So, I have two Powertubes:
Lapco #6 cut down to Phantom length
Stock Phantom Powertube
When using the #6, I was really having to crank my TPC, pressure on my Stab at 600, and a heavy main spring to get 280. Well, when I found out it was stripping my cup seals (see http://www.mcarterbrown.com/forums/c...cup-seals.html), I switched back to the stock CCI Powertube.
Now with my stock powertube, my Stab is at about 500 and my TPC turned out from where it was with the #6. I guess I'll be sticking with the stock powertube.
My question is, why is this happening? I am simply curious and want input from others here with more experience than myself.
Maybe the increase in open space of the #6 required more pressure. I believe the rule was:
Small spaces for 12s and large ports for CA.
I've used CCI valve tubes in every Nelson pump I've ever owned, and I owned them all, since 1987. It's a superior product. LAPCO's are a copy of CCI's. The only real benefit over CCI that LAPCO has is the varying valve diameters, if this is important to you.
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