Musical Fidelity A220 Schematics? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd February 2006, 03:54 PM   #1
ckng is offline ckng  Singapore
diyAudio Member
 
Join Date: Jan 2006
Location: Singapore
Default Musical Fidelity A220 Schematics?

Hi,

Does anyone has the schematics or service manual for the Musical Fidelity A220? I searched around here and in google but cannot seem to locate one. Thanks!

Regards
CK
  Reply With Quote
Old 27th February 2006, 11:00 AM   #2
diyAudio Member
 
Join Date: Dec 2003
Location: earth
hi try here, identical apart from output stage, which has more transistors

http://www.rspu.ryazan.ru/~foboss/pl...il.ru/mfa2.htm
  Reply With Quote
Old 27th February 2006, 01:32 PM   #3
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
Hmmm.... Negative rail at the top of the schematic to confuse, why can't people stick to drawing conventions.

The bias setting pot goes to maximum current if the wiper goes open too.
  Reply With Quote
Old 27th February 2006, 02:41 PM   #4
ckng is offline ckng  Singapore
diyAudio Member
 
Join Date: Jan 2006
Location: Singapore
Thanks. The page appears to have only the pre-amp section tho, the power section is not shown. I can't read russian but are they trying to bypass the op-amps for some reason?

I am also wondering (assuming the circuitry is similar, at least for the pre-amp stage) is it feasible to take the ouput from the op-amps (pin 1/7) after the 100ohm resistor and use it as a volume-controllable preamp output?

Regards
CK
  Reply With Quote
Old 27th February 2006, 03:19 PM   #5
dimitri is offline dimitri  United States
diyAudio Member
 
dimitri's Avatar
 
Join Date: Oct 2002
Location: retired
Send a message via ICQ to dimitri
Default the power section is not shown

reverse engineering:
http://www.rspu.ryazan.ru/~foboss/pl...2/MFA2MAIN.jpg

how it should be - from Paul Skritek
Handbuch der Audio-Schaltungstechnik
http://www.rspu.ryazan.ru/~foboss/pl...MFA2/AMPSK.jpg
  Reply With Quote
Old 19th April 2008, 03:08 AM   #6
diyAudio Member
 
Join Date: Apr 2008
Default Musical fidelity A220 repair scematic anybody please

Hi guys,

i have a wonderful A220 which just gave up in a puff of smoke. As i love this sweet sounding amp i would love to get it fixed again but for that i need a circuit diagram. Can anybody help please.
I already had a look at previous posts but the links are dead.

Thanks guys
T.ruppenthal
  Reply With Quote
Old 8th December 2009, 08:18 PM   #7
diyAudio Member
 
Join Date: Dec 2009
Default Schematics for the Musical Fidelity A220

Hi,

Does anyone has the schematics for the Musical Fidelity A220? I searched around here and in google but cannot seem to locate one. I am interested in the differences with the MF A2.

Regards
Hans
  Reply With Quote
Old 12th March 2011, 09:03 AM   #8
cpitts is offline cpitts  Australia
diyAudio Member
 
Join Date: Jan 2010
Location: Melbourne
*BACK FROM THE DEAD!!!!*

So to help people out, I'm doing a refresh/fix-up on my amp to make a really nice amp, a lot better. Won't divulge where I got this info, but here's a link to my site that's documenting my work (currently underway).

Doodads galore! We just luv em.

Have also completely rebuilt my speakers as well which is worth a read (jump to the link via the menu at the top ). And no, I'm not selling stuff, pushing product or anything, I'm just wanting to share as much of this as possible.
  Reply With Quote
Old 21st March 2011, 09:24 AM   #9
ckng is offline ckng  Singapore
diyAudio Member
 
Join Date: Jan 2006
Location: Singapore
Quote:
Originally Posted by cpitts View Post
*BACK FROM THE DEAD!!!!*

So to help people out, I'm doing a refresh/fix-up on my amp to make a really nice amp, a lot better. Won't divulge where I got this info, but here's a link to my site that's documenting my work (currently underway).

Doodads galore! We just luv em.

Have also completely rebuilt my speakers as well which is worth a read (jump to the link via the menu at the top ). And no, I'm not selling stuff, pushing product or anything, I'm just wanting to share as much of this as possible.
Wow, can't believe this thread was revived after 5 years! Thanks for all the information that you've put up.

However, sadly, my A220 literally went up in smoke a few days ago after an hour of playing + 1 hour idling after that. White smoke came out from the vents until I powered it off and unplugged everything.

Suspecting maybe a blown electrolytic cap I wanted to open up the case but it's secured with security Torx screws. The next day I searched high and low in the nearest hardware store for a suitable driver and had to buy the whole set as they don't sell singles.

Anyway, after it's open, I found nothing that appears to be obviously burnt. One of the 1W(?) resistors in the right power stage had some chipping. I am not about to plug this in again to see what is actually burning up though.

Any idea how I can troubleshoot this safely or will it be better to get a certified pro to check it out/repair it?

Thanks!

Regards
CK
  Reply With Quote
Old 21st March 2011, 09:36 AM   #10
ckng is offline ckng  Singapore
diyAudio Member
 
Join Date: Jan 2006
Location: Singapore
Quote:
Originally Posted by cpitts View Post
*BACK FROM THE DEAD!!!!*

So to help people out, I'm doing a refresh/fix-up on my amp to make a really nice amp, a lot better. Won't divulge where I got this info, but here's a link to my site that's documenting my work (currently underway).

Doodads galore! We just luv em.

Have also completely rebuilt my speakers as well which is worth a read (jump to the link via the menu at the top ). And no, I'm not selling stuff, pushing product or anything, I'm just wanting to share as much of this as possible.
And interestingly, your A220 has a pre-out, mine doesn't. Hmm...

Regards
CK
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Musical Fidelity x10d schematics here JDowland Digital Source 9 29th March 2013 05:02 AM
Looking for Musical FIdelity A3.2 CD Schematics PierreG Digital Source 3 11th December 2012 10:46 PM
Musical fidelity A2 schematics jmmartins Solid State 16 8th February 2010 11:25 PM
Musical Fidelity A3.2cr Schematics Alexandru Solid State 1 26th September 2008 12:40 AM
Musical Fidelity Schematics? Sampsa Solid State 1 22nd June 2006 01:59 PM


New To Site? Need Help?

All times are GMT. The time now is 06:41 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2