9011402-E Transistor - UK Vintage Radio Repair and Restoration Discussion Forum

Stylo N M · 18th Oct 2015, 3:01 am

Hi.

I'm struggling to find any information on this transistor, can someone tell me if there is an equivalent and what the number is and is there a UK
stockist?

I have no home computer, and can only work on my mobile so I'm a bit stuck to say the least.

Thank you, Paul.

AC/HL · 18th Oct 2015, 11:54 am

It looks like an in-house number. What is it out of, and what does it do?

Stylo N M · 18th Oct 2015, 12:51 pm

Hi bill,

Thank you for the reply, it's in the linear motor circuit i think of that rechid green mettoy 1978 music master stereo battery operated record player, it's got four of them of that number and one other one of a different number, plus the two audio ic's and two zener diodes.

Thats all of the semiconductors on the intire circuit board, the speed is all over the place it keeps slowing and then it's ok for a while, i know the motor is set right beacuse it's been fine for weeks i've used it every night, and i recapped it four years ago or more, so i'm thinking it can only be an intermitent transistor what would you suggest? (hope this hasen't gone off topic) just a bit annoyed with all the hard work i've put into it.
paul.

paulsherwin · 18th Oct 2015, 1:29 pm

If there are 4 of them then it's highly likely that they are general purpose Si NPN types. If you remove one you should be able to work out the connections.

Radio Wrangler · 18th Oct 2015, 2:23 pm

Ah the Mettoy direct drive thingie.

If you want to know the provenance:

http://zstereo.co.uk/2013/11/07/strathearn-sma2/

David

Stylo N M · 18th Oct 2015, 4:31 pm

Hi.

Thank you Paul, thanks Dave, dare I ask do you have any idea wich general purpose NPN transistor might be suitable for this type of application? I can always try one at a time whilst there's still life in it, and then check to see if it's any better or any worse as I go along.

Paul.

Radio Wrangler · 18th Oct 2015, 6:15 pm

A quick look at the supply voltage will give a clue to what voltage rating of device is a good bet. Mettoy means battery powered, i suppose.

2N3904 is a cheap as chips and has many makers, does 40v 300mA 300mW.
2N3906 is the PNP complement. There are other popular GP devices, but these are common all round the world.

One thing to watch out for was that Ferranti which became Zetex and now is part of Diodes inc. makes a number of small transistors with surprising current power and gain ratings. THey can be hard to find alternatives for.

David

paulsherwin · 18th Oct 2015, 8:05 pm

I suggest you try whatever you have to hand in the BC108/BC548 class. I don't think these will be high current devices but if you suspect this you could try an output transistor like a BC327.

The classic 2N2222 would also be worth a punt if you have any in stock.

Any scrap equipment from the 70s will be full of general purpose transistors of some type. Early VCRs contain 30 or 40 of them.

Stylo N M · 18th Oct 2015, 8:18 pm

Hi,

Thank you dave, i shall have a go will order some bits tomorrow, theres nothing to loose really as when it's in this mood it isen't playable anyway at least i have a torch now in the gloom.

paul.

julie_m · 18th Oct 2015, 9:04 pm

Could you borrow another, non-faulty transistor off the board just long enough to test it for polarity and gain? Then try substituting with BC547 (if NPN; BC557 if PNP) if it has a gain over 100, or BC327 (if NPN; BC337 if PNP) if less -- or if the BC5x7 just overheats.

Stylo N M · 18th Oct 2015, 10:05 pm

Hi
thanks again paul, thanks julie yes i could try that, i had a bag of BC108 and a lot of other transistors but haven't been able to find them for some time it's a puzzle where they all went.

Yes i've just discovered the 2N2222 along with some BC serries so i will give it a go.
Thank you,

paul.

Radio Wrangler · 18th Oct 2015, 11:36 pm

If you need the PNP complement to 2N2222, it's 2N2907.

David

Maarten · 19th Oct 2015, 11:37 pm

I haven't seen this mentioned, so just for reference: 9011 is a common medium and low frequency Hong-Kong type and 402 may be just a date code. Equivalents for the 9011 include BC547 and BF254, except for possibly different pinout.

Stylo N M · 22nd Oct 2015, 8:48 pm

Hi,

thank you for that maarten, do you know that's really strange somewhere in the far distant past, that seems familiar regarding that transistor code it's as if i've heard that quoted before. Yes the BC237 seems to work quite happily, thank you also for the equivalent numbers.

Thank you radio wrangler for the information you have posted, that has helped i will get a few more of these general purpose transistors there always handy.

Thanks again to paul, i can conclude that in the end no replacement transistors were required, but thanks to this forum i've learnt a lot more about it.

paul.

18th Oct 2015, 3:01 am	#1
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	9011402-E Transistor Hi. I'm struggling to find any information on this transistor, can someone tell me if there is an equivalent and what the number is and is there a UK stockist? I have no home computer, and can only work on my mobile so I'm a bit stuck to say the least. Thank you, Paul.

18th Oct 2015, 11:54 am	#2
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: 9011402-E Transistor It looks like an in-house number. What is it out of, and what does it do?

18th Oct 2015, 12:51 pm	#3
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: 9011402-E Transistor Hi bill, Thank you for the reply, it's in the linear motor circuit i think of that rechid green mettoy 1978 music master stereo battery operated record player, it's got four of them of that number and one other one of a different number, plus the two audio ic's and two zener diodes. Thats all of the semiconductors on the intire circuit board, the speed is all over the place it keeps slowing and then it's ok for a while, i know the motor is set right beacuse it's been fine for weeks i've used it every night, and i recapped it four years ago or more, so i'm thinking it can only be an intermitent transistor what would you suggest? (hope this hasen't gone off topic) just a bit annoyed with all the hard work i've put into it. paul.

18th Oct 2015, 1:29 pm	#4
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: 9011402-E Transistor If there are 4 of them then it's highly likely that they are general purpose Si NPN types. If you remove one you should be able to work out the connections.

18th Oct 2015, 2:23 pm	#5
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,876	Re: 9011402-E Transistor Ah the Mettoy direct drive thingie. If you want to know the provenance: http://zstereo.co.uk/2013/11/07/strathearn-sma2/ David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

18th Oct 2015, 4:31 pm	#6
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: 9011402-E Transistor Hi. Thank you Paul, thanks Dave, dare I ask do you have any idea wich general purpose NPN transistor might be suitable for this type of application? I can always try one at a time whilst there's still life in it, and then check to see if it's any better or any worse as I go along. Paul.

18th Oct 2015, 6:15 pm	#7
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,876	Re: 9011402-E Transistor A quick look at the supply voltage will give a clue to what voltage rating of device is a good bet. Mettoy means battery powered, i suppose. 2N3904 is a cheap as chips and has many makers, does 40v 300mA 300mW. 2N3906 is the PNP complement. There are other popular GP devices, but these are common all round the world. One thing to watch out for was that Ferranti which became Zetex and now is part of Diodes inc. makes a number of small transistors with surprising current power and gain ratings. THey can be hard to find alternatives for. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

18th Oct 2015, 8:05 pm	#8
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: 9011402-E Transistor I suggest you try whatever you have to hand in the BC108/BC548 class. I don't think these will be high current devices but if you suspect this you could try an output transistor like a BC327. The classic 2N2222 would also be worth a punt if you have any in stock. Any scrap equipment from the 70s will be full of general purpose transistors of some type. Early VCRs contain 30 or 40 of them.

18th Oct 2015, 8:18 pm	#9
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: 9011402-E Transistor Hi, Thank you dave, i shall have a go will order some bits tomorrow, theres nothing to loose really as when it's in this mood it isen't playable anyway at least i have a torch now in the gloom. paul.

18th Oct 2015, 9:04 pm	#10
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: 9011402-E Transistor Could you borrow another, non-faulty transistor off the board just long enough to test it for polarity and gain? Then try substituting with BC547 (if NPN; BC557 if PNP) if it has a gain over 100, or BC327 (if NPN; BC337 if PNP) if less -- or if the BC5x7 just overheats. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

18th Oct 2015, 10:05 pm	#11
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: 9011402-E Transistor Hi thanks again paul, thanks julie yes i could try that, i had a bag of BC108 and a lot of other transistors but haven't been able to find them for some time it's a puzzle where they all went. Yes i've just discovered the 2N2222 along with some BC serries so i will give it a go. Thank you, paul.

18th Oct 2015, 11:36 pm	#12
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,876	Re: 9011402-E Transistor If you need the PNP complement to 2N2222, it's 2N2907. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

19th Oct 2015, 11:37 pm	#13
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,199	Re: 9011402-E Transistor I haven't seen this mentioned, so just for reference: 9011 is a common medium and low frequency Hong-Kong type and 402 may be just a date code. Equivalents for the 9011 include BC547 and BF254, except for possibly different pinout.

22nd Oct 2015, 8:48 pm	#14
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: 9011402-E Transistor Hi, thank you for that maarten, do you know that's really strange somewhere in the far distant past, that seems familiar regarding that transistor code it's as if i've heard that quoted before. Yes the BC237 seems to work quite happily, thank you also for the equivalent numbers. Thank you radio wrangler for the information you have posted, that has helped i will get a few more of these general purpose transistors there always handy. Thanks again to paul, i can conclude that in the end no replacement transistors were required, but thanks to this forum i've learnt a lot more about it. paul.