Musical Fidelity B1 - Bias and DC settings? - diyAudio
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Old 4th May 2008, 10:30 AM   #1
Salar is offline Salar  Germany
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Join Date: Feb 2006
Location: Germany
Default Musical Fidelity B1 - Bias and DC settings?

does anyone know the settings for the bias and dc of the Musical Fidelity B1?
Which setting I will have to adjust first, and will be a voltmeter sufficient? (A scope is also available)
The FETīs are 2N3055.
All the best,
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Old 4th May 2008, 11:13 AM   #2
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
has your B1 been repaired?
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 4th May 2008, 12:33 PM   #3
Salar is offline Salar  Germany
diyAudio Member
Join Date: Feb 2006
Location: Germany
By myself,
swapped the power transistors and electrplytics last year.
I own it now for 18 years.
Until then, the B1 was faulty, had a distorted noise on the right channel after being powered up during the first minutes.
This was repaired about 10 years ago but the problem reoccured.
I always let the amp switched on but after the amp finally blew last year I decided to do it myself.
It now runs without problems but i want to be sure, that the levels for bias and dc are correct. I also have sometimes the feeling of hearing a slight distortion, crackling, i.e when listening to trumpets or dynamic material. But I could not hear any distortion when playing testtones like pulses or sawtooths.
All the best, Salar
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