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I can't seem to get my pre-amp tubes seated properly

Posted by newanvil (A) on April 24, 2007 at 15:18:23

Hello, all. I've got a PrimaLuna ProLogue 2, and a couple of months ago I picked up a pair of the Phillips Holland Pope 12AX7s and a pair of the 1956 French Military Radiotechnique 12AU7s from Upscale.

They're all fantastic tubes, but the problem is that they don't seem like they fit in the sockets very well on the PrimaLuna. All four of the tubes seem to sit very loosely in the sockets, so much so that I occasionally get hissing sounds from one channel or the other. I can "fix" this hissing (kind of like a low-grade pink noise) by gently moving one or another of the tubes within the socket, but moving the tubes creates a kind of loud crackling noise which disturbs me. But by moving the tubes within the socket slightly, I get rid of the hiss.

I didn't have this problem with the stock tubes that came with the amp. It seems like the pins just aren't sitting in the sockets very well, which kind of makes it seems like the pins are dirty or they're not all touching the socket contacts like they should. Any thoughts?

Thanks.

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