TO-3 16 HeatSink - diyAudio
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Old 17th September 2013, 07:18 PM   #1
Krisfr is offline Krisfr  United States
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Default TO-3 16 HeatSink

What would be a good CFA project to use this heatsink with?

Each of the four quadrants are electrically isolated from the frame and the others.
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Old 17th September 2013, 07:42 PM   #2
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Looks like the basis for a big classA amp, say a Pass A75 if you can find the TO-3 mosfets.
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Old 18th September 2013, 06:53 AM   #3
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What's running into the center core pipe? Liquid nitrogen ?
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Old 18th September 2013, 07:46 AM   #4
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The center pipe coincides with the center core/motor of your usual axial fan, and keeps the airflow from the fan blades confined to the heat sink fins, where it belongs...
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Old 18th September 2013, 04:57 PM   #5
rsavas is offline rsavas  Canada
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Quote:
TO-3 mosfets.
Alfet makes latfets in to-3, newark/farnell(uk)
T0-3P package should also fit in place of a TO-3
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Old 18th September 2013, 05:07 PM   #6
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Exicon mosfets would also be an option, as they still make TO-3 devices in both flavors. It would be a departure form the original A75 design, but would still work.

Last edited by wrenchone; 18th September 2013 at 05:17 PM.
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Old 18th September 2013, 08:08 PM   #7
Krisfr is offline Krisfr  United States
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Thanks for all ...

I am looking for a AB amp of about 250 or 300 watt with Current feedback or dual differential, I have a Dynaco 400 heatsink too but less transistor positions. Maybe I could drill some more and double my outputs, hummmm...
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Old 19th September 2013, 12:40 AM   #8
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416 uses the same sinks as the 400, just drilled for more outputs.
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Old 19th September 2013, 11:50 AM   #9
AndrewT is online now AndrewT  Scotland
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3pair of 250W BJTs will give ~ 300W of maximum output.
3pair of 150W mosFETs will give ~220W of maximum output.

With the blowers operating well, the Tc will be lower than for a passively cooled amplifier. This could allow higher maximum output powers than stated above. I wonder if a sensible target would be 150%?
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Old 19th September 2013, 12:54 PM   #10
Krisfr is offline Krisfr  United States
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The MJ21194 has an Ft of 4 Mhz. I am leaning toward them, but would like use a better one than this one if it is available. I can put 4 pair on each channel so using the formula of Andrew T I could go up to about 400 a channel, but the power supply would be Huge. Any other thoughts on a better device would be welcome, I am not stuck on ON-Semi, but I do not want to go to mosFet either.
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