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Replacement transistors for Spectrum +2 (grey)

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  Replacement transistors for Spectrum +2 (grey) Alex <alexhopson@gmail.com> - 2016-09-04 14:48 -0700
    Re: Replacement transistors for Spectrum +2 (grey) AndyW <Andy@nojunqmail.com> - 2016-09-05 07:44 +0100
      Re: Replacement transistors for Spectrum +2 (grey) Alex <alexhopson@gmail.com> - 2016-09-05 11:01 -0700
        Re: Replacement transistors for Spectrum +2 (grey) AndyW <Andy@nojunqmail.com> - 2016-09-06 07:15 +0100
    Re: Replacement transistors for Spectrum +2 (grey) Volker Bartheld <news2016@bartheld.net> - 2016-09-06 08:47 +0200
    Re: Replacement transistors for Spectrum +2 (grey) "Brian Gaff" <briang1@blueyonder.co.uk> - 2016-09-09 07:35 +0100

#4238 — Replacement transistors for Spectrum +2 (grey)

Hi,

I'm trying to fix a Spectrum +2, I suspect the transistors may be at fault and am looking to order some replacements. It seems the original transistors aren't used any more so I'm trying to figure out what the modern equivalents are there's guides for 48ks but not +2s, this is what I have so far:

TR1,3,6 BC239B/C549B - can't figure out equivalent
TR2     BC308B/C558B - can't figure out equivalent
TR4,5,7 2N3904       - 2N3904 - same
TR9     ZTX650       - ZTX651
TR8     ZTX213       - BC557

I'd be grateful if someone could fill the blanks and confirm my suggestions are suitable replacements.

Thanks
Alex

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#4239

On 04/09/2016 22:48, Alex wrote:
> Hi,
>
> I'm trying to fix a Spectrum +2, I suspect the transistors may be at fault and am looking to order some replacements. It seems the original transistors aren't used any more so I'm trying to figure out what the modern equivalents are there's guides for 48ks but not +2s, this is what I have so far:
>
> TR1,3,6 BC239B/C549B - can't figure out equivalent
> TR2     BC308B/C558B - can't figure out equivalent

You can still buy BC239B 
<http://www.cricklewoodelectronics.com/BC239B.html?gclid=Cj0KEQjwjK--BRCzv-Wyu4OTosEBEiQAgFp5OMdxHBFKt6nS8HWEpSEljI3gzLOIWMsm6VNvSL6PbYYaAsdt8P8HAQ>
And BC308B in ebay.

Andy

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#4240

Even easier, thanks I was looking on cpc. Were the other replacements suitable?

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#4241

On 05/09/2016 19:01, Alex wrote:
> Even easier, thanks I was looking on cpc. Were the other replacements suitable?

Have you looked on Ebay for the originals? all the transistors are on 
sale there.

The other thing to look at is to test the transistors; many inexpensive 
multimeters have a transistor tester as standard.
What makes you think that it is the transistors to blame?
Generally on older technology the electrolytic capacitors drift with 
age, that would be one of my first things to look at.

Andy

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#4242

Hi!

On Sun, 4 Sep 2016 14:48:15 -0700 (PDT), Alex wrote:
> TR1,3,6 BC239B/C549B - can't figure out equivalent

https://www.buerklin.com/en/transistor/p/11s7000

> TR2     BC308B/C558B - can't figure out equivalent

https://www.buerklin.com/en/transistor/p/11s9750

> TR4,5,7 2N3904       - 2N3904 - same

https://www.buerklin.com/en/transistor/p/27s5200

> TR9     ZTX650       - ZTX651

http://de.farnell.com/diodes-inc/ztx651/transistor-npn-60v-2a-e-line/dp/9525572

> TR8     ZTX213       - BC557

http://de.farnell.com/diodes-inc/ztx751/transistor-bipolar-pnp-60v-2a/dp/9525629

At least that is what I get out of
http://www.8bit-wiki.de/index.php?id=3&filt=Sinclair/ZX_Spectrum/_zx48/manual/&cid=13597&mode=dl&tx=bd69aaf0000
and by comparing a few key features of those semiconductors.

HTH & Greets,
Volker

-- 
@:  W E B 2 0 1 6 at B A R T H E L D dot N E T
3W: www.bartheld.net

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#4243

In many cases, just first figure out whether they are pnp or npn and look at 
the disipation. In many cases general purpose transistors used to work well 
enough in many places, as I recall.

Obviously its been a long time and memories fad, but are you absolutely sure 
transistors have failed, and exactly why they failed if they indeed have. I 
know transistors are cheap but you really don't want to be fiddling about 
unless you are pretty sure the fault that caused them to fail is no longer 
present. Dodgy capacitors, etc. It is also a good idea to make sure the psu 
is the right one and not faulty. The plus 2 had a voltage regulator inside 
in a socket very  prone to dodgy connections.
 Brian

-- 
 -----  -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
briang1@blueyonder.co.uk
Blind user, so no pictures please!
"Alex" <alexhopson@gmail.com> wrote in message 
news:99550f6c-a9b1-42e3-a571-9c731c28dd95@googlegroups.com...
Hi,

I'm trying to fix a Spectrum +2, I suspect the transistors may be at fault 
and am looking to order some replacements. It seems the original transistors 
aren't used any more so I'm trying to figure out what the modern equivalents 
are there's guides for 48ks but not +2s, this is what I have so far:

TR1,3,6 BC239B/C549B - can't figure out equivalent
TR2     BC308B/C558B - can't figure out equivalent
TR4,5,7 2N3904       - 2N3904 - same
TR9     ZTX650       - ZTX651
TR8     ZTX213       - BC557

I'd be grateful if someone could fill the blanks and confirm my suggestions 
are suitable replacements.

Thanks
Alex 

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