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 1 response by puremusic

Trelja,

I had used the EL34s on my JA30s and loved their delicacy so much so that I kept the JA30s as a back up when I bought the JA80s. For more power and bass, I went with the 6550A on the JA80. However, my Wilson WHOW subwoofer is driven by a separate (solid state) amp. Perhaps, the EL34's bass limitation may not apply in my system. The crossover on the WHOW is at 53Hz. At what bass frequency did you notice the EL34s begin to give up?

Great Listening,
John