Musical Fidelity transistors SM8605 SM8610

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tiefbassuebertr

tiefbassuebertr

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Joined 2005
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Stavrolus said:
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
Click to expand...
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
http://www.diyaudio.com/forums/solid-state/158554-musical-fidelity-a1-bias.html
http://www.diyaudio.com/forums/soli...ical-fidelity-a1-any-one-has-experiences.html
http://www.diyaudio.com/forums/soli...ction-class-b-switch-musical-fidelity-a1.html
http://www.diyaudio.com/forums/soli...l-fidelity-a1-integrated-repair-upgrages.html
http://www.diyaudio.com/forums/solid-state/162942-update-musical-fidelity-a1.html
http://www.diyaudio.com/forums/solid-state/147963-excellent-musical-fidelity-amplifier.html
http://www.diyaudio.com/forums/solid-state/137461-musical-fidelity-a1-improvements.html

There are much more threads here on diyaudio concerning A1
 
tiefbassuebertr

tiefbassuebertr

Member
Joined 2005
tiefbassuebertragung.de
jaycee said:
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?
Click to expand...
This means an other P-170 version ?? - go to post #59 about
http://www.diyaudio.com/forums/solid-state/59808-musical-fidelity-p170-power-amp-6.html
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:
S

Stavrolus

Member
Joined 2011
Thanks a lot to all of you. I have already an answer on an other post...

Quote:
Originally Posted by Stavrolus http://www.diyaudio.com/forums/soli...ity-p170-blown-transistors-3.html#post2811577
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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Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com
 
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