Does Anybody Use EL37 tubes?

[RogerD]

I purchased a Crown SXA stereo amplifier that uses a quad of Mullard EL37 tubes. I have no experience with these tubes as to overall sound quality,bass,high frequencies,midrange,ect.
Any thoughts would be appreciated. BTW the tubes will be matched and NOS. The amp came with Russian 6N3C-E military tubes,so putting it back to original configuration.

 

[cjfrbw]

tdsl says similar, but not identical, to 6L6, so likely a very nice sounding tube.