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Old 21st August 2008, 05:49 PM   #1
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Default Nad 1020b

Hello!
I need schematic(service manual) for NAD1020b preamplifier.
Couple of years ago I made a clone of this preamp.
I need original value of the resistors R903/904, in the original preamp I found resistors R903/904=33 ohm/1or 2w.
I also have some schematic of NAD 3020b and there the value of these resistors are 10 ohms?.
These resistors is on the P.s. before the transistors Q901=2SD669, and Q902=2SB649, also in some cases theese transistors are BD139/BD140.
What is the original resistance of R903/R904 in 1020b preamp???.
Why are the positive and negative voltages different values +is 29,9V, and -25,6V.?
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Old 23rd August 2008, 01:07 PM   #2
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I already found a schematic.
I don't need anything now
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