![]() ![]() I am going with a 3-way gain switch and a 21-step stepped attenuator from china. bad channel balanced interferes with proper imaging. you can easily measure the channel imbalances in the stock pot with a multimeter. Replacing the stock potentiometer with something better like an alps blue velvet. no other modifications required to run 6SN7 besides the proper kind of adapter and they are significantly better tubes in just about every aspect buy a 12AU7>6SN7 adapter and never look back. Throw the stock 12AU7 in the trash or break it open and sacrifice it to the audio gods for a good sound for a thousand years. This is a great amp, especially with HD600 and HD650, and there are also a ton of easy and relatively inexpensive mods that make it better and better
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