Which best 5U4GB rectifier tube- Mesa Boogie or ??


New to tubes here and have a pair of 300b SET 8w monoblocks. I'd appreciate your learned opinion of which of two rectifier tube choices would be best. And if you could tell me what differences might be hearable between the two, all other things being equal, it would be appreciated.
The tubes I have are (1st) new Mesa Boogie 5U4GB and (2nd) used PhilipsECG 5U4GB. The Philips lable looks like this:

JAN 5U4GB
PhilipsECG 8652
34167 USA AAX

Your comments are appreciated.
Happy listening!

myraj

Showing 1 response by newbee

jim, FWIW, The 12ax7's i last received from Mesa were absolutely identical physically and sound wise to EH's (they were relabled however to mesa logo). They do not sound similar to the chinese. Frankly thats not a recommendation for either.