How to test KT33C with Knight 600 Tube Tester ?

According to an older Sams Tube Substitution Handbook I have, the 25A6 can be substituted for the KT33. According to references on the web the KT33C is identical to the KT33 except that the KT33C provides a filament center-tap connection on pin 1, while pin 1 is unconnected on the KT33.

Therefore I suspect that settings for the 25A6 will work for the KT33C. I don't guarantee that, however :-)

Regards,
-- Al

Have you reached out to tube vendors Jim McShane, Brent Jesse or even Kevin at UpScale Audio? They may be able to help you with your request. When I saw KT33C I thought you made a typo for 6C33C tubes.

Hello all, still got no idea and chart data to test.

Hey Jedinite24, I'm living in Asia , not USA.

Hey Almarg, I got the 25A6 setting on the chart:
(7)
circuit 4
filement 25
load 34
up 3-4
down 2
(4)

Well, as I said the settings for the 25A6 should work, and I'd feel pretty confident that they will. But I'm saying that based on the information I cited, and therefore I can't be 100.0% certain.

Regards,
-- Al

Hi Redoctober2

Even though you are in Asia both Brent Jessee and Jim McShane would still help you. Just do a web search and e-mail them with your question. I've asked them stuff many times and they responded back to me in detail and were very professional.