Yes that is a VTI BL-304 rack, it's good to know the 5U will fit in the bottom. That's an F5 biased at 1.5A in there now and there are no heat issues. I suppose I could try an F5T down there and see what the temp difference is vs. running it in open air.
If I run it on the floor I thought I'd get another VTI bottom shelf to raise it a bit.
@McQuaide - We have the same family of rack. So, yes - if you have the 9" bottom rack, then you can just squeeze one in. I don't think the anti-vibration feet are all that wonderful IMHO, and if you install just the standard feet, you may gain even just a tad more clearance. See below for the fit with the anti-vibration feet. Current sink temp (stabilized) with the F5 at 1A8 is 47C in a 21C room. Enjoy!
That's a standard F5 biased at 1.8A or .85v? Mine runs at about 50c biased at .7v, in the 4U case.
Hi Mark -
Yes. Standard F5. I wandered over to this thread after contemplating how to potentially try something with more current for 4ohm speakers. I'm just learning.
I think I understand your question - Yes. With my standard 0.47ohm resistors it's roughly 1A8 / 0V85 with a rail voltage of ~24V loaded, I get ~39 to 40W on the device. Still trying to get my arms around all the bias calcs for the various amps etc.
I did my set up originally at 1A5 / 0V7, and it was running ~43 or 44C if I recall correctly. I also use an el-cheapo laser thermometer off of Amazon, so I have no idea if my temps are accurate. I usually try to find the hottest spot on the direct opposite of the device.
If we have the same ambient... then it's kind of cool (see what I did there) to know how much additional cooling the 5U provides.
Yes. Standard F5. I wandered over to this thread after contemplating how to potentially try something with more current for 4ohm speakers. I'm just learning.
I think I understand your question - Yes. With my standard 0.47ohm resistors it's roughly 1A8 / 0V85 with a rail voltage of ~24V loaded, I get ~39 to 40W on the device. Still trying to get my arms around all the bias calcs for the various amps etc.
I did my set up originally at 1A5 / 0V7, and it was running ~43 or 44C if I recall correctly. I also use an el-cheapo laser thermometer off of Amazon, so I have no idea if my temps are accurate. I usually try to find the hottest spot on the direct opposite of the device.
If we have the same ambient... then it's kind of cool (see what I did there) to know how much additional cooling the 5U provides.
My room is around 22C and I use the same type of thermometer. I don't think I'll push it past the 50C I have now.
I was looking at these fans, maybe a couple of them would work on an F5T.
https://www.amazon.com/dp/B00TYN3HD6/?coliid=I10B416D4Q7BIK&colid=27YEI70P4L5LZ&psc=1&ref_=lv_ov_lig_dp_it
24v rails, original f5 feedback arrangement. Dual pair toshiba mosfet.
About a year ago I changed it to 32V rails, f5 v2 style but no jfet cascode.
I think I prefer the sound of the 24v rail version. But I need the headroom of the 32v rail version.
Basically I have had all iterations of f5 except v3. I have tried Fairchild, IRF and Toshiba outputs. To me, bias is the most important aspect in an f5.
About a year ago I changed it to 32V rails, f5 v2 style but no jfet cascode.
I think I prefer the sound of the 24v rail version. But I need the headroom of the 32v rail version.
Basically I have had all iterations of f5 except v3. I have tried Fairchild, IRF and Toshiba outputs. To me, bias is the most important aspect in an f5.
If you have questions specific to the F5 (and not F5 Turbo) you may get quicker responses
in an F5 specific thread (such as: An illustrated guide to building an F5 )
in an F5 specific thread (such as: An illustrated guide to building an F5 )