Anyone knows where I can buy tubes? Namely 6L6 power tubes?

It's for my 5150. I went around City Square and Ampang Park and couldn't find any. All they have is KT88, EL34....

I know I can find them in Jalan Pasar but I don't like those brands. They don't last at all. Not even a month and they start blowing fuses in my amp.