Musical Fidelity B1 Schematic (does anyone have one?) - diyAudio
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Old 9th August 2008, 05:37 PM   #1
Thomo is offline Thomo  United Kingdom
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Default 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.
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Old 9th August 2008, 11:50 PM   #2
mikee55 is offline mikee55  United Kingdom
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Default a possible link

http://www.georgeforeman.co.uk/?utm_...eman%20grill:D
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Old 10th August 2008, 12:13 AM   #3
mikee55 is offline mikee55  United Kingdom
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Default 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
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Old 10th August 2008, 07:31 AM   #4
Thomo is offline Thomo  United Kingdom
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Default Re: a possible link

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

Mmmm, tasty bit of kit. Thanks, lol.

Lee.
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Old 10th August 2008, 07:36 AM   #5
Thomo is offline Thomo  United Kingdom
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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.
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Old 7th October 2008, 02:07 PM   #6
Niggle is offline Niggle  Wales
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Default 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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Old 7th October 2008, 03:19 PM   #7
Thomo is offline Thomo  United Kingdom
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I did finally manage to get the schematics yes.

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

Cheers, Lee.
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Old 7th October 2008, 04:16 PM   #8
Niggle is offline Niggle  Wales
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Default 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
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Old 7th October 2008, 04:34 PM   #9
Thomo is offline Thomo  United Kingdom
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Sorry it took so long, but I finally found it.

You can download the files here

Cheers, Lee.
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Old 8th October 2008, 07:43 PM   #10
Niggle is offline Niggle  Wales
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Default B1 Schematics

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

Cheers

Nigel
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