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C-50 adjustments

Dr. Ear

Dr. Ear

Super Member
I got my C-50 today. The cabinet looks like new. Of course, I'm going perform the usual procedure, i.e. clean, recap and resolder it. There are some variable resistors which probably need some adjustment. Unfortunately I don't have the service manual. Does anybody have the schematics and/or the SM for the C-50 or, at least, for the rather similar C-70 or one can explain the adjustments to me? The C-50 seems to be a rare species.
 
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Thanks, I got a copy at manuals.com (paysite). Besides the usual
DC offset in the phono stage there are two other sections in the flat amp where I had to adjust DC balance, nothing else. I replaced all electrolytics and resoldered very many cracked solder joints. Strange, I discovered one 5 W resistor in the MC headamp which was connected with one leg only.
At the moment I have hooked it on to my M-4 listening to "Jazz at the pawnshop" (Thorens 320/TP90/AT33PTG) and I am very pleased of what I hear. Compared to the C-4 the 50 sounds warmer with more bass and a smooth, almost tube like treble. The NS-2000 is very critical regarding the front end, this seems to be a good match. Maybe also worth to mention, I used mostly ELNA Cerafine and Nichicon FG and a few Silmic II capacitors. Probably this contributes a little bit to the good sound.
I need a C-70 now. Immediately.
 
PM sent on a C-70

Dr. Ear said:
Thanks, I got a copy at manuals.com (paysite). Besides the usual
DC offset in the phono stage there are two other sections in the flat amp where I had to adjust DC balance, nothing else. I replaced all electrolytics and resoldered very many cracked solder joints. Strange, I discovered one 5 W resistor in the MC headamp which was connected with one leg only.
At the moment I have hooked it on to my M-4 listening to "Jazz at the pawnshop" (Thorens 320/TP90/AT33PTG) and I am very pleased of what I hear. Compared to the C-4 the 50 sounds warmer with more bass and a smooth, almost tube like treble. The NS-2000 is very critical regarding the front end, this seems to be a good match. Maybe also worth to mention, I used mostly ELNA Cerafine and Nichicon FG and a few Silmic II capacitors. Probably this contributes a little bit to the good sound.
I need a C-70 now. Immediately.
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sending you a PM on a C-70 for sale
 
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