Sinks arrived yesterday from GB.
purchased directly from Birmingham Aluminium.
Good service nice price and awesome pacing.
http://www.bal-group.com/heatsink_d...=100&calc_air_flow=0&update=Update#calculator
DHL door delivery
The sinks are 84mm x 100mm x 300mm equals 0,282degC/W
Recomended.
Thanx to Jean for posting the Birmingham A. sinks in post 270.
Perfect
purchased directly from Birmingham Aluminium.
Good service nice price and awesome pacing.
http://www.bal-group.com/heatsink_d...=100&calc_air_flow=0&update=Update#calculator
DHL door delivery
The sinks are 84mm x 100mm x 300mm equals 0,282degC/W
Recomended.
Thanx to Jean for posting the Birmingham A. sinks in post 270.
Perfect
An externally hosted image should be here but it was not working when we last tested it.
I ended up buying twice as big as these heatsinks. I had become a heat paranoid after researching. Sigh...
Wow. that should please even the hottest transistors.
Whats the size / brand of sinks you purchased?
P.
You can't be too rich or have too large heatsinks.
Wow. that should please even the hottest transistors.
Whats the size / brand of sinks you purchased?
P.
It's good to know that I was not totally wrong. I was somewhat skeptical about my heatsinc purchase.
I got second hand ones, so no brand, about 200x280x85mm/ch. It's still cost me a fortune, since I'm building multiple channels.
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Cool, how far are you in the build?.
Pictures
New sinks from BAL is not that expensive though.
Asked for wrong length the first time (lenght equals height of the sink when installed in the amp)
Asked for a quote for 2ea 300mm length ( = height) x 300mm x 84mm.
The price was just over 100euro each incl shipping to Norway.
Shipping cost will of-course wary.
P.
A larger heat sink is a good think ... Lower junction temps will make the devices last much longer.
At a few dollars the piece, how long do you wish them to last.
In present value, the price of a power device nowadays is a mere fraction of the cost 25 years ago.
When I started building power amps with vertical MOSFETs in the mid 1980s, my rule of thumb was to spend half on the output devices and half on the heatsinks.
At a standard die temperature, chances are more likely that the output devices will outlive the amp and/or the owner.
And if they do happen to terminate themselves within 2 decades, the write-off for the power devices will be in the order of a dime a year.
(A bit like yesteryears automobiles, where the engine far outlived the car. Up to this day, there are literally thousands of small motoryachts overhere with a propulsion by a marine converted Mercedes OM636, a car/van diesel engine that hasn't been manufactured for over half a century)
Not cutting corners on heatsinks has a better chance of obtaining the desired operating temperature.
If they turn out oversized after all, it enables to bias the output devices harder : there's never enough quiescent current !
Cool, how far are you in the build?.
Pictures
New sinks from BAL is not that expensive though.
Asked for wrong length the first time (lenght equals height of the sink when installed in the amp)
Asked for a quote for 2ea 300mm length ( = height) x 300mm x 84mm.
The price was just over 100euro each incl shipping to Norway.
Shipping cost will of-course wary.
P.
I've got heatsinks, PCBs, and JFETs from Spencer, that's it...