If you want to try NOS, stick to Tungsram 6922s. Those and the premium only Russian tubes mentioned above, are the only tubes you can count on for superior reliability and sound. I’ve had more than 30 yrs enjoyment from my 3a and 3b, following this mantra. When I ventured astray, I paid the price.
Audible Illusions Modulus 3A noise
I purchased the AI M3A, love the sound, do not like the high noise floor - much more noise on one side now after only 10 hours or so of use. Reading through forums I suspect the electro-harmonics tube. Is a louder than normal static noise coming through speakers normally a tube issue?
Thanks for your help!
Kevin