John Curl's Blowtorch preamplifier part II - Page 4065 - diyAudio
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Old 24th June 2013, 06:16 PM   #40641
marce is offline marce  United Kingdom
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Wouldn't that requires a filter, a line cord is generally just that a few bits of wire, and if you use power line communications then your mains is already polluted.
Personally, I believe that if a power cord makes a difference you have some major problems with your set up.
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Old 24th June 2013, 06:22 PM   #40642
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You can do filtering in a line cord without adding any extra resistance. Harder to do with a mutual inductor.
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Old 24th June 2013, 06:31 PM   #40643
tvi is offline tvi  Australia
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filtered power cords
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Old 24th June 2013, 06:32 PM   #40644
qusp is offline qusp  Australia
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yes, most of these assertions seem to rely on mentioning levels, or locations of noise that have no bearing, or on the equipment you are using having such stupidly low PSRR that mV of ripple causes 'obvious' noise.

of course some of these things are just going to be ground loops caused by bad setup, combined with unnecessarily high and unused voltage gain
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Old 24th June 2013, 08:16 PM   #40645
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My best fixes for line cords are Bybee devices. (no kidding)
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Old 24th June 2013, 08:19 PM   #40646
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Yes, my STAX Lambda Pro headphone amp is one of the most sensitive components in my system with regards to changes in power cords. Must be those lousy 'subjective' engineers who made it. '-)
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Old 24th June 2013, 08:23 PM   #40647
qusp is offline qusp  Australia
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here we go again ... attention seeking again.

yet more sensitive and generally better STAX systems like DIY T2 paired with O2 seem unaffected ...

Last edited by qusp; 24th June 2013 at 08:26 PM.
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Old 24th June 2013, 08:24 PM   #40648
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The 'truth' hurts sometimes. '-)
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Old 24th June 2013, 08:31 PM   #40649
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The Pass D1 I/V stage deserves a better picture, here it is.

-Alex
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File Type: png Pass D1 IV.png (67.0 KB, 155 views)
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Old 24th June 2013, 08:34 PM   #40650
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I haven´t built it, but the D1 looks great for a volume control as well.

Maybe throw a few silonex LDRs in parallel there between Vol- and Vol+ ?

-Alex
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