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Old 8th December 2011, 02:21 PM   #1
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Default Musical Fidelity transistors SM8605 SM8610

Hello,
I have an old Musical Fidelity A1 and I have to replace transistors SM8610 and SM8605. Does anybody know what I can take instead ?
Thank you very much,
Stavrolus
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Old 8th December 2011, 05:51 PM   #2
Zen Mod is offline Zen Mod  Serbia
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I'm not familiar with these , in A1

which position they have

sch from A class amplifier site


Click the image to open in full size.
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Old 8th December 2011, 06:16 PM   #3
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Quote:
Originally Posted by Stavrolus View Post
Hello,
I have an old Musical Fidelity A1 and I have to replace transistors SM8610 and SM8605. Does anybody know what I can take instead ?
Thank you very much,
Stavrolus
perhaps this URLs help:
Musical Fidelity A1 - Technical
Musical Fidelity A1 - Freie Ton- und Bildwerkstatt
DIYPlus • ???? - MUSICAL FIDELITY A1 S

concerning the SM series (SM8610-SM8605 from Semelab for Musical Fidelity) call there:
Magnatec. Power System Semiconductors

check also out this
Musical Fidelity A1 bias
Circuit of Musical Fidelity A1, Any one has experiences?
Loudspeaker protection and “class A/B switch” in Musical Fidelity A1
Musical Fidelity A1 Integrated repair/upgrages
Update Musical Fidelity A1
Excellent Musical Fidelity amplifier
Musical Fidelity A1 Improvements

There are much more threads here on diyaudio concerning A1
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Old 8th December 2011, 06:23 PM   #4
jaycee is offline jaycee  United Kingdom
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It could be that this is an A1 Final, which according to Mark Hennessy, is really a B200 with an opamp input stage driving lateral MOSFET outputs. In that case they used BUZ900/905 MOSFETs. What does the PCB say near the outputs?
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Old 8th December 2011, 08:40 PM   #5
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Quote:
Originally Posted by jaycee View Post
It could be that this is an A1 Final, which according to Mark Hennessy, is really a B200 with an opamp input stage driving lateral MOSFET outputs. In that case they used BUZ900/905 MOSFETs. What does the PCB say near the outputs?
This means an other P-170 version ?? - go to post #59 about
Musical Fidelity P170 Power Amp
obviously yes - go to
http://www.mhennessy1.f9.co.uk/mf_a1/others.htm#final
SML-Logo on the there showed BUZ900 means Semelab - I think.
BTW - in my last post there is a high resolution pdf schematic (own drawing) of the P170

Last edited by tiefbassuebertr; 8th December 2011 at 08:45 PM.
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Old 8th December 2011, 09:16 PM   #6
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Thanks a lot to all of you. I have already an answer on an other post...

Quote:
Originally Posted by Stavrolus
Hello,
I have an old Musical Fidelity A1 and I have to replace transistors SM8610 and SM8605. Does anybody know what I can take instead ?
Thank you very much,
Stavrolus


Those are probably the date codes not the type number
Originals are actually 2N3055 and MJ2955 marked as A1N and A1p
MJ15003 and MJ15004 can be used as an improvement.
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Old 8th December 2011, 09:26 PM   #7
Zen Mod is offline Zen Mod  Serbia
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so

now you have both the info and schematic

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Old 22nd December 2011, 01:24 AM   #8
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Quote:
Originally Posted by Zen Mod View Post
I'm not familiar with these , in A1

which position they have

sch from A class amplifier site


Click the image to open in full size.
It is wrong type of transitor , why they sent wrong circuit ..
is it can working if make like circuit
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Old 22nd December 2011, 01:44 AM   #9
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Quote:
Originally Posted by dungdochi1978 View Post
It is wrong type of transitor , why they sent wrong circuit ..
is it can working if make like circuit
may be Q5,6,7,8 need change
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