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In the Forum: Melquiades Amplifier
In the Thread: 6 Channel Version of Super Melquiades
Post Subject: Sakuma said the preamp is lungs of a playback….Posted by Romy the Cat on: 1/23/2008
Thanks, Jim, and thanks to everyone who replied in direct emails. Summarizing what was advised to me it looks like as now the input impedance of the amp is around 4.5K. That was roughly what I would like to have, though I would like to go even further. Perhaps I need to use lording resistor of much less value. I wrote in the past that my cables love current-loading. Perhaps I would even need to drive the entire voltage of bias gas tube across the cable as I did in past and to see how it will bias the sound of the cables. Meanwhile, while my Preamp at Guy’s tune-up shop I asked him to drive the buffer impedance all the way down to a few Ohm and to bias the output stage as hot as possible. I do not think that I will be able to make the final conclusion about the appropriate loading until I have my bass channel is connected and my "new" preamp back. I do detect that sound is very dramatically change with 6-way amp when I rise output impedance of mysource. I have no preamp now as use the vintage (means sounding nutral) EVS attenuators. The Bidat with it 38R output impedance drives the new  6-ch Super Milq just fine. Juts two clicks on the EVS attenuators made sound to lose dynamics very substantially. Well, here is why those “strange” people are trying to make a preamp using 6C33C….

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