I thought I would report back as I have never tested heat sinks before, and it might be of interest to others.
I had bits to do a quick test as per the photo. 21v with 2 x 15R to ground, about 1.4A at 30 watts each, 60w in total, the F2J dissipation. Not sure whether the meter temp probe or the blimey test are the more accurate. After 1.5 hrs of cooking the resistors are at a constant 36C, the middle top of the sink back plate 33C and a middle fin 27C. Ambient is 18C. I can hold my hands on the sink fins indefinitely, and can keep my fingers on the resistor cases easily for 10 secs and more.
Good to go, you think?
BTW the case the sink is sitting on is reserved for the Sony Vfet Part 2. It used to house the Pass A20 from the 70's until I blew up a channel some years ago.
I had bits to do a quick test as per the photo. 21v with 2 x 15R to ground, about 1.4A at 30 watts each, 60w in total, the F2J dissipation. Not sure whether the meter temp probe or the blimey test are the more accurate. After 1.5 hrs of cooking the resistors are at a constant 36C, the middle top of the sink back plate 33C and a middle fin 27C. Ambient is 18C. I can hold my hands on the sink fins indefinitely, and can keep my fingers on the resistor cases easily for 10 secs and more.
Good to go, you think?
BTW the case the sink is sitting on is reserved for the Sony Vfet Part 2. It used to house the Pass A20 from the 70's until I blew up a channel some years ago.
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I thought I would report back.....
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