Jeff Rowland amp in unbalanced mode

Power Factor Corrector, PFC:
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Hello Guido,

I have noted that you and Dave endorse Jeff Rowland PFC with emphasis on 385 DC voltage. However, this is not "real" voltage.

The PFC allows the power supply to draw a sinusoidal current from the mains. This will reduce electrical pollution and highly spiked currents that can generate undesirable harmonics from the amplifier to the other equipment. Consequently, the PFC minimizes the harmful electrical and nasty audible effects of many older traditional power supply designs. Also, the PFC reduces the need for filtering; Finally, there must be a small energy storage capacitor which may or may not be used for energy storage. These are positives of PFC.

The PFC output is, indeed, 380 to 400VDC but it is NOT isolated from ground i.e. - you touch it - you dead (DEAD). To isolate it from ground, requires a DC:DC converter which has a transformer isolation. The output voltage from Dc:Dc is a "real" voltage and you better ask your favorite manufacturer what is it and much more importantly - is it regulated. In other words PFC is semi-regulator and DC:DC converter, in theory, can be fully regulated. In traditional liner power supplies, the partial regulation can be better then PFC - its not easy but best linear power supply have it....

If you want to share with us what Jeff Rowland does with PFC output then it will be very interesting.

Thank you in advance.

All The Best
Rafael

"Rafael and Dave, the active PFC circuit of the PC1 is in fact used in series with internal DC2DC transformers of compatible devices to optimize voltage regulation. Unfortunately I am not an electrical engineer and my technical knowledge is limited. G."

Hello Guido,
Yes, we do know that PFC must work with DC:DC converter. That was not a question. The qestions to which only Mr. Rowland can answer are:
1) is his DC:DC converter fully regulated
2) what is the peak voltage of the amplifier in quesion output (and what is its duration).

I am sure you undertsand these questions and you or Dave can ask Jeff Rowland for answer similarely as I ask Spectron people. If specs are good then nobody will hide them.

If I would read your writing above "... optimize voltage regulation" then it mean to me NOT fully regulated (just optimized) but I don't know if you meant it

Thank you
Rafael

Hello Guido,

"....you will get more precise answers by contacting JRDG directly."

Sorry, I am (very) happy owner of Spectron monoblocks and if I would call to Mr. Rawland - I would just waste his time since I am not potential customer of his amplifiers and I don't want to do it - I would feel very uncofortable.

FYI, if interested, Spectron power supplies are linear and not fully regulated but as you eloquently said "optimized"
meaning among other things that the choice of aftermarket power cord will have sonic consequences.

We can probably answer this question. If your 312 and Dave's Continium 500 do not react to the choice of the pwoer cord then their power supplies are fully regulated - ...I think.

All The Best
Rafael