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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Powerware 5115 UPS boxesPosted by peter foster on: 12/4/2007
Dear Romy,
I do not know who uses the PowerStation75 so I cannot say whether it is helpful. I use the Powerware 5115 UPS boxes for managing the mains power supply [details on www.nps.com.au under Products and Line Interactive UPS (Corporate)]. This model does not require a fan so it is silent. Each UPS box uses its own dedicated branch circuit for its mains power supply. We are supposed to be supplied with mains power supply of a nominal 240v 50Hz but there is a lot of fluctuation. Also we live in a semi-rural area so not many hair dryers operating nearby and we do not have nuclear power stations on the grid. I have six of these UPS boxes for my sound system components with each box supplying 3 outputs (18 outputs in total). The 2 metre power cables were all supplied by UPS as well and they are industrial quality but inexpensive. I also have an amplifier that has custom hand wound E&I transformers which are over-engineered for the amplifier. Sometimes, even with the use of the UPS boxes the mains power supply is so poor that the fixed bias points on each of the eight KT90EH output tubes can measure around .49V dc instead of an optimum .70V dc. Even then, I do not detect change in the sound of the system up to 105db at one metre. I do not know if the sound would change above that level because it would be unhealthy level. I am satisfied with this setup.
Regards, Peter Foster.Rerurn to Romy the Cat's Site