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Or is this pretty much a one-source tube?
"Lock up when you're done and don't touch the piano."
-Dr. Greg House
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Mike there are plenty of NOS EL84 to be had. I did not care for the Genelex too bright for me. My favorites were Sylvania Blackplates. I also liked old stock Mullard but they are pricy/
Steve O is right,
I have been using the Russian 7189, military long lasting in my Scott 222, it is as close to spec if not better than any El84 "M" They need some break in and can be a tad gruff, but after awhile they sound great and wont break the bank.
I have a regular quad of EL84 new genalex repro gold lion, they are not "M" which is the military grade, but should also work fine, have not tried them yet, but if they are anything like other gold lion re-pros they should be top notch.
If your question is more geared toward, "simply" can you find good tubes for an EL84 amp, the answer is yes and they are plentiful, but specifically if you need the "M" best advice I can give you is use the Russian 7189.. EL84's of whatever type are probably my favorite tube, they just do every thing well.
...but definitely not as rugged as the 7189/EL84M/6π14π-EB types. Jim McShane has a strict warning on his tube page against running these GLs over 12W dissipation. I had a couple fail even at 11W. It may have had something to do with my amp, but several other compatible tubes had no problems.
Incidentally the GL is slightly larger in diameter than most EL84s and may not fit some tube shields or shielded sockets.
Not entirely sure of your question because obviously, there is a huge variety of mfgrs/brands/sources for plain old EL84s. If however you're asking about the so called EL84M I'm aware of only NOS Russian items. Even these are a bit confusing because you have the 6P14P-EB(EV) a "5,000hr" device and the 6P14P-ER(ED)(EP) a "10,000hr" device. Both are sold as the Russian "EL84M" on epay and other places. Physically, the two are nearly identical but the ER device has two little flag type g1 radiators while the the EB does not. FWIW, the original EL84M as marketed by Sovtek/New Sensor in the early 90's was the longer lasting ER type but relabeled as EL84M. I think most of tubes labled as the EL84M that are available today from the typical sources are of the EV variety. Even the Russian epay sellers with original military surplus stock don't always clearly distinguish between the two in their auction descriptions. If the pics are good, you'll see the Cyrillic EB or ER as part of the type designation or you'll see the grid radiators on the ERs.I've used the ER version of the EL84M in a couple of apps that tend to beat the crap out of 6BQ5s for well over a decade w/o issue and they're still running strong. I even like how they sound but this is definitely personal preference.
Edits: 07/06/12
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