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Old 7th December 2006, 01:10 AM   #1
Leolabs is offline Leolabs  Malaysia
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Question What is the optimum output power of this pairs???

They are the old 2SA1302/2SC3281,planning to run them at 4 ohms load too
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Old 7th December 2006, 01:51 AM   #2
djk is offline djk
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One pair?

~70W at 4 ohms.
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Old 7th December 2006, 02:08 AM   #3
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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.
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Old 7th December 2006, 04:51 PM   #4
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These are nice transistors, but keep them within the SOA
Free Schematic and Service Manual downloads www.audio-circuit.dk, Spare time company (just for fun): www.dupont-audio.com
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Old 8th December 2006, 09:03 AM   #5
AndrewT is offline AndrewT  Scotland
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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.
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