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RE: Hope someone can help clear something up for me . . .

Posted by Tre' on June 16, 2017 at 14:15:32:
"Mullard made a lot of 12au7s for different brands"
This might be a little off topic but Mullard is a brand.
Philips owned a bunch of the plants back in the day and if they decided that some of the tubes made in their Blackburn plant in England should be branded "Bulge Boy" there was no one to stop them.
For clarity I should say that Mullard was a company of it's own way back in the 20's but they were bought out by Philips in 1927 and became one of many brands/plants owned and operated by Philips.
The tubes made in the Philips plant in Blackburn England are mostly labeled Mullard but not always.
Bulge Boy tubes where usually made in Holland but not always.
Here's my over riding point, any tube made in any of the Philips owned plants could bear any brand name owned by Philips.
The etched codes on the tube will tell you which plant the tube was made in, not the branding.
Tre'