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liquid cooled F6
liquid cooled F6
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Old 14th November 2016, 04:26 PM   #1
fabrice63 is offline fabrice63  France
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Default Liquid cooled Class A amp

Hi everyone,

this is my liquid cooled amplifier , made with Pass F6 boards from the Diyaudio store

it took me 6 months to desing and build it , Bias is 0.550 v , and supply is 24.5 v , they are quite steady .

Power supply is CLC type with 5 mv ripple for each rail , and DC offset is about -5/+5 mv .

Components are the best available for such make , and the result is what i was looking after .

this amp is dead quiet , and the sound is nearly perfect ( to my ears !!)

the Mosfet are in the water , and their temperature is 17 °c over the room temp .

fan and water pump are noiseless .

it gave me his best after about 20 hours running in , since that it's all pleasure ;-)

a nice wooden chassis to avoid any kind af interferences .

and , most important , the less wire as possible .


here are some pics


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Last edited by fabrice63; 4th December 2016 at 05:34 PM.
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Old 14th November 2016, 04:49 PM   #2
amplidude is offline amplidude  Denmark
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Looks really neat ...congratulations.. Tell me how did you encapsulate the outputs...was thinking about some of same ideas for my AMP project cause its forced air cooled and not at all Quiet ... Was considering cnc made water blocks.. But have no acces to the machinery unfortunatly... But again vers Nice building.. Set some thoughts here
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Old 14th November 2016, 06:18 PM   #3
Destroyer OS is offline Destroyer OS  United States
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liquid cooled F6
No worries about water leaks? Who made those transformers?
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Old 14th November 2016, 06:43 PM   #4
silverprout is offline silverprout  France
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Wow effect is here !

The fan should be around 9dB and the pump around 20-30dB at one meter IMHO.
My desktop is watercooled since 12 years (near all parts are original buyed in 2004) and the liquid is 6 years old... no leaks.
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Last edited by silverprout; 14th November 2016 at 06:45 PM. Reason: near
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Old 14th November 2016, 06:54 PM   #5
MASantos is offline MASantos  Portugal
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You should really post this on the PASS LABS sub forum!!

A few questions:

1.Is there any heatsink connecting to the transistor?

2.How to you isolate each transistor leg?

3.Can you get a temp. reading of the mosfet case?

Last edited by MASantos; 14th November 2016 at 06:57 PM.
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Old 14th November 2016, 07:41 PM   #6
xrk971 is offline xrk971  United States
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liquid cooled F6
Nice work. You weren't kidding, the outputs are literally in the water.

I have wanted to make a redneck (American colloquialism for a low tech country-boy implementation) version of a water cooled class A amp by bolting the outputs to the outside of an aluminum (cook) pot/pan of water. Have a system to auto add water level and the water heats up and evaporates. Size is large enough so never boils - want to keep warm below 50C or whatever.

The outputs here are not in the water so less care has to be taken and the chances for leaks (other than tipping pot over) are nil. Won't look as cool though of course.
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Old 14th November 2016, 09:27 PM   #7
pauly99 is offline pauly99  Australia
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Old 14th November 2016, 09:27 PM   #8
keantoken is offline keantoken  United States
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Electrolysis through the water could cause some interesting failures, I would think electrical isolation between the transistor and water would ruin the benefits of water cooling? Unless the P and N outputs were on different water lines? Also dissimilar metals in contact with each other and the water would also cause electrolysis like in water heater anodes.
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Old 15th November 2016, 01:05 AM   #9
aoc is offline aoc  Malaysia
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There might be some mutual coupling between + supply, reducing isolation of dual mono supply

Alex
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Old 15th November 2016, 02:53 AM   #10
xrk971 is offline xrk971  United States
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If parts in contact with water are all of similar metal and deionized water is used, should work well and not have electrolysis issue or electroplate issue. High voltage flashlamps for lasers (3 to 10kV and many amps) routinely run submerged in DI water for cooling. A deionizer packed bed filter is often in loop to ensure that the water stays relatively ion-free (Mohms). Problem arises when disimilar metals are used (brass, zinc, copper, stainless steel, aluminum, etc.)
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