Anyone know a NEC K821 Replacement? - diyAudio
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Old 10th May 2007, 05:46 PM   #1
KyferEz is offline KyferEz  United States
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Question Anyone know a NEC K821 Replacement?

Working on a Mobile Authority 120ZX. It has 4 of the NEC K812 for the power supply that need replacement.

I checked NEC and they say it's obsolete. Suggestions?

Thanks
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Old 10th May 2007, 06:14 PM   #2
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Hi,

Try 2SK1296 or 2SK1291 - if they are available there.

Cheers,
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Old 10th May 2007, 06:33 PM   #3
KyferEz is offline KyferEz  United States
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Thanks. Mcminone has the 2SK1296. Off on another ordering spree
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Old 10th May 2007, 06:45 PM   #4
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Checked in my other substitute pocketbook and that says 2SK1296 too
So I'm sure that will works!

Regards,
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Old 5th June 2007, 05:58 PM   #5
KyferEz is offline KyferEz  United States
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Back to working on this amp; I just got in the parts.

It's working now, but the 2 right channels are not as loud as the 2 left channels. Why would this be?

Thanks
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Old 5th June 2007, 07:57 PM   #6
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Is the bias of OP devices readjusted yet?
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Old 5th June 2007, 11:38 PM   #7
KyferEz is offline KyferEz  United States
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I'm sorta new to this, so some more explanation is needed... Are you talking about the pots in each channel of the outputs?

If so, how do I properly adjust them? I've attached an image so you can see the output stage of this amp.

P.S. In case it's needed for this, I do have a good scope...

Click the image to open in full size.
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Old 7th June 2007, 07:32 PM   #8
KyferEz is offline KyferEz  United States
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Anyone?
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