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Thorn 1500 VT10 type TVT 7

 
Focus Diode
(@focus)
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Anyone know a suitable replacement for the above? The Radio & TV Servicing info gives suitable replacement types for all diodes and transistors bar this one. It's used as the flywheel DC amp and is a NPN type.

Cheers,
Brian

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Topic starter Posted : 08/06/2016 1:12 pm
crustytv
(@crustytv)
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Posts: 10843

Easy, TVT7 was Thorns internal component Id naming system, the transistor in question was a BC117. Quite why Thorn did this alternative naming is beyond me, it just introduced another layer of unnecessary complexity.

Anyway that's history, if you don't have any BC117 you can use a BF257 or a BF297

Edit: I'm working on a page for the main website that will help folk decode all Thorns internal Id's for components. I'll extend the scope of the document to include earlier B&W chassis.
https://www.radios-tv.co.uk/brcthorn-component-guide/

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Posted : 08/06/2016 1:29 pm
Till Eulenspiegel
(@till)
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The BC117 is a high voltage transistor, a suggested replacement is the BF178.
Hi Brian, if you are needing a BC117 I might have one somewhere.

Till Eulenspiegel.

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Posted : 08/06/2016 1:45 pm
Focus Diode
(@focus)
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That's brilliant, many thanks to you both!
Cheers
Brian

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Topic starter Posted : 08/06/2016 2:03 pm
Cathovisor
(@cathovisor)
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Easy, TVT7 was Thorns internal component Id naming system, the transistor in question was a BC117. Quite why Thorn did this alternative naming is beyond me, it just introduced another layer of unnecessary complexity.

The idea was that any transistor designated as 'TVT7' by Thorn could be fitted in this position, regardless of the actual type number or manufacturer. The idea was it made it simpler for the dealer - you just said "I'd like 10 TVT7s, please" and you'd get whatever was the flavour of the month - or was available - with Thorn.

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Posted : 08/06/2016 6:23 pm
crustytv
(@crustytv)
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Posts: 10843

you've solved a puzzle for me, I have a little filing cabinet full of Thorn components which are all in envelopes. At the top of the envelope is the Thorn code, some have card inserts. Now I know why under the code the packets contain so many different types.

I was finding it very confusing whilst trying to document the codes when some transistors/diodes were turning up all over the place.
:ccb

Thank You :thumb

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Posted : 08/06/2016 6:42 pm
Cathovisor
(@cathovisor)
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De rien :qq1

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Posted : 08/06/2016 6:49 pm