My new Luxman CL38U-SE has these tubes. They give a nice warm detailed sound w/good bass. Never heard of them has anyone used these tubes, What's your opinion. Not looking to change tubes now but down the road any other brands I might try??
Shuguang 12AX7LS black tubes from Grant Fidelity are superb. Not cheap. Good from the start, they need about 20 hours to sound right and improve up to 50 hours. I think they outshine Telefunkens.
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