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RE: a few weeks back I posted these and got a few mixed reviews.

So your saying your substituting 5Z4's for GZ34? The ad says they are 5Z4 equivalents.
Those aren't subs. 5Z4 is a glorifed 5Y3 with a bit lower voltage drop.
I use NOS 5Z4 in my Champs for a bit more plate voltage, but surley wouldn't run them in any amp calling for GZ34's. They may work for awhile in your amp, but may cause a problem in another if it's designed for GZ34's.
Maybe you got lucky. Maybe not. Good luck!!!


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  • RE: a few weeks back I posted these and got a few mixed reviews. - JSTRM 03/25/1008:43:01 03/25/10 (0)

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