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In the Forum: Melquiades Amplifier
In the Thread: Valve Preamplifier for Macondo/DSET
Post Subject: You are getting somewhere...Posted by Romy the Cat on: 8/14/2020
This is very interesting, Anthony. I do think that absolute polarity has own role to play. Also, do check the DC that might be sent out of your preamps, certainly with Placette and with your 10Y before the transformer. Chas it with disconnected Milq and positive bios will kill any DC offset from preamp. You might also try to measure the AC voltage on your Milq’s input with and without connected preamp.
Another a very valid thing to try is to see of the same difference with the same recordings happens with different DACs, preamps the you will take care of the absolute phase. You see, different DACs topology have different post DAC filters and they send different amount and different type of UHF into the upstream chain. Your 10Y is UHF limited and in a way acts as low pass filter, which is not necessarily a bad thing. Placette is wide open monster in UHF, in fact it might run a video signal with is very good for it but not necessarily good for music. I in a past observe a phenomenon that Placette was very much picky to what I used in DAC output filters. I have some CDs that if I play them with Bidat vs. Lavry Gold DACs they sound like very much different recordings and the difference is VERY different than a typical delta between Bidat vs. Lavry. If do the same experiment with a different preamp then the difference will be between the DACs but in completely different way. In most of the cases TLO-Lavry Gold with Placette has too much “resolution” and too ferocious dynamics that is superbly impressive to thrill audiophiles but not so musical and I tend do not use this combination.Rerurn to Romy the Cat's Site