KT-77 vs. KT-66
As I've had my QS Mono 60s, I've tried a variety of tubes. I have sold off my KT 150s, and use KT-88s from time to time, but what I really love are KT77's.
I'm thinking of getting some KT66s, thinking that lower powered tubes are better (to my ears) matches for my system. I just don't know what the KT-66's sound like.
Question: If you have compared KT77 and KT66 tubes, what would you say the sonic, audible characters of each are? Is there a difference you can hear? What does the KT66 sound like -- to you?
@hilde45 I am still a bit baffled by this he says not to use EL34s but you can use KT66 and 6L6 but also KT88s and KT150s? |
Jond, FWIW, it's probably the the plate difference between the two amps which determine which tubes you can use. I don't know, but I'd risk a bet that the amp which can use EL34's has a plate voltage of 450 volts. The 500 volt unit would probably stress the EL 34's and cause them to fail. FWIW KT66's, 6L6gc' s and other 6l6 variants are not all equal, electrically speaking, so I wouldn't recommend that you use them without making sure that your amp would be appropriate for a specific tube. |
just remember, flexibility in use in a piece of gear (especially tube gear) usually trades off peak performance optimization even with true auto bias now offered in some modern tech tube amps, if a designer/engineer truly optimizes his unit for a certain sound and certain performance parameters, you will hear what is intended in an amp that is specific to a particular, specifically chosen power tube (think audio research amps over the years) power tube type selection, matching to its driver stage, and output transformers is key as these elements together provide a chosen performance envelope into whatever is anticipated as a range of speaker loads the optimization ’point’ can be loosened into an ’envelope’, which buys you something (the option of running various types of power tubes) but it gives up something too think of it in a photography analogy -- given a certain aperture and light condition, there is a specific focus setting that gives the sharpest image at a certain object distance... crude auto focus or fixed focus cameras still let you shoot the picture, but what is captured becomes necessarily murky compared to what is optimized |
