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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 24th June 2013, 07:16 PM   #40641
marce is offline marce  United Kingdom
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John Curl's Blowtorch preamplifier part II
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, 07:22 PM   #40642
simon7000 is offline simon7000  United States
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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, 07:31 PM   #40643
tvi is offline tvi  Australia
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filtered power cords
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Old 24th June 2013, 07:32 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, 09:16 PM   #40645
john curl is offline john curl  United States
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My best fixes for line cords are Bybee devices. (no kidding)
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Old 24th June 2013, 09:19 PM   #40646
john curl is offline john curl  United States
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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, 09:23 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 09:26 PM.
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Old 24th June 2013, 09:24 PM   #40648
john curl is offline john curl  United States
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The 'truth' hurts sometimes. '-)
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Old 24th June 2013, 09:31 PM   #40649
Alexandre is offline Alexandre
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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, 166 views)
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Old 24th June 2013, 09:34 PM   #40650
Alexandre is offline Alexandre
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I havenīt 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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