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advice for retubing of Jadis JA80

I have a pair of JA80, currently using GEC 6CA7 as a power tube. If i were to retube the power tube, eg: current product EL34, 6CA7, KT77, what are the factors i should look into, please advice.
And also what is the best power tube (tube model & brand to fix in a JA80, that would produce the best sound for it?
Any expert can provide some idea for small tubes(12ax7,12au7 with brands; Nos or current product) to change the tonality.
Thank you
samcsc

Showing 2 responses by samcsc

samcsc OP
3 posts
 
it should be GE 6CA7 as a power tube,typing error.
Samcsc
samcsc OP
3 posts
 
Hi:Rcp, Thanks for your vaulable opinion.
My JA80 is an early 90's(~1990-1991) production. I bought it from a friend and was told that it has only been used for a short period of time.(less than 200 hours), The power tube that came with it is a stock tube(GE 6CA7), if i'm not wrong.
I listen more on classical, piano, vocal and jazz.
I'm thinking to change the power tube in order to find the best sonic to suit my taste.
For NOS power tube is very expensive now, so that i would think of getting a current porduct to subsititue with it.
If i consider to get other power tube, do i need to rebias?
Samscs
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