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Forum 135

Great big TV sets with tiny screens.

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Till Eulenspiegel
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This is the kind of set I like. It's got a huge cabinet but the screen is very small. The example of the species shown in the attachments is the Ekco TSC30 of 1946. This set is essentially a pre-war model and was designated as the TSC902 in 1939.

My set is actually the TSC30/1 which has two extra valves, a Mazda D1 single diode which functions a white spot clipper. The other is a Mazda DD41 double-diode and is employed as a sound interference limiter. The circuit is called a "Dickert limiter" would you believe. It's a clever system as it tracks the maximum amplitude of the waveform and any spikes above that level are clipped.

There is an explanation in one of the Spreadbury books on how it works. This set has the biggest frame output valve ever, a Mazda PEN46 which was designed as a line output valve. All this to scan a nine inch 57 degree CRT operating at 5KV. It is a Mazda CRM92.

Till Eulenspiegel.

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Posted : 29/05/2013 12:12 pm
malcscott
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Hi David, that is a very nice looking set you have there. Does it work? Malc.

 
Posted : 29/05/2013 12:50 pm
Till Eulenspiegel
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Hi Malc,

It works quite well although the CRT is a bit low. The set is actually one of my rebuilt wrecks. i bought it in 1998 and although the chassis was OK the cabinet had been cut in half, the bottom part was missing. I considered the set well worth saving and a new cabinet was made using parts of the top section.

The TSC30 is a rare set so all I had to work from was photographs in books and such like. The pictures show the remains of the cabinet before reconstruction. I was very lucky with this one as there was still a few reference lines in existence to work from.

I think the set was subject of a topic on the other Forum a few years ago. The pictures are of very poor quality as a Polaroid camera used used in poor lighting conditions. didn't have a digital camera in 1998.

Till Eulenspiegel.

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Posted : 29/05/2013 1:05 pm
IJK2008
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Hello Till

Would you count the RGD 2371 in this category?

It is engineered like a battleship.

I know you have one and it is cracking looking set - the kind of thing I could probably get away with having in the living room!

Cheers

Ian

 
Posted : 29/05/2013 1:12 pm
Till Eulenspiegel
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Hi Brian,
Maybe not built on such a grand style of the RGD but nevertheless the Ekco is built like a tank. The chassis is mighty heavy. I'll take some pictures of it later. Unfortunately I've some beautiful LCD TVs to look at right now. It might come as a surprise I'd rather work on the EKco.

Till Eulenspiegel.

 
Posted : 29/05/2013 1:21 pm
peterscott
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I think the Americans have us beat in this category...

Peter 

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www.nostalgiatech.co.uk

 
Posted : 29/05/2013 3:55 pm
Till Eulenspiegel
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How about this one, a mirror lid five inch CRT set from Andrea.

Till Eulenspiegel.

 
Posted : 29/05/2013 4:06 pm
Panrock
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I know it's cheating slightly but I think Baird probably won the cabinet to screen size ratio with some of his mechanical sets.

.... you mean, something like this? 

Forum 145

Steve

 
Posted : 29/05/2013 6:31 pm
Panrock
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This perhaps?

http://www.nationalmediamuseum.org.uk/C ... d=1937-666

 
Posted : 29/05/2013 6:42 pm
Till Eulenspiegel
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Wasn't there a tall cabinet mech set (made by Bush?) with a tiny screen?

The Baird Bush 30 line mirror drum receiver. The example displayed must be the only one in existence.

Till Eulenspiegel.

 
Posted : 29/05/2013 7:13 pm
Brian Cuff
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Member Rest in Peace
 

Have you read the description of the Marconi AXBT ribbon mic under "Studio equipment" on that website? Don't believe everything you read on the web!

Forum Memorial

 
Posted : 29/05/2013 9:20 pm
linesync
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Hi David

That ekco TSC30 is a beautiful set and what a nice job you made of restoring the cabinet. I,ve never seen that model before and for a long time thought the TS46 was ekco,s first post war tv. I,ve looked at the service manule for this model this evening and the chassis looks similar to the pre war TA201 , am i right or am i just imagining it?

Yes i agree a small c.r.t in a big cabinet does look good , i like the two big american sets too.

Robin

 
Posted : 29/05/2013 10:57 pm
Till Eulenspiegel
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Hi Robin,

The chassis TSC30 is similar in appearance to the one in the TA201 but there are a number of differences. For example the timebase output valves are an AC6/PEN for line and a PEN45 for frame.. In the TSC30 two PEN46 beam tetrodes are used. I'd imagine that the pre-war TSC902 is almost identical to the TSC30. Other pre-war models: TS701 and TS901 are also similar but are table sets. The TSC30 does not have a frame output transformer, instead high impeadance scan coils are employed. The anode load of the frame output valve is a 5.6Kohm resistor.

All these sets are TRF receivers and SP41 HF pentodes are employed, in fact all the valves are 4volt types.
The pre-war sets employ two five pin UU5 HT rectifiers. The post-war TSC30 employs two Mazda Octal UU7s.
All these models TA201 thru to TSC30 employ T41 thyratrons as the timebase oscillators, so does the TS46.
Pictures of the TSC902 and the TSC30 seem to indicate that there are cut-outs on the sides of the cabinet, they could be similar to those on the TSC48 mirror lid set. As I am not certain what the dimensions are so I'll leave my cabinet without those vents for the time being.

Till Eulenspiegel.

 
Posted : 29/05/2013 11:25 pm
Till Eulenspiegel
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Two pictures of the TSC30 chassis, as you can see everything is built on a grand scale. Note the three mains transformers, vision, EHT and sound.

Till Eulenspiegel.

 
Posted : 30/05/2013 12:01 am
linesync
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Hi David
Thanks for the pictures of the chassis , i bet thats heavy .
Yes really well made and i like the dog bone type resistors and the cream control knobs on the back of the chassis.
The c.r.t looks quite bright as well .

Robin

 
Posted : 30/05/2013 10:22 pm
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