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F6 Small(ish) Chassis
F6 Small(ish) Chassis
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Old 16th May 2020, 01:48 PM   #1
ppinto1 is offline ppinto1  United States
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Default F6 Small(ish) Chassis

Does anyone have experience installing the F6 in a smaller or less expensive chassis than the 4U?

I built an Aleph J and F6 at the same time, thinking I'd switch the boards back and forth. Now, I want both amps; but I want to explore lower cost options for the F6.

Thanks in advance.
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Old 16th May 2020, 01:53 PM   #2
Zen Mod is offline Zen Mod  Serbia
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F6 Small(ish) Chassis
well, dunno what you use, but I know Store is favoring 4U/300

if we jiggle with numbers - 3U/400 is better than 4U/300, but dunno what's cost

considering that my preferred is 4U/400, I can't really give you recommendation for smaller than 3U/400
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Old 16th May 2020, 02:33 PM   #3
ppinto1 is offline ppinto1  United States
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Thanks ZM! A 3U/400 is a savings of over $100.
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Old 16th May 2020, 02:46 PM   #4
Dennis Hui is online now Dennis Hui  Canada
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F6 Small(ish) Chassis
Most excellent.

I prefer the 400mm length chassis for the F6 since it allows for better spacing of the
output mosfets on the heatsink and greater separation between the input and
power transformers.
We are fearless amplifier builders. A little heat doesn't scare us at all.
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Old 16th May 2020, 04:04 PM   #5
TungstenAudio is offline TungstenAudio  United States
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The 400 mm length is definitely helpful for allowing some separation between power supply components as well as spacing between devices on the heatsinks. My F6 is running with a +/– 26V power rails and 1.85 Amps quiescent current. The heatsinks are 3.5U (140mm) tall and 400mm long, fins are 35mm deep on a 9mm spine. I added aluminum L brackets between the heatsinks and the baseplate to spread more heat into the base. The case heats up pretty evenly, and gets pretty warm, but I can still leave my hands on indefinitely.

If you're building something closer to the standard F6 with 24V rails and 1.5 A Iq, then the 3U, 400mm long chassis is certainly large enough.
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Old 16th May 2020, 10:05 PM   #6
OllBoll is online now OllBoll  Sweden
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A nifty thing about the F6 is that it is a working Class AB amp, so if you want a smaller amp you could say set the bias to half which lets you get away with less heat sinking but you still get the same maximum output. You will leave class A earlier though and probably add some distortion although as long as the Class A window is large enough it's probably not that much of a deal.
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