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

Product:
Vacuum Tube - 6CA7, Electro-Harmonix

Question:
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?