Thanks for the reply.
I understand the need for more bias, using more output fets would allow me to spread the dissapation if I was to increase the bias to 3.5 or 4 Amps. I was more concerned with bandwidth limitations and such changing the sound texture of the circuit. What are your thoughts on this.
Bill
I understand the need for more bias, using more output fets would allow me to spread the dissapation if I was to increase the bias to 3.5 or 4 Amps. I was more concerned with bandwidth limitations and such changing the sound texture of the circuit. What are your thoughts on this.
Bill
Bill Fuss said:
It's a pity most of you guys building stuff like this, lives so far away....I've got more heatsinks laying around than one person could ever use
Magura 🙂
Magura said:
It's a pity most of you guys building stuff like this, lives so far away....I've got more heatsinks laying around than one person could ever use
Magura 🙂
It seems to be a common problem here in the States unless you have deep pockets, and mine aren't very deep. I'm waiting for Russel Boss to get his extrusions to production.
is it too inefficient to mount heatsinks inside the chassis with top/bottom panel ventilation?
I'm not sure if it's doable with Class A.
reason I ask is I prefer to hide the heatsinks. would prefer not to use a fan.
I'm not sure if it's doable with Class A.
reason I ask is I prefer to hide the heatsinks. would prefer not to use a fan.
What sinks are recommended for Aleph J?
Okay not which ones exactly, but how much heat are we dissipating and whats the thermal resistance we are shooting for? The Pass manual talks about how much power the amp uses and from that we can subtract the power to the speakers and assume the heat, but still the thermal resistance is in question. Little help please?
Uriah
Okay not which ones exactly, but how much heat are we dissipating and whats the thermal resistance we are shooting for? The Pass manual talks about how much power the amp uses and from that we can subtract the power to the speakers and assume the heat, but still the thermal resistance is in question. Little help please?
Uriah
udailey said:
100W/ch diss.
say that you're good if you use 'sinks with 0,25K/W ; one per channel
The F5 need ~.3C/W per channel since each mosfet needs .6C/W.
So, pretty much I could get away with using the same sinks with an F5 as with an AlephJ.
Is that about right?
ZM I assume you mean C/W when you say K/W.
Thanks
Uriah
So, pretty much I could get away with using the same sinks with an F5 as with an AlephJ.
Is that about right?
ZM I assume you mean C/W when you say K/W.
Thanks
Uriah
udailey said:
nope ;
there is slight
difference between ~60W/ch dissipation of F5 and 100W/ch dissipation of Aleph Jso - 'sinks adequate for F5 are eenyweeny for Aleph J
K and C are same drek , they just have 0 on different place
Okay okay, crazy Serb is trying to eat my wallet!
One more please ZM. Are we shooting for 20C over ambient temperature rise of the heatsink with J as in F5?
I am really not trying to make the J an F5 just trying to get a chassis/sink combo that I can use for both. Looks like 2 sinks per channel and use only one of them for F5.
Uriah
One more please ZM. Are we shooting for 20C over ambient temperature rise of the heatsink with J as in F5?
I am really not trying to make the J an F5 just trying to get a chassis/sink combo that I can use for both. Looks like 2 sinks per channel and use only one of them for F5.
Uriah
Heatsinks is a topic I always get hung up on.
I'm getting ready to put an enclosure together for a J. What I'm considering vertical box with heatsinks from barrredboss on eBay. He has an 8.5 inch profile that can be cut to length.
Would a 12 inch section per channel mounted vertically be enough? Or should I go bigger?
Sorry for the ignorant question.
I'm getting ready to put an enclosure together for a J. What I'm considering vertical box with heatsinks from barrredboss on eBay. He has an 8.5 inch profile that can be cut to length.
Would a 12 inch section per channel mounted vertically be enough? Or should I go bigger?
Sorry for the ignorant question.
udailey said:
read more Papa's pdfs ; he's certainly better in 'xplaining things to our woodenheads than poor ZM
25C over room temp is good enough , under condition that room have temp in which you're able to still breath in it ......
test of "you can keep hand on 'sink for 5 secs" is one of most practical tests you can find on this site .....
salesmonster said:
sorry - I can't see any handy link in your post ..... these days my eyes are already sore from too much googling .....
salesmonster said:
That's not an ignorant question, many underestimate the HS requirements. I think Conrad heatsinks' website has some pretty good info on general guidelines.
I'm afraid a 12" length loses too much efficiency for one channel, but if you had them cut to 6" and made the chassis 17" deep you would be right at the minimum. Side by side they are quite a bit more efficient. Still, bigger would be better.
Best, Bill
Yep! There's a matching 1/4" aluminum plate beneath the oak with stainless steel screen mesh sandwiched in between.