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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Power conditioner or Hammond choke? Opinions... posted by RickeyM on June 20, 2007 at 18:16:17:
The Hammond choke tweak uses a large-value choke, 5 or 10 henrys, in parallel with the AC line. The large inductance provides significant reactance at the power frequency so the device does not draw much AC current with 120 volts across it. These devices have significant low frequency winding resistance (57 ohms for the 193L and 63 ohms for the 193M), so they do not present a short-circuit to high frequency noise. They appear to work by damping high frequency resonances with the winding resistance, as the core behavior drops out above about 5 KHz.
Some line conditioners have series chokes as part of their passive filters. These chokes have much smaller inductance values, as you do not want any significant reactance at the power frequency. They do attenuate RF noise in both directions (hence the "bi-directional" comment on the Powervar website page) and can be useful where their residual series resistance does not degrade the performance of the components connected down-stream.
You might want to try a Hammond choke connected to your AC outlet, and the Powervar in series with the digital source. These devices do different things, so the combination might work better than either one alone. If you are going to modify your Powervar, think about using antiparallel rectifier diodes in series with the AC safety-earth ("ground") lead. This tweak reduces low-level noise without compromising the safety function.
All that said, however, you may find the Powervar introduces its own sonic character even though it reduces digital noise. The steel box may be undamped and ring acoustically, for example.
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Follow Ups
- Parallel versus series application. - Al Sekela 06/21/0715:46:34 06/21/07 (0)
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