Musical Fidelity transistors SM8605 SM8610

Stavrolus · 8th December 2011, 02:21 PM

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

Zen Mod · 8th December 2011, 05:51 PM

I'm not familiar with these , in A1

which position they have

sch from A class amplifier site

tiefbassuebertr · 8th December 2011, 06:16 PM

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

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

jaycee · 8th December 2011, 06:23 PM

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?

tiefbassuebertr · 08:45 PM

Quote:

Originally Posted by jaycee

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

Stavrolus · 8th December 2011, 09:16 PM

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.
__________________
Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com

Zen Mod · 8th December 2011, 09:26 PM

so

now you have both the info and schematic

dungdochi1978 · 22nd December 2011, 01:24 AM

Quote:

Originally Posted by Zen Mod

I'm not familiar with these , in A1

which position they have

sch from A class amplifier site

It is wrong type of transitor , why they sent wrong circuit ..
is it can working if make like circuit

dungdochi1978 · 22nd December 2011, 01:44 AM

Quote:

Originally Posted by dungdochi1978

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

8th December 2011, 02:21 PM	#1
Stavrolus diyAudio Member Join Date: Dec 2011	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

8th December 2011, 05:51 PM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	I'm not familiar with these , in A1 which position they have sch from A class amplifier site __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

8th December 2011, 09:26 PM	#7
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	so now you have both the info and schematic __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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8th December 2011, 06:23 PM	#4
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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?

8th December 2011, 09:16 PM	#6
Stavrolus diyAudio Member Join Date: Dec 2011	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. __________________ Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com

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