F-5 heatsink query

[Russellc]

Just wondering if anyone out there has tried the heatsink USA's 10.080 inch extrusion heatsinks for a F-5 build. Seems M&M metals wants to double (almost) their price, so I'm looking for other sources. Jeez, I can order Conrad from down under and get them cheaper even with delivery!

Heatsink USA seems to be the only other manufacturer located domestically,
thus I was wondering about sufficiency of their sink for F-5.

Russellc

[WithTarragon]

Originally Posted by Russellc

Just wondering if anyone out there has tried the heatsink USA's 10.080 inch extrusion heatsinks for a F-5 build. Seems M&M metals wants to double (almost) their price, so I'm looking for other sources. Jeez, I can order Conrad from down under and get them cheaper even with delivery!

Heatsink USA seems to be the only other manufacturer located domestically,
thus I was wondering about sufficiency of their sink for F-5.

Russellc

Russell, Do a search.
There are good reports about those heat sinks and what size is adequate.

[flg]

F5 For Low Z Loads ?

I measured 4 devices dissapating 125W
Even a 6" section shouldn't be any problem at all for 64W

[tinitus]

Originally Posted by Russellc

Just wondering if anyone out there has tried the heatsink USA's 10.080 inch extrusion heatsinks for a F-5 build. Seems M&M metals wants to double (almost) their price, so I'm looking for other sources. Jeez, I can order Conrad from down under and get them cheaper even with delivery!

Heatsink USA seems to be the only other manufacturer located domestically,
thus I was wondering about sufficiency of their sink for F-5.

Russellc

Heatsink Aluminum Extrusion 10.080" Wide x 12" Long - eBay (item 170612188395 end time Mar-13-11 06:11:48 PDT)

one each channel should be fine

but maybe this cheaper one will be adequate too http://cgi.ebay.com/Heatsink-Aluminu...item27b9453340

[Russellc]

Originally Posted by tinitus

Heatsink Aluminum Extrusion 10.080" Wide x 12" Long - eBay (item 170612188395 end time Mar-13-11 06:11:48 PDT)

one each channel should be fine

but maybe this cheaper one will be adequate too Heatsink Aluminum Extrusion 10.000" Wide x 12" Long - eBay (item 170612044608 end time Mar-12-11 17:33:32 PST)

Yes, this ebay seller (Barrredboss) is the same guy as HeatsinkUSA. I saw that profile, but I assumed the other was better since it was the same width approximately, one 10.00 and the other 10.080. but the extrusion you show has 1 inch fins where the other has 2.5 inch fins. It probably doesnt make much difference,
I'll have to compare prices. The 2.5 inch fin version is very reasonable. Also, those are 12 inch lengths, I was looking at the 8 inch section for an amp approx. 8 inches tall. My reading is that the extra height doesnt help much, its more the depth. I can say the M&M metals sinks, 12 inches deep and 6.5 inches tall, stayed at a temp you could keep your hand on indefinitely, at least in a 1/8 inch aluminum chassis. (first F-5 build)

I'm in hopes a section this size on each side would be sufficient,
but it is just shy of Nelson's recommendation in the F-5 service manual/article.

May have to go conrad.

Russellc

[tinitus]

Originally Posted by Russellc

Y. It probably doesnt make much difference,
I'll have to compare prices. The 2.5 inch fin version is very reasonable.

Russellc

oh, but it does
I just got the impression you didnt have enough money
if you can afford the long fin model, thats the one
one for each channel ofcourse

[Woody1911a1]

Originally Posted by flg

F5 For Low Z Loads ?

I measured 4 devices dissapating 125W
Even a 6" section shouldn't be any problem at all for 64W

so a 6"+ section of it is sufficient per channel for a stock f5 ?

[flg]

I suppose for the benifit of all the potential std F5 builders, I could disassemble two of the FETs and run my tests with 23.5Vd-s and 1.3A/FET
I'm about to add another sink to the backside as discussed in th low Z thread.

[WithTarragon]

Originally Posted by Woody1911a1

so a 6"+ section of it is sufficient per channel for a stock f5 ?

That's doubtful. It is probably 6" per device, so you would need 2 of these per channel.

Also, someone dismissed the difference between 1" and 2" fins: you want the 2". This does make a difference.

[Woody1911a1]

Originally Posted by WithTarragon

That's doubtful. It is probably 6" per device, so you would need 2 of these per channel.

Also, someone dismissed the difference between 1" and 2" fins: you want the 2". This does make a difference.

that's not what i got from flg's post and there's been much bickering about the heatsinkusa sinks . would prefer real stats rather than speculation .

cheers , Woody