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I noticed the buzzy noise is there even when I remove the preamp tubes, therefore the issue comes from power amp, don't you agree?
Now I am checking wiring connections from primary side of OT could be that they are wrong?
I have posted a photo previously .
Now I think the whole issue here is that due to my limited experience but mainly to the fact that I bought this bloody Chinese kit, the PT and OT wiring standard or most color convention doesn't exist at all. i was not provided with any schematics for the PT or OT neither for the kit but that is OK.
The OT has 3 colored wires (primary side) Black blue Red
It says on the label 3.3KOhm - 0 - 3.3KOhm (Black blue Red)
I connected the red to pin 8 on 5Y3 socket
I connected the blue to pin 3 on 6V6 Socket
I connected the black to pin 8 on second 6V6 socket
See photos of OT and connections: