@facten
Thank you for the reviews. The hum issue, that the reviewer discovered, really bothers me. I also heard hum in a LM-216; JA found LM-518 to be noisy in his review in the Stereophile. Could these be the fruits of low quality manufacturing? What is the quality level of LM transformers? For example, the ultrasonic resonance that the JA discovered in his review of LM-518 was in my view unacceptable for an amplifier in a price class this high.
Thank you for the reviews. The hum issue, that the reviewer discovered, really bothers me. I also heard hum in a LM-216; JA found LM-518 to be noisy in his review in the Stereophile. Could these be the fruits of low quality manufacturing? What is the quality level of LM transformers? For example, the ultrasonic resonance that the JA discovered in his review of LM-518 was in my view unacceptable for an amplifier in a price class this high.