 11th Oct 2015, 3:59 pm   #49
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Default Re: Ferguson 247T: huge console TV set.

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Really good focus, contrast and linearity, just a small amount of shading at line rate to sort.
It's possible that the 0.01mfd CRT A1 supply smoothing capacitor has gone OC. It's C137 in the Ferguson 203T service manual. Another possibility is the line flyback blanking capacitors, C138 and C139. The flyback pulse present at the line scan coils is fed back to the CRT grid through C138 to effect suppression during the line blanking period..

DFWB.
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Old 11th Oct 2015, 4:12 pm   #50
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Default Re: Ferguson 247T: huge console TV set.

I'll go for the blanking caps.. J.
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Old 12th Oct 2015, 1:31 pm   #51
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Default Re: Ferguson 247T: huge console TV set.

C137 and C138 were found to be faulty, both Hunts make.

Ferguson call the 203T series the "Nine Star". Looking through the Radio and Television books the companies' first 12 channel models were all of a high specification having such features as flywheel line sync and high gain IF amplifiers. The earlier 103T series even had the extra refinement of push-push audio amplifiers.

DFWB.
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Old 12th Oct 2015, 6:39 pm   #52
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Default Re: Ferguson 247T: huge console TV set.

I think Ferguson were the only company to manufacture receivers with push pull output stages. The 16" [metal cone tube] 990T series employed two ECL80 valves and the sound was of very good quality. That is a super restoration David. Well worth the end result. J.
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Old 12th Oct 2015, 8:35 pm   #53
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Default Re: Ferguson 247T: huge console TV set.

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That is a super restoration David. Well worth the end result. J.
I'll second that, great picture.
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Old 12th Oct 2015, 9:00 pm   #54
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Default Re: Ferguson 247T: huge console TV set.

I have to say I'm pleasantly surprised how well this restoration has gone. The designer had gone to great pains to make sure the interlace is perfect which is essential for a large screen 405 line receiver. The test card pictures generated by the Aurora are with the equalising pulses (EQ) switched off. No cheating allowed. The set is receiving the standard 405 sync train.
I'm concluding the restoration of a Dynatron "Fulmar". With this set I thought I'd got the interlace spot on, but then I discovered the EQ pulses were present in the sync waveform. After disabling the EQs the interlace was lost, really bad line pairing. A major re-design of the frame sync circuits was called for.
Nothing like that in the Ferguson. Also, unlike many early line flywheel sync systems the picture verticals are perfect. Another plus point is the excellent gated vision AGC system.
A replacement safety window is to be made.

DFWB.
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Old 13th Oct 2015, 5:42 pm   #55
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Default Re: Ferguson 247T: huge console TV set.

Hats off to Thorn/Ferguson David. All that care and attention from the design department often completely ignored by the customers of Dynatron and other exotic brands of the day.
Ferguson always produced a very high quality product including the very best of the early post war radiograms. They take a lot of beating. RIP the service department at Edmonton. John.
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Old 16th Oct 2015, 10:07 pm   #56
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Default Re: Ferguson 247T: huge console TV set.

Behold the magnificent! The new safety glass and the CRT mask have been installed and there is no doubt about it is an impressive looking set.

The MW53-20 tube is 23 inches deep. 70 degree deflection angle.

DFWB.
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Old 17th Oct 2015, 6:09 am   #57
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Default Re: Ferguson 247T: huge console TV set.

That is really nice, a very clear picture.
I am fairly certain that my grand parents had one of these just after ITV started and we were given their 9inch PYE Console set. The PYE Caught fire while we were watching "The Woodentops" and that was the end of that.
Steve
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Old 17th Oct 2015, 12:07 pm   #58
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Default Re: Ferguson 247T: huge console TV set.

I've just been having a look at the first pictures of this set when you started this thread. From that to this in such a short space of time! You certainly don't mess about! I'd forgotten, when we first saw this item it wasn't even a telly, it was a speaker cabinet. Excellent job.

Regards,
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Old 22nd Oct 2015, 1:15 pm   #59
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Default Re: Ferguson 247T: huge console TV set.

I think it is agreed that the tuner unit needs cleaning up, it ain't pretty.
I think that it possible that the oscillator HT feed resistor has gone high in value. The tuner has to be "shocked" in operation by pulling the PCF80 out and back in again or the other trick is to flick the tuner turret fast. These actions seem to kick the oscillator into life again.

DFWB.
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Old 22nd Oct 2015, 4:58 pm   #60
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Default Re: Ferguson 247T: huge console TV set.

The tuner may not look all that nice but actually it's in good condition.

The HT divider resistors R6 and R7 (680Kohms) have risen in value to over 800Kohms so it will be good policy to replace them.
The local oscillator HT supply resistors R15 and R16 (6.8Kohms and 5.6Kohms) are well within tolerance so there is no point replacing them.
Found one badly soldered connection, the yellow wire to the base of the PCF80 FC.

DFWB.
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