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Old 8th November 2012, 11:34 AM   #1
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Unhappy Musical Fidelity A100 resistors

I bought recently A100 which is very bad condition,and am trying to repair power supply circuit. I found out R1 & R2 were faulty and their color code fadeout.

Dose anyone know resistance of R1 and R2 ? I put each 0.47ohm resistor as the same as A1. Now plus minus voltage over 41-volt against
plus minus 24-volt. Input AC100V after through transformer dropped about AC32V. I surely did mistake. Please help.

Is A100 Transformer 2ndary AC32V correct ?

Thank you

Last edited by yossy993; 10th November 2012 at 12:00 AM. Reason: Transformer
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Old 29th November 2012, 07:15 PM   #2
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0.47 ohm
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Old 30th November 2012, 03:40 PM   #3
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Read these pages if you haven't already. The details you want are there. The A1 & A100 are very similar.
Musical Fidelity A1
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regards
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Old 9th January 2013, 11:17 AM   #4
Adq is offline Adq  Italy
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Quote:
Originally Posted by yossy993 View Post
I bought recently A100 which is very bad condition,and am trying to repair power supply circuit. I found out R1 & R2 were faulty and their color code fadeout.

Dose anyone know resistance of R1 and R2 ? I put each 0.47ohm resistor as the same as A1. Now plus minus voltage over 41-volt against
plus minus 24-volt. Input AC100V after through transformer dropped about AC32V. I surely did mistake. Please help.

Is A100 Transformer 2ndary AC32V correct ?

Thank you
Hi yossy993, on my A100 the value of R1 and R2 is 0.33 ohm , the power transformers AC output is 30-0-30 without load , the DC voltage when circuit running drop at 32-0-32 ( instead of being next to 42 V)
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