Ferranti T1002F - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

HamishBoxer · 30th Jun 2014, 10:52 am

As i stated long ago some where a Thorn 950 smoothing cap (bomb) failed in a D.E.R showroom where i worked and split the cabinet.

Do not remember it being very old.

FERNSEH · 30th Jun 2014, 11:02 am

When investigating any vision AGC faults on these Ekco TV sets the prime suspect is always C7 inside the tuner unit. Along with the smoothing capacitor C7 will be replaced today. The chassis is to be pulled out of the cabinet to get at various other components.

DFWB.

FERNSEH · 30th Jun 2014, 1:38 pm

The AGC decoupler capactor C7 (0.1mfd) was down to a 5Kohms leak. Absolutely useless.

DFWB.

FERNSEH · 30th Jun 2014, 5:47 pm

Lots of hi-viz capacitors were needed to sort out the problems in this chassis.

Frame timebase strangenessness. Faulty 30P12 frame output valve or possibly the valve is over biased? Let's find out.

DFWB.

FERNSEH · 30th Jun 2014, 6:38 pm

The valve was over biased. 15 volts negative was present at the control grid of the 30P12. C101 was found to be leaky. It's 0.25mfd in some sets. In the Ferranti it is 0.1mfd. The faulty capacitor was a TCC "Visconol" 350 volt component. Replaced by another Hi-viz capacitor.

The AGC is working properly and the line sync has also improved. That dodgy HT smoothing capacitor was replaced by a NOS 100 + 200 +16 mfd can.

DFWB.

line sync · 30th Jun 2014, 9:24 pm

Nice job david.
A really nice sharp test card .

Robin

Focus Diode · 30th Jun 2014, 9:48 pm

The picture looks stunning, well done!

Cheers,
Brian

FERNSEH · 30th Jun 2014, 10:05 pm

Hi Robin and Brian,
That's the picture quality one can expect from the these late fifties Ekco and Ferranti TVs. Although big and boxy the Ekco T330 and the similar Ferranti T1002 were well liked by the viewing public. Even the introduction of the "slimline" sets in late 1959 didn't sway owners of these sets to go out and buy a new set.
In fact many of these sets were still in use right up to the end of the sixties.
My favourite Ekco TV was the 21" bow fronted console model. The controls were located on the right side of the cabinet.

DFWB.

mark pirate · 30th Jun 2014, 11:27 pm

Great picture, Ekco sets always work well once sorted. Lots of caps to change in these though. I must get my TC208 back on the bench soon, I had first light and all looks good, but the cabinet is a bit rough

Mark

30th Jun 2014, 10:52 am	#21
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,932	Re: Ferranti T1002F As i stated long ago some where a Thorn 950 smoothing cap (bomb) failed in a D.E.R showroom where i worked and split the cabinet. Do not remember it being very old. __________________ G8JET BVWS Archivist and Member V.M.A.R.S

30th Jun 2014, 11:02 am	#22
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Ferranti T1002F When investigating any vision AGC faults on these Ekco TV sets the prime suspect is always C7 inside the tuner unit. Along with the smoothing capacitor C7 will be replaced today. The chassis is to be pulled out of the cabinet to get at various other components. DFWB. Attached Thumbnails

30th Jun 2014, 1:38 pm	#23
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Ferranti T1002F The AGC decoupler capactor C7 (0.1mfd) was down to a 5Kohms leak. Absolutely useless. DFWB.

30th Jun 2014, 5:47 pm	#24
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Ferranti T1002F Lots of hi-viz capacitors were needed to sort out the problems in this chassis. Frame timebase strangenessness. Faulty 30P12 frame output valve or possibly the valve is over biased? Let's find out. DFWB. Attached Thumbnails

30th Jun 2014, 6:38 pm	#25
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Ferranti T1002F The valve was over biased. 15 volts negative was present at the control grid of the 30P12. C101 was found to be leaky. It's 0.25mfd in some sets. In the Ferranti it is 0.1mfd. The faulty capacitor was a TCC "Visconol" 350 volt component. Replaced by another Hi-viz capacitor. The AGC is working properly and the line sync has also improved. That dodgy HT smoothing capacitor was replaced by a NOS 100 + 200 +16 mfd can. DFWB. Attached Thumbnails

30th Jun 2014, 9:24 pm	#26
line sync Heptode Join Date: Sep 2009 Location: Kinver, Staffordshire, UK. Posts: 634	Re: Ferranti T1002F Nice job david. A really nice sharp test card . Robin

30th Jun 2014, 9:48 pm	#27
Focus Diode Octode Join Date: Jan 2006 Location: Borough of Gateshead, UK. Posts: 1,420	Re: Ferranti T1002F The picture looks stunning, well done! Cheers, Brian

30th Jun 2014, 10:05 pm	#28
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Ferranti T1002F Hi Robin and Brian, That's the picture quality one can expect from the these late fifties Ekco and Ferranti TVs. Although big and boxy the Ekco T330 and the similar Ferranti T1002 were well liked by the viewing public. Even the introduction of the "slimline" sets in late 1959 didn't sway owners of these sets to go out and buy a new set. In fact many of these sets were still in use right up to the end of the sixties. My favourite Ekco TV was the 21" bow fronted console model. The controls were located on the right side of the cabinet. DFWB.

30th Jun 2014, 11:27 pm	#29
mark pirate Dekatron Join Date: Mar 2008 Location: Worthing, West Sussex, UK Posts: 5,185	Re: Ferranti T1002F Great picture, Ekco sets always work well once sorted. Lots of caps to change in these though. I must get my TC208 back on the bench soon, I had first light and all looks good, but the cabinet is a bit rough Mark