PAPST manufactures a wide variety of muffin fans. In the DIGI-KEY
web catalog, users can bring up the dB ratings of the various models.
> Hams - especially the new generation of "baby broadcasters" - want
> amps that sit quietly on the table. In contrast, CB "amp contesters"
> actually *want* to hear those mighty engines roar. In both cases, the
maker
> aims to please the market.
> The cure for that is to add the optional Muffin-type fan on the air
> inlet. It doesn't increase the total airflow much - its main purpose
> is to make the incoming air very turbulent, so the transformer is
> cooled much more *efficiently* (along with most of the other
components on
> the power-supply side). But the price for that is a noisy fan, right
> onto the rear of the amp where you can hear it.
> I don't know what type of fan they supply, but low-noise Muffin-type
> fans are available that are at least 10dB quieter than the regular
> type.
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