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KyferEz 10th May 2007 05:46 PM

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?


sixtek 10th May 2007 06:14 PM


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


KyferEz 10th May 2007 06:33 PM

Thanks. Mcminone has the 2SK1296. Off on another ordering spree :D

sixtek 10th May 2007 06:45 PM

Checked in my other substitute pocketbook and that says 2SK1296 too ;)
So I'm sure that will works!


KyferEz 5th June 2007 05:58 PM

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?


sixtek 5th June 2007 07:57 PM

Is the bias of OP devices readjusted yet?

KyferEz 5th June 2007 11:38 PM

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...

KyferEz 7th June 2007 07:32 PM


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