So, currently there is a very high impedance connected to the Line Input Transformers. At -40dB it is reduced by a factor of 10,000 which is 10,000 times the resistance!" At -20dB the reflected load is reduced by a factor of 100. However, that load is cut in half (resistance is doubled) for every 3dB of attenuation.
When set for no attenuation, the reflected load is simply whatever follows the volume control in the signal chain. "the impedance a TVC presents to a source is the reflected load in parallel with the inductive reactance of the autoformer. The Line Input Transformer is connected to 4 Transformer Volume Controls which in turn are connected to the grids of triodes (very high impedance). Maybe supersonic frequencies from the DAC are being "demodulated into the base-band which means, causes noise in the audio band" by the incorrectly terminated transmission line consisting of the preamp source driving a balanced cable to the line input transformer. I'm guessing my problem might be that the Line Input Transformer is incorrectly terminated. This time, the manufacturer either can’t or won’t provide such a fix.Ĭan anyone explain what the problem is and what we might do to fix it please? The predecessor to the K1X SACD/CD player had the same problem, and as you’d expect, with DSD fed to its DACs, but the manufacturer installed a brick-wall filter that eliminated it.
If the output of the SACD/CD player is causing audio band problems in the Absolare tube preamp: I’ve read that SACD/DSD produces “an enormous amount of ultrasonic noise (created by the noise-shaping technique used to achieve a respectable dynamic range in the audible part of the band) that can affect amplifiers and cause intermodulation problems in a largely unpredictable way”. The SACD/CD player is connected directly to the tube crossover.The tube crossover is replaced with an Accuphase digital crossover.When playing SACDs there’s no noise when: There’s no noise when playing standard CDs. A large collection of SACDs is unlistenable. The noise is present during quiet passages too. He’s experiencing noise like frying eggs and bacon when playing SACDs at a similar level to the music. I built a 4-way tube crossover for a friend.
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