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In the Forum: Melquiades Amplifier
In the Thread: Single-stage Melquiades vs. DHT amps
Post Subject: Why I Let Other People Build Them, IIPosted by Paul S on: 5/4/2009
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The pisser with the AC filaments is that they "sound better" in terms of immediacy and proper acceleration, and the sound "quality" with them is obviously more "lifelike". But too often the damn things are just plain noisy. I was thinking I remember that you do not use connecting wire unless you have to, but you solder most of your components end-to-end, where possible. And I think this is the best course, especially with the AC filaments; just put the damn parts right on the tube pins. Some guys insist that dropping resistors should extend directly "down", in in line with and directly under the tube/socket, and some guys double their filament chokes, reversing the windings as "humbuckers", and or hook them right to the pins.
Anyway, really quiet (2-stage) DHTs are few and far between, and, as I noted way up the thread, I have never heard a really quiet DHT with AC filaments. too bad I cannot say exactly why this is.
Lastly, not all tubes work their best [for audio] in any/all positions. Some tubes really have to be vertical and kept under control to do their audible best in some circuits/systems. I mention this because I am not sure exactly how you run all the tubes.
Best regards,
Paul SRerurn to Romy the Cat's Site