where to get tubes for effects/amplifiers?

[corrosivesubstanc]

specifically the Tung-Sol 12AX7 / ECC803-S Gold or any other tung sol tubes. wanna try exchanging the tubes in my amp/pedals. hopefully i dun spoil them . thks in advance for the help.

 

[templar03]

http://www.eguide.com.sg/Companies/Martin-Electronics

The auntie there is really friendly!

 

[zesn]

Woodwerkz @ Peninsula Exclesior Hotel.
They sell JJ tubes

Blackwood @ Bras Basah sells EHX tubes also if i'm not wrong