Originally Posted by mirumu
Xiang Sheng is a company in China but they seem to have many internet dealers in Hong Kong.
In my experience the tubes have quite a noticeable effect on the sound, especially the 6N3 and the 6N1.
Then I changed the Chinese 6N23 (6DJ8) to the Amperex-Holland 6DJ8 and found an improvement. Over the next few days I tried a variety of 6DJ8 and settled on the RCA stamped made in UK.
I am still waiting on the 6N3P EB tubes from Russia which I suspect will significantly change the sound as did chaging out the two 6DJ8.
Now, just got a message from j214 who advised me the front 6N1 tube is just cosmetic and not part of the signal circuit.
I initially suspected it was just cosmetic but it is powered so I wasn't sure. Changing it had seemed to improve the sound but I only checked this for a few minutes before changing the other tubes.
There are wires running to the circuit but these are likely just heater wires. So I simply pulled the 6N1P tube out and the amp worked without it - proof that this front window tubes is for looks but not function.