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Audio and Video Talk
The Vintage Audio Section
NAD 3125 service manual
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<blockquote data-quote="Rick" data-source="post: 749568" data-attributes="member: 17143"><p>Where is the fault pre or power?</p><p></p><p>Can you post a larger pic of the resistors? I suspect from what I can see on the less charred ends see they very well may be 330 Ohm 5% (Some older NAD amp designs of this generation I repair always seem to have blown 33/330 Ohm near the pre drivers of the power sections).</p><p></p><p>On a side note its unusual for just that 2SC1815 transistor to fail all by itself without any other subsequent damage besides two resistors, usually (and depending on where it is), the short takes out several subsequent stages when they are turned full on after it shorts. If its in the power amp section, better to be safe and use a multimeter diode test to check the PN junction forward voltage drop on any related transistors that have been fed signal by the blown one.</p></blockquote><p></p>
[QUOTE="Rick, post: 749568, member: 17143"] Where is the fault pre or power? Can you post a larger pic of the resistors? I suspect from what I can see on the less charred ends see they very well may be 330 Ohm 5% (Some older NAD amp designs of this generation I repair always seem to have blown 33/330 Ohm near the pre drivers of the power sections). On a side note its unusual for just that 2SC1815 transistor to fail all by itself without any other subsequent damage besides two resistors, usually (and depending on where it is), the short takes out several subsequent stages when they are turned full on after it shorts. If its in the power amp section, better to be safe and use a multimeter diode test to check the PN junction forward voltage drop on any related transistors that have been fed signal by the blown one. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
NAD 3125 service manual
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