Schematic for SK9446/9447

Jim Karr · 6th February 2010, 12:11 AM

Is it possible that anyone can help provide me with a simple schematic to use some specific output transistors I've obtained?

I have the heatsinks and outputs from someone's scrap pile that have two pairs of SK9446 and SK9447 output transistors. Crosses for these are NTE or ECG92 and 93. 9446 are NPN, 9447 are PNP.

I have searched all over the 'net for a datasheet that shows an application circuit design, but no luck.

Anyone able to help me?

thanks! Jim

h_a · 6th February 2010, 07:43 AM

If you already know that these are bipolars, you can build whatever bipolar amp meets your liking. No need to use one that uses exactly these parts.

Just make sure somehow that voltage ratings are not exceeded, in other terms, if there's no datasheet or you're not able to find out the amp your parts were in, build a small amp (30W or so) to be on the safe side.

Have fun, Hannes

talonix · 6th February 2010, 01:16 PM

SK was the replacement line for RCA - you won't find an application note - just specs from their cross reference guides. Somewhere along the way, somebody replaced the OEM parts with the SK9446 and 9447. Let me get to work, and I'll post the specs from the RCA SK replacement guide, circa 1992.

Cheers,

6th February 2010, 12:11 AM	#1
Jim Karr diyAudio Member Join Date: May 2004 Location: Southwest Michigan	Schematic for SK9446/9447 Is it possible that anyone can help provide me with a simple schematic to use some specific output transistors I've obtained? I have the heatsinks and outputs from someone's scrap pile that have two pairs of SK9446 and SK9447 output transistors. Crosses for these are NTE or ECG92 and 93. 9446 are NPN, 9447 are PNP. I have searched all over the 'net for a datasheet that shows an application circuit design, but no luck. Anyone able to help me? thanks! Jim __________________ As for me and my household, we shall serve the Lord. Joshua

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6th February 2010, 07:43 AM	#2
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	If you already know that these are bipolars, you can build whatever bipolar amp meets your liking. No need to use one that uses exactly these parts. Just make sure somehow that voltage ratings are not exceeded, in other terms, if there's no datasheet or you're not able to find out the amp your parts were in, build a small amp (30W or so) to be on the safe side. Have fun, Hannes

6th February 2010, 01:16 PM	#3
talonix diyAudio Member Join Date: Oct 2006	SK was the replacement line for RCA - you won't find an application note - just specs from their cross reference guides. Somewhere along the way, somebody replaced the OEM parts with the SK9446 and 9447. Let me get to work, and I'll post the specs from the RCA SK replacement guide, circa 1992. Cheers,