KT 88 with Leben cs 600

Thanks for the update.  I am aware of the above chart. Currently listening blissfully to some NOS EL 34.

Hope I get a good 5 years out of them.

Thanks again

But PS.

Should I ultimately try the KT 88, how does one decide the optimal plate voltage position?

@mdrone Plate voltage on the Kt88 is dealers choice. With the switch in the “up” position the KT88’s will be slightly more resolute. With the switch in the “down” position, the KT88’s will be slightly softer. You may or may not notice much difference. I believe the CS600x sounds better with EL34’s or 5881’s or KT66’s. One man’s opinion.

The KT88 is not a very good sounding tube relative to the other tubes your Leben can take looking at that chart the KT88 and 6550 are the worst of the bunch.

Jond,

i agree with you. Most KT88 amps have a hard, brittle sound that I don’t like and the holds for 6550.  Of the tube types listed, I particularly like the 350B (real Western Electric, very expensive), and 6L6 and KT 66 are also very good.