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RE: Replacement of 5Z4P tube

IIRC, a GZ30 is mighty close to the U.S. 5Z4. Mullard made GZ30s will carry hefty price tags.

Be very careful with Chinese types. For instance, the 5Z3P is a 5U4 "equivalent", with an Octal base. A U.S. made 5Z3 is electrically equivalent to the 5U4G, BUT the base is (sic) UX4.


Eli D.


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