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Old 8th Jan 2019, 5:51 pm   #1
recordplayer
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Default Transistors for Clarke and Smith CS1 record player

Hi.

Does anyone have any MP8112 and MP8512 transistors - 2 of each if possible. These are small flat type transistors used in a Clarke and Smith record player for the output transistors. The MP 8112 is the culprit it reads leaky/faulty.
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Old 9th Jan 2019, 8:03 pm   #2
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Default Transistors for Clarke and Smith record player by

Hi , regarding an earlier post of mine - please see pictures of the MP 8112 and MP 8512 output transistors that I need for this Clarke and Smith CS 1 record player - they are the unusual black transistors mounted on the heatsink at top of pic , thanks Tony .
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Old 9th Jan 2019, 8:38 pm   #3
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Default Re: Transistors for Clarke and Smith CS1 record player

Available from Cricklewoods

https://www.cricklewoodelectronics.com/MP8112.html
https://www.cricklewoodelectronics.com/MP8512.html
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Old 9th Jan 2019, 8:41 pm   #4
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Default Re: Transistors for Clarke and Smith CS1 record player

Thanks Bill.
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Old 10th Jan 2019, 12:02 pm   #5
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Default Re: Transistors for Clarke and Smith CS1 record player

Looks like the heatsink's drilled for TO3. You could just use something considerably beefier and easier to source than those 'orrible things I remember from Sinclair stuff.

The amp could end up bomb proof, too.
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Old 10th Jan 2019, 3:18 pm   #6
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Default Re: Transistors for Clarke and Smith CS1 record player

Motorola's car radio design department had a love affair with those in the '70s.
I changed loads of them. They seemed to be very unreliable.
Herald's suggestion is eminently sensible - plenty of tougher TO3 types (if that heatsink is drilled for TO3s) available at a fraction of the cost. Tony
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Old 10th Jan 2019, 3:52 pm   #7
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Default Re: Transistors for Clarke and Smith CS1 record player

Couldn't you just bung in a BD139/BD140 pair?
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Old 10th Jan 2019, 4:31 pm   #8
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Default Re: Transistors for Clarke and Smith CS1 record player

If the originals are germanium, I can't help wondering if the AD161/162 pair would fit. A bit smaller than TO3, but seems a bit more likely given current practice at the time.
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Old 10th Jan 2019, 4:37 pm   #9
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Default Re: Transistors for Clarke and Smith CS1 record player

They are silicon.
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Old 10th Jan 2019, 5:00 pm   #10
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Default Re: Transistors for Clarke and Smith CS1 record player

Yes, I've just found them in Towers. An actual paper copy

Prior to that, I'd only found anything MP**** in an old TVT book, and all of those listed were germanium. Looking at the machine, it does look contemporaneous with things like the Bush SRP51, for example, but then this is Clarke and Smith - looks can be deceptive!
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Old 10th Jan 2019, 7:46 pm   #11
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Default Re: Transistors for Clarke and Smith CS1 record player

If the heat sink is indeed drilled for TO-66, modern TO-220 replacements will fit perfectly (with the right insulator of course). If it's drilled for TO-3, you can use TO-3P or TO-247 transistors.
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Old 10th Jan 2019, 9:04 pm   #12
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Default Re: Transistors for Clarke and Smith CS1 record player

Or just replace the single failed transistor and keep it original. It's not a common or repeat fault. If that doesn't work, perhaps then go down the modification route.
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Old 11th Jan 2019, 12:48 am   #13
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Default Re: Transistors for Clarke and Smith CS1 record player

The TO-66 2N3054 was quite common, and RS made a matching PNP3054. I doubt
whether these would be easily destroyed.
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Old 11th Jan 2019, 8:52 pm   #14
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Default Re: Transistors for Clarke and Smith CS1 record player

Got the original transistors from Cricklewood Electronics - fitted them plus changed four electrolytics which where out of spec and speaker needed replacing - it was slightly grating - it was rescued for a rubbish tip !! It sounds great now and is really well made - will give it a good soak test and service the Garrard deck - lovely well made player .
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Old 12th Jan 2019, 12:04 am   #15
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Default Re: Transistors for Clarke and Smith CS1 record player

Oh THOSE things. They earned me plenty of pocket money when I was a lad, replacing them in record players and stereo's of the time. Ultra/BRC I think used them.
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