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I've been checking possible replacement tubes off and on lately. I have a line on a NOS 25VAQP22, but I am not sure if it is a possible replacement.
I know the following information.
I have a 25VBQP22 in the set (looked like a D in the picture, confirmed with the Sams).
Per a 1976 Zenith interchangeability guide, the 25VAQP22 and 25VBQP22 (also equivalent to a 25VBNP22) are both replaceable by a 25VCNP22.
Per a 1982 Zenith guide, the 25VAQP22 is listed as a direct replacement for the 25VBNP22.
I am fairly confident that the 25VAQP22 will replace the 25VBQP22 based on that chain of equivalences, but I was wondering if anyone has information regarding this?
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