It depends on the bias current and rail voltage. A +/-24v Class A running at 1.25amps is 60w dissipation. I have a 4U and that’s about 45C so 3U would be possibly 55C to 60C, right at the limit of what is acceptably touchable with bare hands. But if running high bias of 1.5amps or 1.75amps, 3U is too small (unless a small fan is also employed).
I personally like Class A amps with small heatsinks and quiet fans now as size, weight, cost are much more manageable with CPU coolers and PWM fans as done on the Alpha series. Here with a Alpha BB dissipating 200w per channel, two compact and silent $25 CPU coolers keeps the MOSFET body at only 15C above ambient.
I personally like Class A amps with small heatsinks and quiet fans now as size, weight, cost are much more manageable with CPU coolers and PWM fans as done on the Alpha series. Here with a Alpha BB dissipating 200w per channel, two compact and silent $25 CPU coolers keeps the MOSFET body at only 15C above ambient.
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My listening room runs at 27c (Arizona) and I use the same 3U that P16 runs. No thermal shutdowns for me, and I'm running max bias at this point.
I probably have the warmest room of anyone here. The amp design has double thermal protection. The 3U is just fine.
I already mentioned these details but to be objective:
Power Supply => +/- 27V
BIAS => 1A
Measurement of heat sinks at 25° in a room => 48°
*bla*
Fine. And now explain us the relation to this topic please
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| grp info: #221,#1 , Quebec DIY . Sign up , you find the relation , relative , specfied.
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| grp info: #221,#1 , Quebec DIY . Sign up , you find the relation , relative , specfied.
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