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09-05-2012 Post does not mapped to Knowledge Tree
manisandher
London
Posts 158
Joined on 09-05-2008

Post #: 1061
Post ID: 18581
Reply to: 18580
PP+3000 vs. PP2000... to come
fiogf49gjkf0d
Paul, I'm happy to compare the new PP+3000 to my old PP2000 and share my findings. The new unit has arrived in the UK from Canada and should be at my place this Friday.
It's true, I didn't particularly like the sound of the PP2000 running from its regenerator when I first received it. And though I loved the sound from its battery I just couldn't live with having to constantly switch between the two whenever I wanted to listen to music. In any event, I ended up with a pair of class A monos which made running from the battery totally impractical. The PP2000 then sat down in the basement gathering dust. Meanwhile earlier this year, I switched to a fully balanced AC set up. Even being fed by the house AC, the two 5KW balanced transformers sound very good. My dedicated earth sits on the secondary of the transformers, so is isolated from the AC feeding the transformers. But I wondered whether the PP2000 might do a better job at feeding the balanced transformers than the house AC, and it seems I was right - the sound has been elevated quite a bit with the PP2000, even in regenerator mode.
I'm not really expecting the PP+3000 to sound better than the PP2000. Actually the only thing I'd like to change about the sound I'm getting right now will be impossible unless I change my speakers. So the PP+3000 isn't really in the quest for better sound. I just wanted another unit so that I could feed the two 5KW balanced transformers separately from two PP units. But of course if the sound is improved in some way, I'll happily take that.
Mani.
09-05-2012 Post does not mapped to Knowledge Tree
Jorge
Austin TX
Posts 141
Joined on 10-17-2010

Post #: 1062
Post ID: 18582
Reply to: 18581
Isolation trafo
fiogf49gjkf0d
Hello Mani,

I am using a 10KW balanced transformer on my system with dedicated earth just as you are, I use two 110V power lines to enter making it 220 volts on the primary and get 110 volts on the secondary with the earth.  I have a rod in the garden for ground.
I cannot listen to my system anymore without it.
I have been, with no hurries, looking for a PP solution: first the batch was not uo to specs, then the problem was fixed and then the new PP units from Canada showed up!  anyway.
How do you feed the balanced transformer from the PP unit?  do you feed two positives and get the dedicated earth on the secondary?
Or do you feed it 110 V in and out, or in your case 220v in and out? 

Thanks
09-05-2012 Post does not mapped to Knowledge Tree
manisandher
London
Posts 158
Joined on 09-05-2008

Post #: 1063
Post ID: 18583
Reply to: 18582
PP and balanced AC
fiogf49gjkf0d
Hi Jorge.
Firstly, be very careful if you're thinking about feeding a PP with a balanced AC input. It may be different with the North American PP units, but my UK unit did not like being fed by a balanced AC input. My balanced transformers already tend to increase the voltage by about 5% ,so I had an output of +115V(regenerated) and -128V(non-regenerated) from the PP (I had the PP set to output 230V). This caused havoc with my DAC especially. My conclusion is that my PP2000 only regenerates the Live input and passes the Neutral input un-regenerated. I'd be interested in anyone's thoughts here.
So, I currently have things set up like this:
house AC (240V) -> PP2000 (set to output 230V)  -> balanced transformer primary (L=230V, N=0V, E=house) -> balanced transformer secondary (L=+115V, N=-115V, E=dedicated rod)
(I would draw a diagram but I'm working away from home and don't have the software on my laptop.)
All AC wiring from secondary is Belden with shields connected at both ends. At the moment, the PP2000 feeds two 5KW balanced transformers. Once the new PP+ comes, I'll have the above setup replicated twice.
I'm no expert, but I think one of the reasons this setup works so well is that the +115V/-115V outputs from the balanced transformer are not connected to E, so the earth remains 'clean'. I know that Romy has misgivings about daisy-chaining anything before or after the PP, but for my part, this is easily the best sound I've managed to get. Oh and I'm not sure if this is important or not - my system is fully balanced too. My understanding is that many studios use balanced AC, and of course use fully balanced setups (though I may be wrong here).
Mani.
09-05-2012 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,656
Joined on 10-12-2006

Post #: 1064
Post ID: 18584
Reply to: 18583
Neutral "Input" and Balanced Systems
fiogf49gjkf0d
Mani, the neutral wire is meant to be "the" system ground, with zero potential, so it should not have any "input".  It is known, however, that many factors conspire to contaminate ground wires (including the neutral wire) with electrical noises, and switching devices in particular are well known to foul their own nests, making any conductors they are on or near noisier.  Given these facts, and barring other issues, then it makes sense that isolation from line noise equals less noise.  Perhaps of interest here, I saw that PP specifically states that they will not accept responsibility for RFI problems, period.

The balanced systems used in "commercial" applications are about controlling hum and noise and tempering impedance/reactive issues over long cable runs.  Additionally, commercial balanced ICs are often biased.

Best regards,
Paul
09-19-2012 Post does not mapped to Knowledge Tree
manisandher
London
Posts 158
Joined on 09-05-2008

Post #: 1065
Post ID: 18631
Reply to: 18581
No comparison
fiogf49gjkf0d
 manisandher wrote:
I'm happy to compare the new PP+3000 to my old PP2000 and share my findings.
So, the PP+3000 arrived... and went pretty much straight back.

As soon as I switched the battery pack on, it started hissing and emitting a God-awful smell. I packed everything up and had it collected the next day. The retailer (Audio Emotion in the UK) told me that the battery pack had suffered a massive trauma during transit - something like a spike going into its underside. I didn't notice anything untoward - although to be fair, I didn't purposefully look at underside of the shipping box or battery supply.

There was one thing that I did do before I packed everything away though. I tried switching the head unit on without the battery pack connected to it. And it worked! Everything displayed correctly, telling me that the battery pack was 'N.C.' Two things that I can report without the battery pack connected:

1) The by-pass switch did not work. Maybe the battery pack is required, although I can't for the life of me understand why this would be the case.

2) I didn't really like the sound. It was weighty and full-bodied, but the delicacy and sparkle that I've become accustomed to with the PP2000 was gone. I would totally accept that actually it might be the PP2000 that's 'at fault' here - injecting some noise or whatever into the regenerated AC -but whatever the PP2000 is doing, it seems to do wonders for the sound. Also, there's obviously the strong possibility that the PP+3000 needs the battery pack to perform optimally. But the fact that it 'works' without one, and really was regenerating the AC (I had 245V going in and 230V coming out) was really confusing for me. I mean, does that battery actually do anything under normal operation? Or does it just kick in when the mains AC drops too low? If it's just the latter, I'd much rather have a battery-less regenerator - it'd be much, much lighter and should be a damn sight less expensive (especially taking shipping costs into account).

Audio Emotion were happy to send me a replacement PP+3000. But based on my initial experience, I declined and asked for a refund. I may well order the PP+3000 again in the future, but won't do this until others in the field have reported their own findings. Apparently, Audio Emotion have shipped >20 other PP+ units with no reported issues whatsoever.

With this post, I may well ruffle the feathers of Audio Emotion and/or PurePower, but quite frankly I'm not casting any judgement on them, just stating my experience.

Mani.
09-19-2012 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,155
Joined on 05-28-2004

Post #: 1066
Post ID: 18632
Reply to: 18631
Congratulations… as usually.
fiogf49gjkf0d

 manisandher wrote:
So, the PP+3000 arrived... and went pretty much straight back.

As soon as I switched the battery pack on, it started hissing and emitting a God-awful smell. I packed everything up and had it collected the next day. The retailer (Audio Emotion in the UK) told me that the battery pack had suffered a massive trauma during transit - something like a spike going into its underside. I didn't notice anything untoward - although to be fair, I didn't purposefully look at underside of the shipping box or battery supply.

There was one thing that I did do before I packed everything away though. I tried switching the head unit on without the battery pack connected to it. And it worked! Everything displayed correctly, telling me that the battery pack was 'N.C.' Two things that I can report without the battery pack connected:

1) The by-pass switch did not work. Maybe the battery pack is required, although I can't for the life of me understand why this would be the case.

2) I didn't really like the sound. It was weighty and full-bodied, but the delicacy and sparkle that I've become accustomed to with the PP2000 was gone. I would totally accept that actually it might be the PP2000 that's 'at fault' here - injecting some noise or whatever into the regenerated AC -but whatever the PP2000 is doing, it seems to do wonders for the sound. Also, there's obviously the strong possibility that the PP+3000 needs the battery pack to perform optimally. But the fact that it 'works' without one, and really was regenerating the AC (I had 245V going in and 230V coming out) was really confusing for me. I mean, does that battery actually do anything under normal operation? Or does it just kick in when the mains AC drops too low? If it's just the latter, I'd much rather have a battery-less regenerator - it'd be much, much lighter and should be a damn sight less expensive (especially taking shipping costs into account).

Audio Emotion were happy to send me a replacement PP+3000. But based on my initial experience, I declined and asked for a refund. I may well order the PP+3000 again in the future, but won't do this until others in the field have reported their own findings. Apparently, Audio Emotion have shipped >20 other PP+ units with no reported issues whatsoever.

With this post, I may well ruffle the feathers of Audio Emotion and/or PurePower, but quite frankly I'm not casting any judgement on them, just stating my experience.
 Mani, thanks for the report. It is sad that your unit was basted, let hope that it is not emblematic for the new PurePower+ and has to do with your specific shipment. Let hope… On another hand - they pick it up and replace it. So, there is no damage….

The fact that the unit was working with no battery is not surprise to me. It is also no surprise that the bypass did not work as to do bypass the unit need very temporary to be switched to battery operation (while the contacts of relay are re-engaged). So, no battery, no bypass.

I would hold the judgment about sound until you have the fully functional units. You see, as PurePower flats the input AC to DC they have very little filtration, I think they use a few hundred microfarads to kill the residual ripples. This is very inadequate amount of capacitance for the huge currants that are flowing in there. The reason why they do it is because they rely upon the huge filtration capacity of the battery. An acid buttery have very low internal impedance and acts as a phenomenal buffers that shunt all pos AC-DC transformation ripples. So, what you used was only God know what and I would not be surprised if it was a very random result.

Frankly I am bit suspicion about you (or your old PP2000 unit) as my and your ether unit or our expectations of performance are different. My PP2000 does not “injecting some noise” and I do feel that if you report it then you unit might be defective.

For sure you have rights to decline trying the new unit but it looks like your dealer do what dealer has to do: send a replacement. If they have sold >20 PP+ units with no reported issues whatsoever then they might (or might not) say truth. I spoke two weeks back with PurePower and they insisted that they have no negative feedback from the fields. Well, I do not think that they would advertise it if they would. Still, if it cost nothing to you and if you initially wanted to try PP3000+ then I do not know how that misfortune you had did changed your mind. 

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-19-2012 Post does not mapped to Knowledge Tree
manisandher
London
Posts 158
Joined on 09-05-2008

Post #: 1067
Post ID: 18633
Reply to: 18632
What really happened to the battery pack?
fiogf49gjkf0d
 Romy the Cat wrote:
... if it cost nothing to you and if you initially wanted to try PP3000+ then I do not know how that misfortune you had did changed your mind.
Well let's just say that I find the retailer's version of events difficult to believe. It would be just amazing if something pierced the (quite hefty) packing material and the metal underside of the power supply casing... and that I just didn't notice any sign of damage at all. OK, I wasn't particularly on the lookout for anything, but I just can't imagine missing something so obvious. My feeling is that the battery was either defective from the off, or was damaged during transit in a less traumatic way than was suggested by the retailer. In either case I'd like to have some assurance of battery resilience before accepting another PP+3000.

But your explanation of its poor performance without the battery connected makes sense. It's good to know that the battery is an integral part of the design even in normal use.

Mani.
09-19-2012 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,155
Joined on 05-28-2004

Post #: 1068
Post ID: 18634
Reply to: 18633
Loch Ness Monster and PurePower.
fiogf49gjkf0d
 manisandher wrote:
Well let's just say that I find the retailer's version of events difficult to believe. It would be just amazing if something pierced the (quite hefty) packing material and the metal underside of the power supply casing... and that I just didn't notice any sign of damage at all. OK, I wasn't particularly on the lookout for anything, but I just can't imagine missing something so obvious. My feeling is that the battery was either defective from the off, or was damaged during transit in a less traumatic way than was suggested by the retailer. In either case I'd like to have some assurance of battery resilience before accepting another PP+3000.
 Yes, I would say that the explanation that retailer gave to you was most likely bogus but their explanation are never make sense and artificially constructed only to maintain face. I do not think you would blame them. It is very unlikely that anything might take place with battery as the use sealed lead batteries that are virtually indestructible. Most likely it was a shunting cap that got shorted – it does happen, particularly with less expensive caps. Alternatively it might be the shortage of cables that map the individual batteries into buttery array. It is hard to say  and I think PP owe you a call back with some explanation.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
11-12-2012 Post does not mapped to Knowledge Tree
SOS
Posts 10
Joined on 11-12-2012

Post #: 1069
Post ID: 18737
Reply to: 18580
PurePower 2000 + troubles !!!!!!
fiogf49gjkf0d

I've had a new PurePower APS 2000+ unit for just over 5 months and recently the battery will not charge. After Damian of PurePowerAPS helped diagnose the problem they said they would do a call pick-up to send back to the factory in Canada for repair. Here is his reply...

Hi Steve,

If you get no voltage reading from the Regenerator unit's Power Pack connector when it is plugged in and the breaker is in the on postion, it will almost certainly be a charger issue or charger interconnect wire contact problem inside the Regenerator unit.

I can supply a prepaid UPS waybill for a return trip and have it checked, corrected, tested, and back out the door in 24 hours. When you receive it you can re-attach the Power Pack and it will fully re-charge the batteries over a 12 hour period.

Let me know if I should use the address information we have on file and when to schedule pickup. If you prefer we can also just send the prepaid waybill to your email and you can either arrange a pickup at your convenience or drop the package off at any UPS location.

Thanks,
Damian.

So this was late October and ever since PP now does not return emails or phone calls. Very disappointed in how they treat customers and would made sure everyone knows before buying a PP unit from Canada. Maybe they are out of business but I had many emails back and forth until it was ready to be shipped back for repair then nothing.

If this situation changes I will post an update.

Steve
SOS

11-12-2012 Post does not mapped to Knowledge Tree
PurePower
Ayr, ON
Posts 44
Joined on 05-26-2009

Post #: 1070
Post ID: 18738
Reply to: 18737
PurePower repair
fiogf49gjkf0d
Hi Steve,
This seems like a pretty simple problem. I'd be happy to straighten it out.
It only takes a day to repair a PurePower+ 2000 and in your case it only takes UPS a day and about $19 to ship from your home to our pickup depot in Niagara Falls NY. It seems Damian promised you a prepaid waybill for the shipment - not our actual policy but he was trying to be helpful and save you a few dollars. The person at PurePower responsible to email you the waybill failed to get the message. 
However, that shouldn't cost a month of waiting. If I knew about your problem it would take about 90 seconds to resolve. In fact that's exactly how long it took me to do it. I have emailed you a UPS return waybill. Please use the waybill, return the unit and we'll be very happy to fix it fast and return it.


 
01-12-2013 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,656
Joined on 10-12-2006

Post #: 1071
Post ID: 18876
Reply to: 18738
Hope for the Hopeless?
fiogf49gjkf0d
Magnets "pulling" the noise to ground???

https://coreaudiotechnology.com/products/power-supplies/kolossus-grounding-system

If only!

Paul S



PS: Any updates from users/sufferers on the "new", lighter/cheaper-to-ship APS stuff?  Mani?
01-12-2013 Post does not mapped to Knowledge Tree
Bud
upper left crust united snakes
Posts 87
Joined on 07-07-2005

Post #: 1072
Post ID: 18878
Reply to: 18876
OMG
fiogf49gjkf0d
What happens at year 100 & day 1? Can we get our money back if the magnets explode
from the machined aluminum, RFI wrapped, tar filled box before year 100?

Bud
01-12-2013 Post does not mapped to Knowledge Tree
SOS
Posts 10
Joined on 11-12-2012

Post #: 1073
Post ID: 18879
Reply to: 18878
PP 2000 +
fiogf49gjkf0d
Well my PP 2000 + has gone back twice and currently I have it but can not use it due to a grounding issue only with analog. The guys at PP are trying to figure this all out but no answers to date. It is dead quite with digital but I don't listen to digital so I feel I have a $3500 boat anchor at the moment. Will wait a few weeks more and hope they can figure this out.What is really strange was when I first had the unit initially all was great with analog. Will keep all posted.
01-13-2013 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,155
Joined on 05-28-2004

Post #: 1074
Post ID: 18880
Reply to: 18879
It sounds like it is your problem.
fiogf49gjkf0d
 
 SOS wrote:
Well my PP 2000 + has gone back twice and currently I have it but can not use it due to a grounding issue only with analog. The guys at PP are trying to figure this all out but no answers to date. It is dead quite with digital but I don't listen to digital so I feel I have a $3500 boat anchor at the moment. Will wait a few weeks more and hope they can figure this out.What is really strange was when I first had the unit initially all was great with analog. Will keep all posted.

Hmmmm, frankly I do not feel that it is the problem of the PP’s guys.

If you have a grounding issue only with analog then it is your problem and I do not think how you can hold the company and the product responsible to address it. Of cause I could be mistaken and the new PP 2000+ does have some grounding issues but I feel it is highly highly unlikely. The PP 2000 as any other power devise would require to fine own grounding solution. If you have some kind of ground loop than it is a specific of your playback and PP 2000 shall not be blamed. If you provide specific information about the nature of your problem with analog than I might advise something. Some very simple tests would help identify the problem very fast.

BTW,  how does the unit sound in context of your system. The pain you going to accommodate the PP 2000 + does suggest that you find it worth to use in playback? Can you provide more details about the PP2000+’s contribution to Sound?

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
01-13-2013 Post does not mapped to Knowledge Tree
SOS
Posts 10
Joined on 11-12-2012

Post #: 1075
Post ID: 18883
Reply to: 18880
PP+ issue
fiogf49gjkf0d
First as stated before, when I 1st received the unit no hum issue it was after it was sent back twice that it came about. 2nd if I use my other conditioner, a Purist Audio Design all is dead quite. The humming out of the speakers stops if you plug the turntable motor into the wall directly or into the PAD conditioner, same with the phono stage. Plug either or both into the PP+ and the hum comes back. I've tried cheater plugs on each and every componen, no difference. I've tried grounding wires from chassis...no difference. There's also another customer that is having the same issue with his new PP+. He has an original PP unit and no hum so I think it's safe to say it is the PP + unit(s).
Suggestions????????????????????
01-13-2013 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,155
Joined on 05-28-2004

Post #: 1076
Post ID: 18884
Reply to: 18883
I think it is purely your issue.
fiogf49gjkf0d
 SOS wrote:
First as stated before, when I 1st received the unit no hum issue it was after it was sent back twice that it came about. 2nd if I use my other conditioner, a Purist Audio Design all is dead quite. The humming out of the speakers stops if you plug the turntable motor into the wall directly or into the PAD conditioner, same with the phono stage. Plug either or both into the PP+ and the hum comes back. I've tried cheater plugs on each and every componen, no difference. I've tried grounding wires from chassis...no difference. There's also another customer that is having the same issue with his new PP+. He has an original PP unit and no hum so I think it's safe to say it is the PP + unit(s).
Suggestions????????????????????

Sorry, this sounds like purely your issue. Any power devise has own impact to the rest of the system. You do admit that it is hum, I presume 60 of 120 cycles. So, it is poorly the loop issues and the loop in your system. Experiment with lifting the grounds, with ground patches and etc. You have isolated your turntable motor reason the rest is very simple. I think you could blame PP if they disconnect ground at the unit output but I do not think that they did it.  BTW, what is the problem to have turntable motor plugged into the wall? I have my TT motor in the wall for years. Just do not let the motor body to touch anything and you shall be all set.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
01-13-2013 Post does not mapped to Knowledge Tree
SOS
Posts 10
Joined on 11-12-2012

Post #: 1077
Post ID: 18885
Reply to: 18884
Not my problem.
fiogf49gjkf0d
I've tried even placing a cheater plug on the PP+ unit and still get the hum. Why can everything be plugged into another conditioner or everything into the wall and all is dead quite BUT plug either the phono stage and or the TT motor into the PP+ unit and a hum begins. Grounding the TT and or motor back to a common ground does not help. Only thing that stops hum is not having either of these devices plugged into the PP+.
01-13-2013 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,155
Joined on 05-28-2004

Post #: 1078
Post ID: 18886
Reply to: 18885
Keep working on it, it is not PP problem.
fiogf49gjkf0d
 SOS wrote:
I've tried even placing a cheater plug on the PP+ unit and still get the hum. Why can everything be plugged into another conditioner or everything into the wall and all is dead quite BUT plug either the phono stage and or the TT motor into the PP+ unit and a hum begins. Grounding the TT and or motor back to a common ground does not help. Only thing that stops hum is not having either of these devices plugged into the PP+.

SOS, this is emblematic ground loop scenario. I am surprised that ask why it does not take place with another devise. This is how the thing usually works. If you have 5 different step up transformer, or 5 deferent phono cables then it will be very probably that each of them or some of them would require different grounding schema, despite the all are made in the same ways. I am a bit surprised also that if you were placing a cheater plug on the PP then you have the hum. The presents of hum with lifted PP output is unambiguous indication that something in your installation is not kosher. I presume that it is on digital domain and people frequently forget that digital and analog have different loops to ground. Do not forget your computer, monitor and network switches.  It is very easy to connect just analog and to see if you have the noise.  Then add one element a time with lifted ground. It is not really hard to find the problem.

You need to understand that your claim to PP company will not be warranted, all that they can do it confirm that they did not lift ground from input and output. There is absolutely nothing in such unit as PP is that might be responsible for hum in your system. If I was PP owner I would discard your complain it might not be expected for my company to debug the ground loop on the fields. I am not in the business to advocate PP but in this specific case I think you ask them to much. If you completely at lost with this then I do not mind to help you with it. I am assuring with 99.999% certainty that there is a solution and the solution is outside the PP.

Rgs,
Romy The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
01-13-2013 Post does not mapped to Knowledge Tree
Bud
upper left crust united snakes
Posts 87
Joined on 07-07-2005

Post #: 1079
Post ID: 18889
Reply to: 18886
Ground is hard
fiogf49gjkf0d
SOS, please note that your PP 2000 does not isolate one component from another within the reconstituted 60 Hz circuit. It only isolates those components from the noisy and variable wall voltage. Since you think you must isolate your TT and phono stage from the wall mess, and I think you should also, do yourself a favor and purchase an APC 600, one of the light tan models, not the noisy, smelly onyx models. Do not run it from the PP 2000 , run it from the wall. The PP 2000 will then shelter your other components from this newest insult also. I will be interested to know if this new APC also provides hum. If it does you must isolate the phono stage from the motor of the TT with yet another APC unit, or just plug your TT into the wall. If you also have a computer controlled music server for digital content the computer power supply should not be in the PP2000 isolated circuit, these are very dirty power supplies and will defeat what you are attempting to accomplish.

Bud


01-13-2013 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,155
Joined on 05-28-2004

Post #: 1080
Post ID: 18890
Reply to: 18889
A few things.
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 Bud wrote:
… do yourself a favor and purchase an APC 600, one of the light tan models, not the noisy, smelly onyx models. Do not run it from the PP 2000 , run it from the wall. The PP 2000 will then shelter your other components from this newest insult also. I will be interested to know if this new APC also provides hum.
A few things I would like to note in context of the post above. You need to be VERY careful connecting the switching power supply in series as it significantly drops power handling. Second, neither PP 2000 or APC 600 provide ground loop hum, it is imposable by definition. Third, what is the need for additional powering of TT’s motor. The TT motors all have power stabilizer in there and they run from let say 5-12V. Yes, I know – there are people who feel that special powering of TT motors does make difference – I find it is a controversial observation.  The last one – the APC 600 is line-Interactive unit not the double conversion unit. Those units produce truly garbage voltage, good only to power irrigation systems. It is very unlikely that it give any benefit and it certainly not the tool do break ground loops.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
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