I have nearly new pair of JA30s with KT90's factory fitted. Are any changes or re-calibrations required when changing between KT90s, KT88s or 6550s. Or is it a straight swap?
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.
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.