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Old 31st May 2007, 10:53 pm   #1
FERNSEH
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Default Ferguson 989T 1951 16" TV restoration.

This is gonna be a easy restoration job.

The Ferguson 989T is a 16" round CRT console receiver.

The CRT is the Mullard MW41-1 which is a metal cone tube and has a round flat faceplate.
It can be seen from the photos the set has had very little work done it during it's life. Only two valves have been replaced, perhaps sometime in the late 50s. They are the PL81 line output valve and the boost diode, a PY80.

The only components replaced to achieve the results shown the third picture are the 40 ohm surge resistors which are connected to the two PY82 HT rectifiers and the boost capacitor.

Just look at all those waxies.

DFWB.

DFWB.
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Old 1st Jun 2007, 8:33 am   #2
Heatercathodeshort
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Default Re: Ferguson 1951 16" TV restoration.

Hello David,
That is a surprise to see a bright raster. The MW41-1 does give one of the best pictures when in good condition. The 989T is a well made set, as all Fergusons, and easy to get going.
Another Ferguson model to use the 41-1 is the 990T. This is a console with doors and full flywheel sync.
Regards John.
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Old 1st Jun 2007, 1:48 pm   #3
FERNSEH
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Default Re: Ferguson 1951 16" TV restoration.

I'm making good progress with this set. The vision circuits are working. It is now displaying a picture of sorts. However, the sound has gone.

Those waxies are going to be replaced.

DFWB.
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Old 1st Jun 2007, 9:13 pm   #4
FERNSEH
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Default Re: Ferguson 1951 16" TV restoration.

I've replaced all the wax capacitors in the frame timebase and now the set has more than sufficient height. Also, the problem of vertical non linearity has been solved.
The frame linearity control in this set varies the cathode bias of the PL82 output valve. It's an arrangement I have never liked because the of the interdependence of the height and linearity controls.

The attached images show the bright picture on the screen of the CRT.

DFWB.
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Old 2nd Jun 2007, 12:11 am   #5
Zelandeth
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Default Re: Ferguson 989T 1951 16" TV restoration.

What an interesting CRT...hope that one day I'll get to see one of them in person. Had heard of metal cone tubes before, but I think that's the first time I've ever actually seen a good picture of one...never mind in use.

Looks like the restoration's going well so that though. Will be following this one with interest.
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Old 2nd Jun 2007, 11:39 pm   #6
FERNSEH
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Default Re: Ferguson 989T 1951 16" TV restoration.

The Ferguson 989T I'm restoring is fitted with a Ferguson type B1 Band 3 converter unit.
The converter has three controls. Two are for the user and one preset control. The user controls are a three position channel selector which can tune to two preset Band 3 channels and return the set to Band 1.
The other user control is the Band 3 fine tuner.
The pre-set control is an RF gain pot.

The converter has it's own power supply unit. The tuner valves are UCC84 and UCF80. The converter HT rectifier is an UY41. The 0.1 amp valve heaters are connected in series.

When operated on band 1 the original RF amplifier and frequency changer are employed. On Band 3 the HT supply to the Band 1 tuner is disconnected.

The converter will remain with set. I know many TV restorers prefer to remove converter units but in the case of this set I'd rather leave the unit in place. After all it is the correct unit for the set.

DFWB.

DFWB.
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Old 12th Jun 2007, 10:21 pm   #7
FERNSEH
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Default Re: Ferguson 989T 1951 16" TV restoration.

The electrical restoration has been completed and the chassis and the band 3 tuner unit have been reinstalled into the cabinet.

The CRT is holding up well.

DFWB.
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