Five 1.25" diameter ports have almost the same cross sectional area as a single 2.5" diameter port. You could use the 5 ports if you wanted to, but there is no difference in vent air speeds between the two options.
Wayne Parham Messages: 18723 Registered: January 2001
Illuminati (33rd Degree)
Interesting amp - Class A 300B with Lundahl output transformer. Have you built it yet? Have you ever heard another amp with those parts in that basic configuration? Or is this a brand new thing for you?
I encourage you to post this link in the SET forum too; I think people will be very interested in it.
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