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Replacement of 5Z4P tube

Posted by Tubers on June 3, 2012 at 10:38:37:
I recently took the delivery of a cheap Chinese SE amplifier. It has two 6L6G tubes, two 6N8P tubes (which I subsequently replaced with 6SN7WGT tubes) and one 5Z4P rectifier.

I believe it would be unreasonable to pay $350-$400 for a pair of RCA 6L6GC tubes when the amplifier costs $300.0 incl. shipment, but is there any reason in replacing the 5Z4P tube with its vintage equivalent? Does it influence the sound?