Musical Fidelity B1 Schematic (does anyone have one?)

Thomo · 9th August 2008, 05:37 PM

I have just modded this great little amp, but would really love the schematic if anyone has one please?

I am particularly interested in the pre-amp section, if anyone knows of another MF amp that has the same preamp section, that'd be great.

Regards,

Lee.

mikee55 · 9th August 2008, 11:50 PM

http://www.georgeforeman.co.uk/?utm_...eman%20grill:D

mikee55 · 10th August 2008, 12:13 AM

http://www.fletchersite.com/

There are sites, some like this one

http://www.user-service-manuals.com/

http://hifi-wiki.com/index.php/Product_Database(maybe)

Sorry bout the grill pan, reminded me of the A1

Mike

Thomo · 10th August 2008, 07:31 AM

Quote:

Originally posted by mikee55
http://www.georgeforeman.co.uk/?utm_...eman%20grill:D

Mmmm, tasty bit of kit. Thanks, lol.

Lee.

Thomo · 10th August 2008, 07:36 AM

In all seriousness though, I am very impressed with this B1 amp. The sound is very open and clean and with great bass control.

I just managed to squeeze some Mundorf smoothing caps in there, which made a nice difference, I also changed the preamp section opamp to LM4562, which really improved the detail.

Cheers for the links,

Lee.

Niggle · 7th October 2008, 02:07 PM

Hi Thomo

Did you manage to locate the schematics you were looking for?
The reason I ask is my B1 went 'belly up' at the weekend; I replaced the fuse at the back of the unit, it powered up, but no output.

I whipped the top off to find resistor R69 and one of the main electrolytic caps were touching and the resistor totally scorched - I am certain the resistor is open circuit, but no sure about the state of the cap - its marked and the plastic coating has partly flaked off but it looks OK.

Anyway, the resistor is too badly damaged to figure out it's rating, so I am trying to find a schematic to find out, once I have relpaced it I should be able to figure out the status of the cap.

I have tried following the links provided by Mikee55, but without any success.

Any help would be appreciated - cheers.

Thomo · 7th October 2008, 03:19 PM

I did finally manage to get the schematics yes.

I will upload them to my site and post links soon.

Cheers, Lee.

Niggle · 7th October 2008, 04:16 PM

Good news; I have scoured he internet and found nothing of any use.

I look forward to your link - if the schematic is readily accessible, can you advise the rating of R69?

Many thanksfor the help.

Cheers

Nigel

Thomo · 7th October 2008, 04:34 PM

Sorry it took so long, but I finally found it.

You can download the files here

Cheers, Lee.

Niggle · 8th October 2008, 07:43 PM

Excellent, just what I need - many thanks, very much appreciated.

Cheers

Nigel

9th August 2008, 05:37 PM	#1
Thomo diyAudio Member Join Date: Nov 2006	Musical Fidelity B1 Schematic (does anyone have one?) I have just modded this great little amp, but would really love the schematic if anyone has one please? I am particularly interested in the pre-amp section, if anyone knows of another MF amp that has the same preamp section, that'd be great. Regards, Lee. __________________ /\/\/\/\/\/\/\/

9th August 2008, 11:50 PM	#2
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	a possible link http://www.georgeforeman.co.uk/?utm_...eman%20grill:D __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

10th August 2008, 12:13 AM	#3
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	another, on a serious note. http://www.fletchersite.com/ There are sites, some like this one http://www.user-service-manuals.com/ http://hifi-wiki.com/index.php/Product_Database(maybe) Sorry bout the grill pan, reminded me of the A1 Mike __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

10th August 2008, 07:36 AM	#5
Thomo diyAudio Member Join Date: Nov 2006	In all seriousness though, I am very impressed with this B1 amp. The sound is very open and clean and with great bass control. I just managed to squeeze some Mundorf smoothing caps in there, which made a nice difference, I also changed the preamp section opamp to LM4562, which really improved the detail. Cheers for the links, Lee. __________________ /\/\/\/\/\/\/\/

7th October 2008, 02:07 PM	#6
Niggle diyAudio Member Join Date: Oct 2008	B1 Scematic? Hi Thomo Did you manage to locate the schematics you were looking for? The reason I ask is my B1 went 'belly up' at the weekend; I replaced the fuse at the back of the unit, it powered up, but no output. I whipped the top off to find resistor R69 and one of the main electrolytic caps were touching and the resistor totally scorched - I am certain the resistor is open circuit, but no sure about the state of the cap - its marked and the plastic coating has partly flaked off but it looks OK. Anyway, the resistor is too badly damaged to figure out it's rating, so I am trying to find a schematic to find out, once I have relpaced it I should be able to figure out the status of the cap. I have tried following the links provided by Mikee55, but without any success. Any help would be appreciated - cheers.


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7th October 2008, 03:19 PM	#7
Thomo diyAudio Member Join Date: Nov 2006	I did finally manage to get the schematics yes. I will upload them to my site and post links soon. Cheers, Lee. __________________ /\/\/\/\/\/\/\/

7th October 2008, 04:16 PM	#8
Niggle diyAudio Member Join Date: Oct 2008	B1 Schematics Good news; I have scoured he internet and found nothing of any use. I look forward to your link - if the schematic is readily accessible, can you advise the rating of R69? Many thanksfor the help. Cheers Nigel

7th October 2008, 04:34 PM	#9
Thomo diyAudio Member Join Date: Nov 2006	Sorry it took so long, but I finally found it. You can download the files here Cheers, Lee. __________________ /\/\/\/\/\/\/\/

8th October 2008, 07:43 PM	#10
Niggle diyAudio Member Join Date: Oct 2008	B1 Schematics Excellent, just what I need - many thanks, very much appreciated. Cheers Nigel

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