Musical Fidelity B1 - Bias and DC settings?

Salar · 4th May 2008, 10:30 AM

Hello,
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 FET´s are 2N3055.
All the best,
Salar

AndrewT · 4th May 2008, 11:13 AM

has your B1 been repaired?

Salar · 4th May 2008, 12:33 PM

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

4th May 2008, 10:30 AM	#1
Salar diyAudio Member Join Date: Feb 2006 Location: Berlin	Musical Fidelity B1 - Bias and DC settings? Hello, 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 FET´s are 2N3055. All the best, Salar

4th May 2008, 11:13 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	has your B1 been repaired? __________________ regards Andrew T.

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4th May 2008, 12:33 PM	#3
Salar diyAudio Member Join Date: Feb 2006 Location: Berlin	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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