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Are All Mullards Created Equal?

I want to upgrade the rectifier tube in a CARY SLP-05. Began a search for Mullard 5AR4, which a majority of you on the site agree are preferable. Is a Mullard a Mullard regardless of who they were built for, manufacturer codes, base color, fat base, metal base, etc, etc? help...
erfranke
hifimaniac
508 posts
 
There is a web site I stumbled upon that had some opinions on all sorts of different tubes. I purchased some Mullard 6922's from the site. I think it is Brent Jesse Recording or something like that. I don't know if he reviews this specific tube but it might help.
rtn1
535 posts
 
I believe the 5AR4s from the 50s to early 60s, built in England and Holland, are most desirable. Fat base, brown base, and metal base perhaps more so. These will be at a premium, but supposedly, they are indestructible.
rodman99999
6,128 posts
 
The Blackburn Plant 5AR4/GZ34/CV1377(especially 1958-62, F31 series) = #1(ie: http://cgi.ebay.com/LOOK-NOS-NIB-f31-Fat-Base-Mullard-GZ34-5AR4-/360331594538?pt=LH_DefaultDomain_0&hash=item53e56fcb2a)
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