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Last product to have the Ekco brand name.  

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peterscott
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Posted by: @nuvistor

@peterscott
I thought the T1084 was the earlier version of the 11U chassis with the PCF80 second I.f and only one present contrast. The later versions of the 11U had a frame grid EF184 second IF and prest contrast controls for 405 and 625, they gave a decent account of themselves.

Hi Frank,

I couldn't have told you from memory but I still have T1084 / Ekco T407 service info. The first IF is EF183 and the second IF is 6F23 which doesn't have as high a gm as the EF184.

Peter

www.nostalgiatech.co.uk

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Posted : 03/08/2020 4:18 pm
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Nuvistor
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@peterscott

Obviously my memory is not that great. 🙂 

Frank

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Posted : 03/08/2020 5:11 pm
peterscott
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@nuvistor

It was T407 and not T398. Perhaps that explains the difference. I don't see separate contrast pre-sets on the T407 diagram.

www.nostalgiatech.co.uk

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Posted : 03/08/2020 5:31 pm
Nuvistor
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@peterscott
The T418 was the first with the  Pye 11u chassis with one preset and PCF80 second IF, the T433 was a later version of basically the same chassis with the EF184 second IF and two presets, I think from memory again which I probably shouldn’t do, that the later chassis had stabilised line output, VDR in the feedback circuit.

The T398 and T407 were probably the last designs from Ekco, I don’t know if the 11U was all Pye or a collaboration.

 

 

Frank

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Posted : 03/08/2020 8:19 pm
Till Eulenspiegel
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Strangely, the first Ekco dual standard TV doesn't appear in the 1962/63 R & T book but does so in the 63/64 book.  However, many sets fitted with the later dual standard chassis can be found in the 62/63 book.  Early production T402 models with equipped with the T398 chassis and the later models have the chassis fitted in the T407. The later DS models have very high gain valves in the tuner, Mazda 30L17 and 30C17.  This tuner was so good that Pye fitted it in many models including the model 11U.  Notice that in the later Ekco dual standard models European valves were beginning to replace many of the unique to Mazda types, for example DY86 replaces U26. 

Till Eulenspiegel.

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Posted : 03/08/2020 8:34 pm
peterscott
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I'm not sure if this will be clear enough. There is a VDR in the brightness control.

P1030110 (Medium)

www.nostalgiatech.co.uk

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Posted : 03/08/2020 8:38 pm
Till Eulenspiegel
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Hi Peter,  the VDR at the bottom end of the brightness control.  At the time of  switching off the receiver the VDR serves to discharge the EHT rapidly by increasing the CRT beam current. Prevents spot burn on the screen.

Till Eulenspiegel.

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Posted : 03/08/2020 8:58 pm
peterscott
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@till

Thanks Till, That makes very good sense to me, for as long as I've owned the HMV901 I've acted as its VDR. 😉 Well, perhaps not quite the same. I just turn the brighness to minimum before switch-off.

Peter 

www.nostalgiatech.co.uk

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Posted : 03/08/2020 9:54 pm
Till Eulenspiegel
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Showing the internals of the Ekco T398. 

Ekco T398 rear
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Posted : 04/08/2020 9:44 pm
Nuvistor
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@till

Very much based on the 405 only T381 series.

Not sure why but I saw few of the T381 to T407 chassis sets. Many earlier models and many of the T418 and later. We were a small shop and had the Bush agency and saw I many TV105 sets and later, perhaps the owner concentrated selling those models at that time. I was employed there from early 1965 so that was before I worked there. Happy days at that shop, sadly the owner died many years ago and the fellow engineer/salesman died around 6 years ago.

 

Frank

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Posted : 05/08/2020 7:19 am
Till Eulenspiegel
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Made for export the Ekco A725 radio.

Ekco A704

Apart from the EZ80 HT rectifier all the other valves have been replaced. The EZ80 has the date code B9A = January 1959 Blackburn works, so it's safe to say the set was made in 1959. The receiver has full medium waveband coverage and three short wavebands, no long waveband. 

The coil pack

Ekco A704 coil pack

Rear view. It's possible a home market version of this set was made.

Ekco A704 rear

Till Eulespiegel

 

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Posted : 08/08/2020 11:51 am
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