Disconnect the DAC. Noise gone? It's the DAC. Noise still there? It's the amp.
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So when I turn on the amps only, not a sound. When I turn on the preamp, but keep it muted, I hear a hum in both speakers. It’s a hum with a slight buzz. When I unmute the preamp, I have a hiss over the hum. Is it the preamp or something before it in the chain?The tubes in the preamp are over 10 years old.