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Old 7th Apr 2019, 2:32 am   #1
mustangjohn
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Smile Sinclair MTV1 micro B&W TV's.

good morning all from sunny Queensland, Australia,, on my work bench I have 2 Sinclair micro B&W TV's model MTV1 both suffered from corrosion due to batteries being left in over a long period of time, the mess has cleaned up and new batteries fitted, now I find that the power IC designated number ST3 is faulty in both, I have not been able to locate this IC anywhere, nothing in reference books or on the internet, local semi-conductor suppliers have never heard of it, I suspect it is Sinclair's in house manufacture, can anyone suggest a NOS supplier or a replacement IC, many thanks John.
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Old 10th Apr 2019, 3:48 am   #2
mustangjohn
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Default Re: Sinclair MTV1 micro B&W TV's.

More information the IC's were made by Texas Instruments, and the TV's were actually manufactured by Wolsey Electronics a Welsh company for Sinclair, no takers yet, still looking for ST3 01 03 power IC's
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Old 10th Apr 2019, 8:37 am   #3
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Default Re: Sinclair MTV1 micro B&W TV's.

Wolsey used to make TV aerials
and aerial amplifiers.
I'm sure people in the UK remember the
Wolsey "Colour King" stacked
bowtie UHF aerial.
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Old 10th Apr 2019, 9:46 am   #4
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Default Re: Sinclair MTV1 micro B&W TV's.

We used to sell the Aerial amps at Rumbelows when I worked there , I remember them because all the engineers used to take them to boost poor signals when the rental customers used to complain, and I was for ever re ordering from central stock 20 at a time.
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Old 10th Apr 2019, 10:21 am   #5
Cobaltblue
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Default Re: Sinclair MTV1 micro B&W TV's.

Hi John

Is this a sixteen pin IC?

Radio Museum has circuits etc with hand written notes about IC types.

https://www.radiomuseum.org/r/sinclair_mtv1mtv.html

Some are difficult to read though.

Unless your a member you can only download 3 pages a day

The page with the Line Frame and power is gb_sinclair_mtv1a_sch11.pdf

Cheers

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Old 10th Apr 2019, 12:30 pm   #6
AC/HL
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Default Re: Sinclair MTV1 micro B&W TV's.

That manual is here: https://www.vintage-radio.net/forum/...ad.php?t=54239
It doesn't help John sourcing a chip though. May be a case of cannibalising an otherwise scrap one, although they aren't common.
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Old 10th Apr 2019, 12:53 pm   #7
SiriusHardware
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Default Re: Sinclair MTV1 micro B&W TV's.

Just be sure it is the chip in both cases - I have one of these (working) and had to re-capacitor it about ten years ago as many of the original capacitors had dried up - no visible leakage or distortion, they just weren't doing their job any more.
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Old 10th Apr 2019, 1:17 pm   #8
Richard_FM
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Default Re: Sinclair MTV1 micro B&W TV's.

I heard some of the MTV1 chips were custom made by Ferranti, Timex supplied the CRT, Polaroid the battery packs & final assembly was by Thorn EMI at Enfield.
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Old 10th Apr 2019, 1:36 pm   #9
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Default Re: Sinclair MTV1 micro B&W TV's.

Quote:
Originally Posted by Richard_FM View Post
I heard some of the MTV1 chips were custom made by Ferranti, Timex supplied the CRT, Polaroid the battery packs & final assembly was by Thorn EMI at Enfield.
I used to cannibalise old Polaroid Instant camera used film packs for the flat battery inside to use in my Sinclair pocket TV .
Saved me a fortune .
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