diyAudio Forums Archive > Top > Amplifiers > Pass Labs are my aleph 2 heatsinks big enough ? - Click HERE for Original Thread dhole I have started my next quest. And it shall be the Aleph 2. I have blagged some heatsinks fro old radio transmitters approx 4 if need be but I would like to use 2 . They measure 40.5cm x 9.5cm x 12 cm the are bigger in places . I have included a link to some pictures. They are pretty big and chunky . I hink there is enough surface area to fit 12 mosfets on but I will have to custom build the boards they go on. I would be interested knowing peoples opinion as wether they are fit for an aleph 2 . regards dave http://www.geocities.com/dhole23/heatsink001.jpg http://www.geocities.com/dhole23/heatsink002.jpg http://www.geocities.com/dhole23/heatsink003.jpg http://www.geocities.com/dhole23/heatsink004.jpg http://www.geocities.com/dhole23/heatsink005.jpg http://www.geocities.com/dhole23/heatsink006.jpg http://www.geocities.com/dhole23/heatsink007.jpg http://www.geocities.com/dhole23/heatsink008.jpg TheJudge Thermal Resistance = SQRT(50 / A) Where A is the total surface area in cm². MikeW Maybe Aleph 5's:smash: dhole thanks for the.............. short replies. I guess I could have done some measurements before asking. I have now got the heatsink xls file that was posted and will atempt to use this to calculate something. If I post htese results perhaps people could advise some more. regards dave dhole I have the following information from the heatsink xls. Can anyone advise as to how this translates into usefull information on determining how many of these heatsinks I would need to use per monoblock of 100w aleph 2 ....pls Thermal Ratings Per Fin 6.1824 deg C / Watt H/S Body 14.4668 deg C / W Total 0.3027 deg C / Watt TheJudge Multiply the heat in watts the Aleph 2 produces by 0.3, then add something like 24 for the room temerature and you will have the temperature of the heatsink. dhole cheers I am busy now searching for the "aleph 2 temperature" Anyone know ? I ambusy searching a million posts as we speak. dave dhole doh as in 300 watt idling ?.... Stabist If I understand correctly - you would like to use 2 heatsinks/channel - so you have 150W dissipation on each HS - so 150W * 0,3K/W = 45K -- and after adding average room temp of 25°C - you get 70°C on heatsinks ... moe29 at first glance they look a little small to me... but pictures make everything look small. at the least you would want to use two per channel. dhole I think I might try 2 per mono. The only problem I forsee is that they may have to be ontop of each other for aesthetic reasons. I could have a gap inbetween I guess. Oh well I'll give it a go. Just got to but load of Irfp240. Anyone have an estimate how many I would need to get 24 matched. I wil start with 50 and see what happens... dave MikeW 70 is going to be hot. If you stack them it will be hotter. Build the 5's with some extra outputs and if they are not hot enough turn up the bias.:hot: :hot: moe29 you only have to match 4 groups of 6 FETS, not all 24. you should have plenty to get what you need.

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