Reporting question for Vacuum Tube - 6CA7, Electro-Harmonix

Vacuum Tube - 6CA7, Electro-Harmonix

I have an original 210/65 Music Man with the original Sylvania 6CA7's, which are still working great (I've continuously used the amp at half power since 1977). Do these EH 6CA7 compare favorably to the Sylvania's as well?

We feel that the EH 6CA7 is a great option in a new production tube. We do not have any direct experience in comparing the EH to a Sylvania but they are compatible.