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Old 6th May 2012, 07:28 AM   #1
yd1cvj is offline yd1cvj  Indonesia
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Default C1583 & A798

Hi, I am looking for preamp with transistor C1583 & A798 . Please share in this forum .TQ
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Old 8th March 2014, 04:17 AM   #2
yd1cvj is offline yd1cvj  Indonesia
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Does any body have diagram for tone control with C1583 and A789 ?
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Old 8th March 2014, 04:05 PM   #3
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Well, how many do you have? If in doubt you could always sell them since people have already been going to the trouble of making DIY replacements (by hand-matching transistors) for these rather hard-to-find parts. In case of the 2SC1583, apparently even fakes have surfaced.

These dual transistors were typically used as the input differential pair in opamp-type circuits (usually power amps or more rarely, phonopres).

Since they are complementary, one could make a dual differential input opamp (akin to this circuit but for smaller powers and unity gain stable) and use it in an inverting Baxandall tone control. Though honestly, I'd rather use it for the output amplifier and entrust the tone control to a plain ol' NE5532.
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