Interestingly, besides the strong +/-500 Hz sidebands, there's no trace of 60 or 120 Hz. Battery power? If not, good power supply and grounding work, despite the, ummm, issues elsewhere.
Interestingly, besides the strong +/-500 Hz sidebands, there's no trace of 60 or 120 Hz. Battery power? If not, good power supply and grounding work, despite the, ummm, issues elsewhere.
I hope its not the same one I own...
Let's hope its not Keith's Mola Mola
Even if it's a NOS DAC with dropping HF response, surely that wouldn't explain the massive 30dB difference in noise levels between low and high frequencies?
Without understanding the specifics of the type of engineering required and its restrictions, is it a tube amp?