Postby Marshall Mann » 24 Jan 2014, 23:39
Hey CR,
Yes, the 6CA7 is a drop in replacement in any EL-34 amp.
Personally I prefer a 6CA7 to a El-34 (but this is only my preference, to each their own). Tone wise a 6CA7 has a little more low end grunt and a smother top end than an EL-34, but you do loose a bit of the upper mid detail that the El-34 carries.
For CP comparison purposes, durability wise they are the same as an El-34.