No problem unless you want ear bleeding volume.
Or you're room is the size of a warehouse...
Thank you very much for your answers - good news for me!
Now I have an other question: can you recommend me please a case (chassis) proper for F6? I know there is Dissipante 4U (or 5U; deluxe or not), but maybe I will buy an other case from the Internet.
Can you help me please with your advice about proper dimensions and other aspects of the enclosure?
Thank you.
Now I have an other question: can you recommend me please a case (chassis) proper for F6? I know there is Dissipante 4U (or 5U; deluxe or not), but maybe I will buy an other case from the Internet.
Can you help me please with your advice about proper dimensions and other aspects of the enclosure?
Thank you.
To get an idea of the power dissipation with each channel of the amplifier biased at 1.5A, and with 2 x 23 volts rails = 70Watts dissipation per channel.
If you set your max temp on the heatsinks to be 45*C, and an average room temp of 25*C = a heatsink temp rise of 20*C.
So, the required heatsink rating is simply 20/70 = 0.28 *C/W and look it up in the case/heatsink description.
Oh, the information isn't available here for some reason or other but the Modushop website says, that the 200mm long heatsink (half of each side of the 4U case) that is the 165mm high case (4U size) with the standard 40mm fin length will get rid of 0.36C/watt - so pumping 70 watts into this short 8" long heatsink will increase in temperature by 25*C but as there's actually 2 pieces of heatsink per side of the case, this will theoretically get rid of twice as much heat so the temperature rise will be half as high ie, about 12*C - not very hot at all really.
Or, on the other hand, you can just reduce the height of the case to 3U size (0.5*C/W per heatsink on each side) for an approx 18*C temp rise.
For more details about heatsinks, go to the 'Conrad Heatsinks' website and they have plenty of details about various types and sizes of heatsinks that you can use to 'guesstimate' other case sizes
I hope someone will correct my maths if incorrect ...
If you set your max temp on the heatsinks to be 45*C, and an average room temp of 25*C = a heatsink temp rise of 20*C.
So, the required heatsink rating is simply 20/70 = 0.28 *C/W and look it up in the case/heatsink description.
Oh, the information isn't available here for some reason or other but the Modushop website says, that the 200mm long heatsink (half of each side of the 4U case) that is the 165mm high case (4U size) with the standard 40mm fin length will get rid of 0.36C/watt - so pumping 70 watts into this short 8" long heatsink will increase in temperature by 25*C but as there's actually 2 pieces of heatsink per side of the case, this will theoretically get rid of twice as much heat so the temperature rise will be half as high ie, about 12*C - not very hot at all really.
Or, on the other hand, you can just reduce the height of the case to 3U size (0.5*C/W per heatsink on each side) for an approx 18*C temp rise.
For more details about heatsinks, go to the 'Conrad Heatsinks' website and they have plenty of details about various types and sizes of heatsinks that you can use to 'guesstimate' other case sizes
I hope someone will correct my maths if incorrect ...
Agreed.. the 'store' pcb.. is .. problematic when it comes to fitting to a heatsink and avoiding the Tx.
One can centralize the Devices on the Heatsink .. on a DIY case , which is why I was forced into one.
That said; an F6 (mine at least) gives off surprisingly little heat.. really!
So heatsinking efficiency is not really much of a real life issue.
One can centralize the Devices on the Heatsink .. on a DIY case , which is why I was forced into one.
That said; an F6 (mine at least) gives off surprisingly little heat.. really!
So heatsinking efficiency is not really much of a real life issue.
Or simpler yet, just shorten the pcb - I've never understood this fascination of the official First Watt designs, and the diyA support of these extended pcbs with unnecessarily very long tracks.
Perhaps there is some audible or engineering benefit in designing the long lengths of the tracks on the PCB (?), and I'm just missing something obvious?
Perhaps there is some audible or engineering benefit in designing the long lengths of the tracks on the PCB (?), and I'm just missing something obvious?
If you have to use a 4U case (160mm high) then a standard 40mm long fin heatsink of 300 mm length (the side of the case) will be somewhere less than 0.3*C/W and if you bias up each channel to 1.5A, this will only give a temp rise of about 20*C
[a 3U case (120mm high) with a 300mm heatsink length will have a thermal efficiency a bit higher than 0.3*C/W and will only give a temp rise a bit higher than 20*C]
You really don't need giant boxes to build these amps - if you think to run this amp in a heatwave without air conditioners, use a slow fan - keep it simple!
A 300mm sided case would be quite suitable for the 2 power transistors to be about 150 - 200mm apart, and with some generous internal ventilation ...
[a 3U case (120mm high) with a 300mm heatsink length will have a thermal efficiency a bit higher than 0.3*C/W and will only give a temp rise a bit higher than 20*C]
You really don't need giant boxes to build these amps - if you think to run this amp in a heatwave without air conditioners, use a slow fan - keep it simple!
A 300mm sided case would be quite suitable for the 2 power transistors to be about 150 - 200mm apart, and with some generous internal ventilation ...
It’s nice to have another 100mm to get the power supply in more easily though.
not just heat ...... proximity of power xformer to input side can be critical, especially in case if you have signal xformers
so , as I said numerous time before , Modushop 4U/400 is Swiss Knife solution for FW format amps , from several reasons ..... dissipation capability and space .......
so , as I said numerous time before , Modushop 4U/400 is Swiss Knife solution for FW format amps , from several reasons ..... dissipation capability and space .......
Yeah, I guess that's true too -
On one F5 amp, with 350mm high heatsinks (Conrads) x 300 mm long sides (with the smaller pcbs), I did manage to 'shoe-horn' in a hefty 400va EI transformer plus a set of the large Siemens power caps (just cleared the top panel) then tucked in a set of Cap multipliers - a bit of neat engineering but it doesn't get much higher than a +16*C rise in temp - short tracks, short wires, excellent performance but a lot of effort.
I have a set of the long F6 boards fitted to the original factory F3 amp case - the temp rise is about 20*C with the amp running hard (1.7A bias) but there's not much room to add anything more.
On one F5 amp, with 350mm high heatsinks (Conrads) x 300 mm long sides (with the smaller pcbs), I did manage to 'shoe-horn' in a hefty 400va EI transformer plus a set of the large Siemens power caps (just cleared the top panel) then tucked in a set of Cap multipliers - a bit of neat engineering but it doesn't get much higher than a +16*C rise in temp - short tracks, short wires, excellent performance but a lot of effort.
I have a set of the long F6 boards fitted to the original factory F3 amp case - the temp rise is about 20*C with the amp running hard (1.7A bias) but there's not much room to add anything more.
Thank you very much for your advices; very useful for me.
As a conclusion: Certainly I'm also very interested in this UMS.
So, for the moment we are 4. Another one person and this good hope to become reality.
As a conclusion: Certainly I'm also very interested in this UMS.
So, for the moment we are 4. Another one person and this good hope to become reality.