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Thanks very much for the advice/info.
That is a very helpful link.
Let me know if the hiss is gone.
Also, I suggest buying a couple more driver tubes (stock is 6N8S) and experiment with the sound ;)
compatible are also any of these -
6080,6AS7 or 6N13 offer the best value for money.
I bought a Tung Sol 6SN7 and was using that. Switching back to the tube supplied by Dark Voice the unit goes almost silent so I think that you are correct in your thoughts on the driver tube. Have several other 6sn7s and am going to try them also. Thanks for your guidance.
If you have any high impedance headphones (300 ohm or higher) , you can use them until the tubes are fully conditioned.
High impedance headphones are less susceptible to the ill effects of poorly conditioned vacuum tubes.