Has anyone tried 6CA7"s in their Diezel?

I have a stash of EH 6CA7's and was curious if anyone had used them in a Diezel amp? I know they come with KT77's, which I also have several of, but are there any issues with the 6CA7's?
 
Camping here... i heard someone talked about the 6CA7 but no many from the larger Diezel guys... except for 6L6 KT77 & EL34... and many also raved about 6550 dispite Peters disapproval... the power transformers cant support enough for 6550 i supposed? And heat dissipation...
 
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