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Mikewong 30th January 2009 11:36 AM

Nak 610 Control Preamplifier needs help!
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Just got one of this from ebay but with power supply problem.
The normal regulated voltages are +10v and -10v and I got +4.45v & -7.10v.
It plays but with distorsion as you increase the input signal.
As from the service manual the AC supply voltages is 2X AC 9.8 volts but mine has 2X AC 13.8 voltes!
Both of the output transistors 2SD235 & 2SB435 are OK.

Where should I look for problems and to get it right again?

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