The Chinese 6DJ8 drew a bit more heater current then the standard Russian 6922 if my memory serves me. So a different value resistor was used for the Chinese tube. The Chinese tube was stock at the time that preamp was manufactured.
The 7308 is the top of the line tube in that category. The Amperex is an excellent tube. Very low noise. Provided it is a legit Amperex. It should have a number etched in the tube I believe.
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