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Ampeg B2 fan direction (sucking vs. blowing)

O

okwestern

Jun 1, 2020
63
10
#1
Hi! Could someone tell me if the fan of my B2 should suck air into the amp via the fan opening? Or if it should blow through the fan opening?
Also, would anyone know the CFM this should have? I suspect the previous owner replaced it with some generic fan, and only looked at voltage and diameter.
 
#3
Based on the circuit it is used in (not a common way to control a fan, but a good design nonetheless), I am about 99% sure it's a 48 volt fan and it's Sunon part number PMD4808PMB2-A which is not a common part.

You might give Ampeg a call and see if they have one available (or at least verify that the information I provided is in fact correct). That would be the best approach, especially given the fact that the fan control circuit is unusual.
 

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