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Ekco TSC91

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FRANK.C
(@frank-c)
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I have always liked consoles, I just love the look of them and this one will be my next project it has been in the tuit pile for a few years now.

The pictures show it as I found it. The finish on the cabinet looks OK in the pictures but in reality that is far from the truth. Someone in the past has painted on some stain leaving deep brush marks going against the grain. Looking through the stain the original finish don't look good it probably had started to flake off.

It can be seen from the photos that the volume pot/on-off switch and it's knob, the speaker, the back and side panels are all missing as well a valve or two. I cant see anything obvious missing from the underside of the chassis, but I cant help wondering why the side panel was removed.

As far as I can make out the tube fitted is a CRM91, it is listed in the service sheet as a CRM92. I believe that HKS restored a Ekco TS46 which had also a CRM91 fitted.

I will probably start on the cabinet first as it is easier to work on and get a good finish while the weather is good. I will be working on it as time permits, so I expect that it will be some time before it will be completed.

Frank


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www.electronics.frankcuffe.ovh

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Topic starter Posted : 05/08/2011 12:37 am
Brian Cuff
(@briancuff)
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Hi Frank
This set uses the same chassis as the TS48 and I scrapped one of these a few months ago (I only had the chassis and that was very rusty). This means that I have some spares including a complete IF strip, so if you find that you need a coil or similar, please let me know.

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Posted : 05/08/2011 3:08 pm
FRANK.C
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Hi Brian.
Thanks for that most useful offer, I will take you up on it should the need arise.

Thanks again
Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 05/08/2011 5:23 pm
crustytv
(@crustytv)
Vrat Founder Admin

Hi Frank,

Lovely looking set, I look forward to your reports on its progress through restoration. I suspect you have service data as you mention a sheet but if not I can upload the Trader sheet to our library for you.

Chris

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Posted : 05/08/2011 7:12 pm
sideband
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Famed V-Ratter Moderator

All these wonderful TV's.......think I'll have to get one...or two........!

SB

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Posted : 05/08/2011 7:36 pm
Brian Cuff
(@briancuff)
Noble V-Ratter Rest in Peace

All these wonderful TV's.......think I'll have to get one...or two........!SB

or three...........or four.........! :D  😀

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Posted : 05/08/2011 8:13 pm
FRANK.C
(@frank-c)
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Hi Chris
I have Trader sheet 930/T3 if you have anything more it would most welcome.

Some of the circuitry is this set is quite different to what I've worked on before. The line output transformer has only a single primary and secondary winding, just like a field output transformer and the EHT is RF generated. It's interesting working on something unfamiliar.

Hi Rich
You know you'll have to. The only problem is there just as addictive as wirelesses.

Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 05/08/2011 9:11 pm
Brian Cuff
(@briancuff)
Noble V-Ratter Rest in Peace

Hi Frank
Spurred by your request for any service data other than the WET sheet, I have finished "processing" the manufacturer's service cards which I got off ebay some while ago. There are 6 pages of very useful gen with line drawings for layout etc. which are very clear. The average page size is about 3-4MB so the files are large. I can either send 4 emails or reduce the file sizes and send just one. Either way, I will need your email address ao please PM me with it. I will also send them to Jon E so that he can post them if he wants to.

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Posted : 06/08/2011 5:00 pm
FRANK.C
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Hi Brian
Thanks that's brilliant news. I'll need all the help I can get with this one.
PM sent

Thanks again for your trouble
Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 06/08/2011 7:08 pm
FRANK.C
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Hi Trevor
The chassis is quite clean with very little rust. I disassembled it today and got the feeling that the chassis was never out before or if it was it was a long time ago. I guess most work could be done on it with out removing the chassis. I will put up some more photos later on or tomorrow.

Yes that is your very famous Ambassador, I had her running only a couple of weeks ago and she was purring away quite happily. I had every intention of bringing her into the front room for last Christmas, but with the way the weather was it just didn't happen.

Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 06/08/2011 7:21 pm
FRANK.C
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Hi Brian
Thanks for the info, they are very good scans and they have allot more detail than the trader sheet. It will be very useful when I get as far as the electronics.

Thanks again
Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 07/08/2011 12:19 am
FRANK.C
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Some more photos
The first two shows how little the tube's neck protrudes out the back of the cabinet. You could almost get away without a dome.


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Next is the tube fitted into the assembly that holds it and the removed chassis.


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Then one that shows the construction of the castors. They are really well made, apart from a few chips missing from the wheels they are working perfectly and are very sturdy


Click to see full size image

Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 07/08/2011 12:59 am
crustytv
(@crustytv)
Vrat Founder Admin

Looks a marvellous chassis Frank, I take it that's mains derived EHT  😯

Chris

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Posted : 07/08/2011 1:06 am
FRANK.C
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Hi Chris
Fortunately it's not mains derived EHT.  
A separate oscillator running at 140 kHz is used to generate the EHT (I think it's referred to generally as RF generated EHT). The thick wires that can be seen wound around the top of the mains transformer are used to supply the heater of the EHT rectifier they may be at EHT potential. The EHT rectifier is indirectly heated but I don't see any cathode to heater voltage rating given in the data sheet.

Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 07/08/2011 1:44 am
FRANK.C
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Hi Trevor.
The setup is a bit precarious similar to the Bush TV24 arrangement. The clamp is located behind the focus coil. I have posted another photo, it may show it a bit better. There is always the fear that the tube will slide forward and pop onto the ground.

Frank


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Topic starter Posted : 07/08/2011 11:43 am
Brian Cuff
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The EHT rectifier is indirectly heated but I don't see any cathode to heater voltage rating given in the data sheet.Frank

I would say that the separate heater winding for the EHT rectifier ensures that the heater/cathode insulation is never stressed unless there is a short to chassis in the transformer. With the insulation provided on the winding, the EHT rectifier could be directly heated.

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Posted : 07/08/2011 5:38 pm
FRANK.C
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This project is proceeding slowly as expected but I have made some progress. I stripped the cabinet down to the bare wood. In the process it became clear that a lot of the original finish had flaked off or was otherwise removed. The cabinet is covered in mahogany veneer. I used stain to mimic the original shades as best I could, and finished it off by spraying with acrylic lacquer.
The surround for the implosion screen was covered with old stain, it took quite a bit of scrubbing to get it removed.
I still have to make side and back panels for it.

I have started on the chassis as well.
I started with the EHT generator as it could be tested independently of everything else. The two visconol cap's were leaky so I mounted two modern cap's on a piece of perspex in there place. There was only two other capacitors in the circuit. A silver mica which I left alone and I replaced the waxie. The one resistor in the circuit was way out of tolerance and was replaced. While testing the generator I replaced the U22 with a EHT diode. I isolated the HT to the circuit and also the heater supply to the P61 and hooked them up to a external supply. At 280V HT I was getting 6 kV across the EHT cap's which at least proves the generator is OK.

I have started recapping the chassis as well I will update as I progress

Frank

www.electronics.frankcuffe.ovh

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Topic starter Posted : 18/10/2011 10:34 pm
Anonymous
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Looking good. :thumbl:

- Joe

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Posted : 18/10/2011 10:58 pm
neil1974
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The cabinet does look very good now Frank. cheers neil.

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Posted : 19/10/2011 12:09 am
IJK2008
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Hello Frank

Very nice job on the cabinet so far. I must try the full strip back to the wood on a set some day.

Looking forward to the next instalment of the story.

Ian

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Posted : 19/10/2011 2:17 pm
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