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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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4th Apr 2020, 9:35 am | #1 |
Nonode
Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
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Micro Alloy Transistors?
In another thread there is a link to a copy of Practical Wireless from December 1963. In the advertisement pages, there is a double-pager from Sinclair offering several of his little goodies and there’s a reference to M.A.T. Micro-Alloy Transistors which are claimed to offer “Extremely high power gain at all levels of collector current and voltages, and at frequencies from a.f. To 100 mc/s”
I wondered what these were about?
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4th Apr 2020, 9:47 am | #2 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,510
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Re: Micro Alloy Transistors?
If you put 'Micro Alloy Transistors' into Google, a lot of information comes up, including a previous thread on here!
Andy |
4th Apr 2020, 9:47 am | #3 |
Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,958
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Re: Micro Alloy Transistors?
I seem to remember that Micro Alloy Transistors were offered by Philco and may have been developed by that firm. They were gold coloured devices. I can across them in a transistor radio tuner with FM I repaired. I think it was one of those GEC sets with unusual rounded ends.
I've found it - the GEC BC562. Ron Last edited by ronbryan; 4th Apr 2020 at 10:00 am. |
4th Apr 2020, 9:48 am | #4 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
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Re: Micro Alloy Transistors?
Yes good old Clive
http://www.wylie.org.uk/technology/s...ics/Semics.htm There is a persisting belief that Clives MAT transistors were just remarked Plessey out of spec devices. Cheers Mike T
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4th Apr 2020, 1:30 pm | #5 |
Hexode
Join Date: Oct 2014
Location: Wiltshire, UK.
Posts: 378
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Re: Micro Alloy Transistors?
Is it a false memory or do I remember either Practical Wireless or Radio Constructor giving a free MAT device with the magazine? I think the supporting article was some kind of headphone amplifier that could be powered with just 1.5Volt.
Roger |
4th Apr 2020, 2:12 pm | #6 |
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Re: Micro Alloy Transistors?
MAT121 I seem to remember.
I've always believed that all of Clive's transistors were drop outs from somewhere or another, Plessey and Ferranti I thought. Maybe these are real ones? If so, it must be rather annoying. They say burglars are most upset by being banged-up for the one they didn't commit. David
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4th Apr 2020, 2:41 pm | #7 |
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Location: Oxford, UK
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Re: Micro Alloy Transistors?
Didn't Plessey make them under licence from Philco for a time?
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4th Apr 2020, 3:00 pm | #8 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
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Re: Micro Alloy Transistors?
Yes they did if you follow the link in #4 it explains the situation The Mister Transistor web site is well worth a visit excellent stuff on early semiconductors.
Cheers Mike T
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
6th Apr 2020, 10:14 pm | #9 |
Octode
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
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Re: Micro Alloy Transistors?
When I was a youth in Sheffield there must have been a PW article requiring a MAT101 transistor, which I duly purchased from Bardwells. Probably 1964-5. Here it is! I recall whatever it was I built never worked, and looking at the curves it's not surprising!
John (0.5mA/div vert, 1V/div hor. 5uA base step size.) |