Musical Fidelity P270

Lenin · 22nd March 2002, 08:12 PM

This sublime sounding, 45kg (100lb), hot running Tim DeParavicini designed delight has been gathering dust on my equipment shelf for a year and a half now, (having started smouldering one evening) while other audio projects have taken prominence.

I'm now ready to leap in, scope and soldering iron all fired up, but unfortunately, I don't have a schematic. Anyone out there able to help me out?

Thanks in advance.

Lenin · 23rd March 2002, 11:34 PM

Or maybe the Musical Fidelity A370 (its the same amp with 2 extra pairs of mosfets) or any 80's vintage big MF for that matter. (A470, etc, etc...)

Thanks in advance.

efren sabio · 13th August 2004, 11:10 AM

Hi,

I just fixed a MF A220, class-a amp and the chassis really gets
hot; yours might have the same circuit. I sketched the circuit,
which I always try to do when I'm fixing an amp, and I was
surprised to find out that the A220 is a clone of the 1977 Hitachi
100w amp but instead of the Hitachi 2sk135/J49 the A220 uses
the Buz900/905 mosfets, 2 pairs in all with PSU of +-42volts.
In fact, this 1977 design had been one of Maplin's popular
diy amp.
You'll get the schematic easily. I don't know yet how to send
diagrams through the web!

Lenin · 13th August 2004, 01:12 PM

Thanks Efren

Got the schematic now.

mwaters10 · 21st November 2004, 09:55 PM

Would it be possible for you to e-mail the schemtic to me also.
I've just replaced a faulty BC414 NPN, but in doing so, I snapped off one of the 7 polypropolene caps and can't repair it.
It's the caps with "Specially made for Musical Fidelity" on. I can't see what the value is, other than SC3261uK 250Vac. If you know this value, then I would be very grateful for any information that you have.
Thanks

Greeny · 12th August 2005, 10:52 AM

Hi,

Does anybody out there have a copy of the Musical Fidelity P270 Mk 1 power amplifier.

It is starting to smoke a little near to the heat sink on the rh channel.

I am willing to pay for one.

Many thanks.

Paul.

Licence · 10th November 2009, 01:39 AM

I'm also interested in the schematics for the P270 mkI?

Thanks, much appreciated!

cln.white · 13th January 2010, 07:01 PM

In responce to your queery regardings caps, SC326 is probaby man type No. 1McF 250Volts. Is it large yellow cap?

dangthanhtung · 5th February 2010, 07:39 AM

Hello!

Recently I bough this "Musical Fidelity P270-2 Reference" power amp, but I haven't find any info about it:
Google Dịch

Please help me to know some technical specs or experiences of using this rare pow. I'm also interested in the schematics for the P270 mkI.
Thank you very much!

dangthanhtung · 5th February 2010, 02:44 PM

...only some infos on back side photo:

22nd March 2002, 08:12 PM	#1
Lenin diyAudio Member Join Date: Feb 2002 Location: London	Musical Fidelity P270 This sublime sounding, 45kg (100lb), hot running Tim DeParavicini designed delight has been gathering dust on my equipment shelf for a year and a half now, (having started smouldering one evening) while other audio projects have taken prominence. I'm now ready to leap in, scope and soldering iron all fired up, but unfortunately, I don't have a schematic. Anyone out there able to help me out? Thanks in advance.

23rd March 2002, 11:34 PM	#2
Lenin diyAudio Member Join Date: Feb 2002 Location: London	No P270 schematics then? Well how about... Or maybe the Musical Fidelity A370 (its the same amp with 2 extra pairs of mosfets) or any 80's vintage big MF for that matter. (A470, etc, etc...) Thanks in advance.

12th August 2005, 10:52 AM	#6
Greeny diyAudio Member Join Date: Aug 2005	musical Fidelity P270 schematic. Hi, Does anybody out there have a copy of the Musical Fidelity P270 Mk 1 power amplifier. It is starting to smoke a little near to the heat sink on the rh channel. I am willing to pay for one. Many thanks. Paul.

5th February 2010, 07:39 AM	#9
dangthanhtung diyAudio Member Join Date: Nov 2009 Location: Hanoi, Vietnam	Musical Fidelity P270-2 Reference! Hello! Recently I bough this "Musical Fidelity P270-2 Reference" power amp, but I haven't find any info about it: Google Dịch Please help me to know some technical specs or experiences of using this rare pow. I'm also interested in the schematics for the P270 mkI. Thank you very much!

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13th August 2004, 11:10 AM	#3
efren sabio diyAudio Member Join Date: Aug 2003 Location: hongkong	Hi, I just fixed a MF A220, class-a amp and the chassis really gets hot; yours might have the same circuit. I sketched the circuit, which I always try to do when I'm fixing an amp, and I was surprised to find out that the A220 is a clone of the 1977 Hitachi 100w amp but instead of the Hitachi 2sk135/J49 the A220 uses the Buz900/905 mosfets, 2 pairs in all with PSU of +-42volts. In fact, this 1977 design had been one of Maplin's popular diy amp. You'll get the schematic easily. I don't know yet how to send diagrams through the web!

13th August 2004, 01:12 PM	#4
Lenin diyAudio Member Join Date: Feb 2002 Location: London	Thanks Efren Got the schematic now.

21st November 2004, 09:55 PM	#5
mwaters10 diyAudio Member Join Date: Nov 2004 Location: UK	Would it be possible for you to e-mail the schemtic to me also. I've just replaced a faulty BC414 NPN, but in doing so, I snapped off one of the 7 polypropolene caps and can't repair it. It's the caps with "Specially made for Musical Fidelity" on. I can't see what the value is, other than SC3261uK 250Vac. If you know this value, then I would be very grateful for any information that you have. Thanks

10th November 2009, 01:39 AM	#7
Licence diyAudio Member Join Date: Oct 2009	I'm also interested in the schematics for the P270 mkI? Thanks, much appreciated!

13th January 2010, 07:01 PM	#8
cln.white diyAudio Member Join Date: Jan 2006 Location: Scottish Borders	In responce to your queery regardings caps, SC326 is probaby man type No. 1McF 250Volts. Is it large yellow cap?

5th February 2010, 02:44 PM	#10
dangthanhtung diyAudio Member Join Date: Nov 2009 Location: Hanoi, Vietnam	...only some infos on back side photo:

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