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JADIS JA80 with 6550 or KT 88 or KT90 ?

My Jadis JA80 was built in April 1999 and came equiped from the factory with eight 6550 valves.

Before deciding to buy a new set of tubes, I would like to know some opinions about the advantage or inconvenience of using the KT 88 or the KT 90 tubes in my JA80.

Is there any experience of using these tubes (KT 88 or KT 90) in an amplifier designed from the factory to work with 6550 tubes?

Many thanks for your cooperation.
rato456

Showing 2 responses by szutinglee

szutinglee
91 posts
 
my jadis ja30 came with ei kt90 tubes and i haven't felt the need to change. i also haven't heard the ja30 with power tubes other than kt90, so i am kind of speaking blindly. i did change stock 12au7 and 12ax7 to nos tubes with great results.
good luck!
scottie
szutinglee
91 posts
 
from Jadis via email:
"JA30 is an autobias amplifier, it does not need any adjustment when you change tubes.
Kind regards,
JADIS Service Commercial / Sales Department
Chemin du Pech
11800 VILLEDUBERT. FRANCE
www.jadis-electronics.com
Tel : + (33) 4.68.78.63.30
Fax : + (33) 4.68.78.85.15"
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