Why Not KT-66?

[amandarae]

Hello again guys!

If I can use 6550/5881 on my SSE amp, why not KT-66? B+ is 425 and Rk=560 ohms.

thanks

Abe

[tubelab.com]

why not KT-66?

I don't know.....why not? They worked fine in my amp. I used the Chinese version because I don't buy expensive tubes, and I thought that they were one of the better sounding 6L6GC types. Watch for red plating, you might need to increase the cathode resistor. I have a 750 ohm resistor in my board and collection of resistors on alligator clips for tweaking the cathode current. I don't know what I used with the KT66's it was 2 years ago. I have been using KT88's or EL34's only for the last year or so.

[amandarae]

Originally Posted by tubelab.com

I don't know.....why not? They worked fine in my amp. I used the Chinese version because I don't buy expensive tubes, and I thought that they were one of the better sounding 6L6GC types. Watch for red plating, you might need to increase the cathode resistor. I have a 750 ohm resistor in my board and collection of resistors on alligator clips for tweaking the cathode current. I don't know what I used with the KT66's it was 2 years ago. I have been using KT88's or EL34's only for the last year or so.

Thank you George!

When I use 5Y3, I have VP=332, and Vk=26. At Rk=560, I am getting:
Pd=(332-26)*(26/560)= 14.2 watts.

According to KT-66 data when use as a triode, Max Plate is 400 and Power Diss(Pd) is 25 Watts.

I will try it. Thanks again!

Abe