Does anyone recognize this "KT66"

[Tom_r]

I bought an amp on the auction site and it came with this pair of International Servicemaster "KT66" tubes. They say they're Made in Japan. They have the standard type octal base vs the GEC type base. And they look more like a 6L6GC. The plates look like those used by Sylvania. And AFAIK I/S wasn't always 'accurate' with their labeling! LOL

Wondering if those cute little discs at the top of thee support rods might jog someones memory.

 

[maxhifi]

Take look at the bottom of the base, it could be possible to get some info from that.. USA tubes never have numbered pins or some other features which some imports have. Probably they are Japanese 6L6GC

 

[Tom_r]

Just had a peak:

-pins are numbered
-has 8 pins vs my US made tubes which are missing pin 6
-no other markings of any kind anywhere on the base

I'm wondering maybe Matsushita? I'll check into that tomorrow.

 

[mpholland]

I'm going with NEC 6L6GC

 

[Tom_r]

Looks like a winner to me! Thanks for posting that.