Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Yosser on May 24, 2026, 12:38:22 pm
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Has anybody replaced the fan in this amplifier with a quieter cooling fan, if so what make and model did you use?
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Do a search for the mesa boogie cooling fan used in several models.
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The model of fan is Sunon kd2408ptS1 24vdc 1.6w 40cfm 33db P/N 13.A.GN
No longer available
https://uk.rs-online.com/web/p/axial-fans/1118358?msockid=07ae167ec7b0634d0bf30003c6a562ce
I would be looking for an equivalent but noiseless if possible.
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I've used several different computer cooling fans w/o difficulty. They are pretty quiet. Many of them come with a variety of inline resistors to limit speed, but it is easy to dial in your desired speed as needed.
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I was just going to say computer fans, but if your in the UK and ordering from RS check out EBM Papst fans,
I used to work at a Power Amp company and that's what we stocked, they were pretty good, and very quiet
Check them out on RS versus your Sunon for airflow and dB ratings, their about a similar price too, just a little more
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I was just going to say computer fans, but if your in the UK and ordering from RS check out EBM Papst fans,
I used to work at a Power Amp company and that's what we stocked, they were pretty good, and very quiet
Check them out on RS versus your Sunon for airflow and dB ratings, their about a similar price too, just a little more
I had a look a them before and the db rating compared to the Sunon, I couldn't ascertain whether 30db or (33db in the sunon) is actually quiet loud or not.
I know the one in the marshall amp is loud to the point that it may be a malfunction and as I am considering selling the amplifier it's a bit of a concern.
You would not notice it at band volume levels but it could be a nuisance in a recording situation.
I had considered using it as a stereo playback amplifier but that fan noise is a no no.
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If its really that loud then maybe it is getting a bit tired and rattling like my PC at the moment!
30dB is around the normal level for most of those sizes of fans I can imagine, seems that way when I'm looking at PC fans
I can recommend Noctua branded fans too, unsure if they come in 24V though, although you could alter that I suppose...
But if you are thinking of selling it then just something good and branded and reliable will do, the standard Sunons from RS are around £10 each