Hi Fpooyandeh,
Thanks for your comment on my set. You have a very nice set yourself!
I'm usinf the following tubes for the Ankoru:
845 = Shuguang Metal Plates
300 B = Western Electric
5Y3 = General Electric
6X5 = Bendix 5852
5R4 = Chatham
7044 = General electric
What about your tubes?
Did you try a lot different brands?
Regards.