Musical Fidelity P270

[Lenin]

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]

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.

 

[efren sabio]

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]

Thanks Efren

Got the schematic now.

 

[mwaters10]

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]

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.

 

[Licence]

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

Thanks, much appreciated!

 

[cln.white]

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

 

[dangthanhtung]

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!

 

[dangthanhtung]

...only some infos on back side photo:

 

[Bobisify]

270-2 Schematic

Do you guys still have the 270-2 schm? It could really help me in fixing my device. Thanks in advance & cheers. hameedhem@gmail.com (Work Email)

 

[Ian Finch]

You will not find formally drafted schematics or service manuals for MF products. It's amazing what a little searching will find though: http://www.diyaudio.com/forums/solid-state/138621-musical-fidelity-p270-2-output-devices-4.html

 

[Bobisify]

You're a diamond, Thank You!

 

[Tarasque]

Be carefull...yours has 3 output devices (p270) the schematic has 5 devices (P370)
watch for the dissipation when you populate all 5!!!

 

[Taasing]

I the anybody out there, which have the service manual for the P270 ?
I can't find it anywhere.


Kind Regards
Michael

 

[Ian Finch]

Did you read the previous 5 posts? There won't be service manual because MF don't publish them for general distribution.