joaco wrote:

Hello all , i know this topic is almost about pp experience but since im experimenting with electricity i like to share some thoughts here . I builded a dac using very high quality components . As you know the power supply is critical . So i decided to use dc from 24 ( 2 x12v)  volt batteri and listen to changes , i now assume dc from that battery is like very pure electricity from ac , regardless of what element one need to purify it . So it is not just the noise that become quieter , the istruments feels different , feels like they are tuned now . So i was wondering that pp working from battery might have the same effect , or similar effect and when connected to ac , noise must become part of the circuit somewhere . Anyway I will build another power supply , this time with a much larger capacitance to see if theres some effect with same voltage but much more capacitance . It seems very difficult now to feel the instruments the way they feel with dc . I think lower level (little signals) are very sensitive to noise and one must take care from the lower level signal up to the amplifier , i do not know what effect may have pp when connected to ac in the lower level signal

Jumping the bridge would only get one the PP's "pure" DC (I hope...), and the question that churns in my mind is, how does the PP's DC/AC converter not mess up the sound?  Yes, there will likely be switching noise, and it is also quite likely that there is some sort of step-up involved, to keep the processing unit smaller.  And I suspect that this step-up is - somehow - the source of the "umami".  If to jump the amp's bridge, then the AC/DC is still in play along with the battery, and according to people who comment online, AC mains and possibly self noises get through the PP balwarks.  Since there seem to be a few people who get acceptable electricity most of the time from operational PPs, and since this aceptable AC may yet scope poorly, where and what is the critical additive factor?  Remember, even the big PP only uses a 7 Ah battery, which is what I use to drive my tiny DAC. And, as Romy graciously pointed out, using a really big battery would fuse the PP AC/DC circuit...

Best regards,
Paul S

Canuck wrote:

Romy        Have you ever tried a PUREPOWER device feeding something like the Torus RM20 which  has a huge transformer and then out to the components? The Torus stores a lot of energy in those huge transformers. Do you feel this would have any merit?    Also, what about skipping all that and using something like a highend honda inverter generator( can even use remote startup). In your opinion would something like this work ?

Romy the Cat wrote:

It was an interning event last night. The sound turned incredibly bad from electricity perspective. I did not have anything like this for a year or so it was very bad and it was clearly electrical. The PP2000 was working fine and the distortions in the raw side of the wall were incredibly low – it was almost a perfect sinusoid. Still, despite that there were no visible signs of problems the sound was horrible and disconnection from the grid did fix all problems immediately. I was wondering what it might be. Today I was talking with Pure Power asking about the shipping date of my PP3000 and I asked them if they experience anything similar. They told me that they did observe that they have witnessed that noise between neutral and ground med some systems go sound. This is very interesting as I did not monitor this noise. I was under impression that this noise is constant for any given inhalation but PurePower suggests that it is not. Well, yesterday there was first day of rain, perhaps it wet ground and did make something special ground condition that made the day special. Who knows… I uselessly measured the voltage between neutral and ground and anything under 1.5V I considered acceptable however I did not look into the noise level and noise structure. Today sound is fine and I did make some initial digs. I will compare them with the day what the sound will be VERY good or VERY bad. Take a look This is the neutral and ground noise at the exit of PP2000.  All above is .5V per square.  This is the neutral and ground noise at the entrance of PP2000.   This is the neutral and ground noise at the wall, the entrance of PP2000 with PP2000’s main switch off. This is the same as above only with .05V per square. Then I desided to hear how the noise sounds. I took my HP selective voltmeter and filter out all sun 10.000Hz. The nose was very distinctive 33dB and with very characteristic whistling.   Let to see what other day will bring. I am very curious to know what it will be. Is it possible that THIS nose makes all difference? It would be not a big deal to shunt this nose with a cap; I wonder how it will affect sound…. Rgs, Romy the Cat