What is the optimum output power of this pairs???

Leolabs · 7th December 2006, 01:10 AM

They are the old 2SA1302/2SC3281,planning to run them at 4 ohms load too

djk · 7th December 2006, 01:51 AM

One pair?

~70W at 4 ohms.

halo0925 · 7th December 2006, 02:08 AM

These are "classic transistor" and are pretty robust, Pioneer used them in alot of there amps with +/- 75VDC rails. I had a VSX 9300s 125WPC that used these babys.

Jan Dupont · 7th December 2006, 04:51 PM

These are nice transistors, but keep them within the SOA

AndrewT · 8th December 2006, 09:03 AM

Hi,
you can get one pair of 302/281 to run from +-39Vdc supply rails into an 8ohm load, giving about 55W to 60W into 8r.
For a 4ohm load the supply rails should be kept down to +-33Vdc and can give about 60W to 65W into 4r. But the 4ohm speaker should be of a moderate rather than severe load type.

7th December 2006, 01:10 AM	#1
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	What is the optimum output power of this pairs??? They are the old 2SA1302/2SC3281,planning to run them at 4 ohms load too

7th December 2006, 04:51 PM	#4
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	These are nice transistors, but keep them within the SOA __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

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7th December 2006, 01:51 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	One pair? ~70W at 4 ohms.

7th December 2006, 02:08 AM	#3
halo0925 diyAudio Member Join Date: Aug 2006	These are "classic transistor" and are pretty robust, Pioneer used them in alot of there amps with +/- 75VDC rails. I had a VSX 9300s 125WPC that used these babys.

8th December 2006, 09:03 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, you can get one pair of 302/281 to run from +-39Vdc supply rails into an 8ohm load, giving about 55W to 60W into 8r. For a 4ohm load the supply rails should be kept down to +-33Vdc and can give about 60W to 65W into 4r. But the 4ohm speaker should be of a moderate rather than severe load type.