Dear all,
I have one question. Is it possible to mount 8 of heatsinks on aluminium plate with dimensions 200mmx350mm. Heatsinks have dimensions 100mm x 85mm (fisher).
So, will be enough (if is it possible) for one chanel Aleph 5.
Thank's
I have one question. Is it possible to mount 8 of heatsinks on aluminium plate with dimensions 200mmx350mm. Heatsinks have dimensions 100mm x 85mm (fisher).
So, will be enough (if is it possible) for one chanel Aleph 5.
Thank's
Toni hi!
DO you have original marks for those Fisher heatsinks? So we could see K/W factor ...
Btw - one thing that is VERY important in your way of heatsinking - be sure that the base Al plate isn't bent a bit - and also check that heatsinks are really flat ... Otherwise you will get a very bad "contact" between surfaces - and so the plate will get much much hotter rhan heatsinks themselfes ...
DO you have original marks for those Fisher heatsinks? So we could see K/W factor ...
Btw - one thing that is VERY important in your way of heatsinking - be sure that the base Al plate isn't bent a bit - and also check that heatsinks are really flat ... Otherwise you will get a very bad "contact" between surfaces - and so the plate will get much much hotter rhan heatsinks themselfes ...
Dear Primoz,
I think that heat sinks have 1.9/W. It is very difficult to find them as a part number on Fisherelectronik.de. Any way I’m planning to use alu plate at least of 7mm thickens. Between surfaces I’m planning to use thermal paste so I think that will be a good thermal contact. As I said before, heat sinks have dimensions 85mm x 100mm with 40mm fins.
One more question about power supply. I’m planning to use, per monoblock, 2 x 33000mF-RIFA, 2 x 10000mf-KENDEIL and 2 x 3300mF-NIPON nichicon with dual rectifier and 2 x 28V 400VA transformer. Do you think that this would be enough???
Thank you for you reply,
Regards,
Toni
I think that heat sinks have 1.9/W. It is very difficult to find them as a part number on Fisherelectronik.de. Any way I’m planning to use alu plate at least of 7mm thickens. Between surfaces I’m planning to use thermal paste so I think that will be a good thermal contact. As I said before, heat sinks have dimensions 85mm x 100mm with 40mm fins.
One more question about power supply. I’m planning to use, per monoblock, 2 x 33000mF-RIFA, 2 x 10000mf-KENDEIL and 2 x 3300mF-NIPON nichicon with dual rectifier and 2 x 28V 400VA transformer. Do you think that this would be enough???
Thank you for you reply,
Regards,
Toni
tonistefanovski said:Dear Primoz,
I think that heat sinks have 1.9/W. It is very difficult to find them as a part number on Fisherelectronik.de. Any way I’m planning to use alu plate at least of 7mm thickens. Between surfaces I’m planning to use thermal paste so I think that will be a good thermal contact. As I said before, heat sinks have dimensions 85mm x 100mm with 40mm fins.
One more question about power supply. I’m planning to use, per monoblock, 2 x 33000mF-RIFA, 2 x 10000mf-KENDEIL and 2 x 3300mF-NIPON nichicon with dual rectifier and 2 x 28V 400VA transformer. Do you think that this would be enough???
Thank you for you reply,
Regards,
Toni
Hi Toni,
so - if you mount them e.g. 4 per side - you will get K/W around 0,5K/W//side - that would be enough for around 80W dissipation (or 160W on all 8 heatsinks) - and that's quite allright for A5.
Than again - by mounting them in height - you will not get so good K/W factor - because by increasing height the K/W curve flatens very quickly ...
It's not the thickness af Al plate that is problematic - and also not the thermal grease - which is, btw - a little bit tricky to use than noticable at first moment - the problem is - that you will rarely get really flat Al plate and really flat heatsink surface - ussualy both are bent a bit - so on the contact you get a big air gap - OK - it will be filled by grease - BUT - the trick with the grease is - there shouldn't be too many of it - and in the case of such gaps - it surely be too thick - and heat transfer will be far from good!!!
You have 2 solutions:
- to find someone with router that will flatten you heatsinks and/or Al plate
- to mount transistors on heatsinks dirrectly - and only use Al profiles (or smaller plates) to connect heatsinks together
About your PSU - I think it will be more than enough! Maybe just add some MKP or similar bypass capacitors!
Hi,
a third sollution would be to use enough screws to connect the heatsinks to the baseplate and so avoid airgaps.
William
a third sollution would be to use enough screws to connect the heatsinks to the baseplate and so avoid airgaps.
William
- Status
- Not open for further replies.
- Home
- Amplifiers
- Pass Labs
- Aleph 5