Heat sinks for A-30 / Mini-A

[troystg]

Hi all-

I have a question on heat sinks for a mini-A / A-30.

After looking long and hard @ the A-30's horizontal heat sinks I "think" these mounted vertically would work.

I am looking for educated guesses to confirm or deny.

The ones I have are rated @ .5c/w for a 3" section. Mine are 8.5" tall.

I will post a few pics.

[troystg]

Post 2...


Waiting 60 seconds.......

[troystg]

Post 3...

Waiting another 60 seconds.......

[troystg]

4 with layout..

Doah! Too quick... Waiting......

[needtubes]

Any chance you might share where you found these?

My semi-educated guess seems to think they would be ok.

[tja]

Originally posted by rabstg
Hi all-

I have a question on heat sinks for a mini-A / A-30.

After looking long and hard @ the A-30's horizontal heat sinks I "think" these mounted vertically would work.

I am looking for educated guesses to confirm or deny.

The ones I have are rated @ .5c/w for a 3" section. Mine are 8.5" tall.

OK, rule of thumb #1 says double the height, divide by 1,4 which gets us a 6" section rated @ .35K/W. Rule of thumb #2 says after 6" dont expect much more, so conservatively I'd say 8.5" piece should get you .30K/W, maybe .25K/W. Aleph 30 burns 100W/ch, so one sink per channel should give you a temperature rise of some 30C above ambient, which seems acceptable, depending on how hot it gets where you live .

Take

[troystg]

Originally posted by needtubes
Any chance you might share where you found these?

My semi-educated guess seems to think they would be ok.

You'd be amazed at what plating shops throw away as scrap or junk.

Originally posted by tja



OK, rule of thumb #1 says double the height, divide by 1,4 which gets us a 6" section rated @ .35K/W. Rule of thumb #2 says after 6" dont expect much more, so conservatively I'd say 8.5" piece should get you .30K/W, maybe .25K/W. Aleph 30 burns 100W/ch, so one sink per channel should give you a temperature rise of some 30C above ambient, which seems acceptable, depending on how hot it gets where you live .

Take

Rgr that and thanks. I thought they would but was hoping for a second opinion. If I have to I will turn down the bias a tad and listen.

I'm going to double that for the Krell KSA-50 clone.

[uli]

Hi Troy,
as the rating in K/W is dynamic (-> depends on the temperature
rise ) you should be careful. Rod Elliotts Heatsink Calculator shows
0,37 K/W for 30 degrees allowed rise above ambient (25-55).
Not enough for A30.

Uli