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Old 14th July 2005, 12:06 AM   #1
VoLCoM is offline VoLCoM  Canada
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I am running my 3875 gainclone with a 4ohm load and i have a big heat sink made out of aluminium that measures about 7.5" x 3" x 1/8" full of fins on one side and they are about 2 inches long. My two chips are on the same heatsink and when the volume is at maximum it gets pretty hot. i don't know if it's normal...it's my first gainclone
should i buy another heatsink??? or its completly normal.... i searched the forums and they say that running the gainclone at 20v shoudn't dissipate any heat (mines runs at 20volt AC before rectifier and 28.5V DC after )
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Old 14th July 2005, 12:23 AM   #2
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What about the sound? Good and loud or not as loud as you assumed?

At full volume it's normal if it runs warm/hot but take care of some points:
- are the chips isolated? If not are they isolated mounted?
- check inputs and outputs: may the gc oscillate (capacitors with wrong values)?

Some pics would help...

Michael
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Old 14th July 2005, 01:03 AM   #3
VoLCoM is offline VoLCoM  Canada
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Quote:
Originally posted by slackman
What about the sound? Good and loud or not as loud as you assumed?

At full volume it's normal if it runs warm/hot but take care of some points:
- are the chips isolated? If not are they isolated mounted?
- check inputs and outputs: may the gc oscillate (capacitors with wrong values)?

Some pics would help...

Michael

The sound is very good and loud

the chips are 3875TF (isolated)
and for the oscillation .... i bought a kit from Peter Daniel and installed everything that came in the kit so i guess they are the right values


But at low volume everything's alright i guess the heat is normal. and when i put a 8ohm load the temperature is even lower. i tought the 3875 couldn't handle 4ohm impedance
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Old 14th July 2005, 01:26 AM   #4
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That heatsink is thin for the PSU voltage you are using and to drive 4 ohm speakers.
It's more indicated for convection cooling.
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Old 14th July 2005, 01:28 AM   #5
VoLCoM is offline VoLCoM  Canada
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ok, i'll find another heatsink....what are your suggestions??? ...that was just a heatsink i had lyin around... and decided to use it because it was the biggest i had
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Old 20th July 2005, 09:36 PM   #6
DcibeL is offline DcibeL  Canada
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The heatsinks offered in this thread look like they would work great for a chipamp, as long as they are still available at $10 for 2 you really don't have a lot to lose.
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