Power Conditioners

I’m surprised in this thread and some others no mention is made of Sola ferroresonant transformers. 

https://solahevidutysales.com/mcr_portable_series_power_conditioner.htm

They’re not sexy looking, they’re heavy, they buzz, they naturally run hot, they’re not cheap and they’re hard to find (mostly because they’re made to order).

In spite of their drawbacks, not many other AC line conditioners do as much with so few components as a Sola.  No semiconductors of any kind.  No sacrificial MOV either, no need.

And yeah, I’ve used a MCR series for years and would not consider anything else.  And yeah, it lives in another room where I can’t hear it buzz.

Anybody tried Furutech GTO-D2 NCF or e-tp609 NCF?

I’m surprised in this thread and some others no mention is made of Sola ferroresonant transformers.

I don't see why- ferroresonant transformers make a fair bit of noise in their output, which should be a sine wave for best results. They are good at line voltage regulation, but otherwise make for a lot more noise on the line than the line would usually otherwise have.

“I don't see why- ferroresonant transformers make a fair bit of noise in their output...”


Noise attenuation

• 120 dB common mode
• 60 dB transverse mod

Is that a lot of noise on the output? 

Yes, because the waveform is not sinusoidal. So a lot of higher harmonics will be present that are rarely on the AC line. Electronics tend to be fairly sensitive to the 5th harmonic (300Hz in the US) which is much greater when a ferro-resonant device is used, unless there is a filter to remove the harmonics and thus restore the output to a sine wave.