Jim Landers wrote:

I have a friend who is trying to talk me into trying a set of Rogers
EL84's. They were apparently made in Canada by Mullard years ago. Does
anybody have experience with this brand? Thanks. jrl

Almost certainly made by Philips Electronics Industries
at Ontario. Check out the etched codes on the glass, a
lower case 'r' is the Canadian mark, see :-

http://www.cs.helsinki.fi/u/oheinone...vm-coding.html
http://www.triodeel.com/philipsfactorycodes.jpg
http://www.triodeel.com/images/philipstubecodes.pdf

for the layout and the other codes.

I've also seen Rogers 12AX7s made in Eindhoven or Heerlen,
where the Amperex 'Bugle Boys' were made. Philips exported
components all over the place so they could print 'Made in
xxxxxx' on them. All that was done, at most, was final
assembly and pumping. Philips were notoriously dishonest
about the true sources of their products. Many of the
'Mullard' valves in the UK before the war were imported
from Holland and marked as made in the U.K, so that
Mullard could remain members of the BVA cartel.

These should be every bit as good as Mullards or Bugle Boys
of a similar date. Very late Mullards etc were often made in
Eastern Europe or Japan.

best

Andy