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Old 9th September 2011, 02:11 PM   #1
nickds1 is offline nickds1  England
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Default QQQ (Quick Quad Question...)

Got no experience of owning & running a 405, so....

Just a quicky (!) - What is a reasonable temperature for a Quad 405-2's heatsink to get up to when driven by a 10kHz sine wave at 65W into 8 ohms for, say 20 minutes...

No oscillation going on - put it on a spectrum analyser to make sure - clean to 5 MHz. THD+N is at 0.011% - pretty much same on both channels.

I'm seeing about 55C on the output transistors - what would people regard as reasonable for this naturally-aspirated (no fan) amp with the lid open?

Thanks

Nick
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Old 9th September 2011, 02:18 PM   #2
jez is offline jez  United Kingdom
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That would be about right at 55c. Surprised it's not a bit hotter actually after this amp killer of a test...
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