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Topaz ultra isolation transformer 5KVA 91005-11
Topaz isolation transformer. 5 kva, 0.005 pF. Like new, minor scuffs. It has a 10 foot AWG #10 cord with 125/250 30 amp twist-lock Hubell plugs. The plugs are brand new. It is wired for 240 volts but can be wired for 120 volt input and output by moving the jumpers and wiring around. I had plans to use this transformer to power my home theater. This unit is in mint working condition and if you want to attenuate transients and noise that originate on the incoming power lines you should consider trying this ultra isolation transformer like this one. With 5 kva you can power a studio. It was stored in my basement for over 10 years. The minor scuffs come from moving it around, its 100 lbs with the cords. Excellent condition. I will change the voltage to 120 volts input and output and change plug and receptacle for you if you want it. The receptacles can be 120 volt 20 amp hospital grade. I will give you two duplex hospital grade 20 amp receptacles if you want to convert to 120volts. Can lengthen cords at extra cost. Any questions feel free to ask. Can help you with your installation.
Input: 120v / 240v, 50 / 60 Hz Primary to secondary capacitance is .005 pF
Dimensions: 15" x 7-1/2" x 7"H
I use an isolation transformer at meets because there is more than likely a lot of noise and hash on the power lines from all the other gear in use, particularly anything with a microprocessor.
I see a couple purposes for using an isolation transformer:
1. As Uncle Erik mentioned, it blocks any DC on the AC power line from getting into your components' power transformers which will affect their magnetic behavior with possible saturation.
2. The very low capacitance type do a good job of filtering high frequency noise on the AC mains from entering your components.
However, an isolation transformer does not address the conducted noise generated by each component dumped back up the AC line and into the adjacent component. Perhaps we should use 1 transformer for digital components and 1 for analog/amplifiers.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing." - Daniel R. von Recklinghausen, former Chief Research Engineer, H.H. Scott
A little late to the party, but hopefully relevant. Many, many years ago I started using the Topaz Isolation devices. I was using these in our computer audio lab at a large chip manufacturer (the big one). We had put together a rather large Audio Lab for CD authoring, testing sound cards for PCs, complete with the AP audio analyzer, etc. The effect of the isolation transformer was unquestionable on the effects of audio. Measuring the THD of the incoming power showed significant improvement. The noise floor was significantly improved as well.
I currently use two Topaz isolation transformers in series.
I've never looked back, and ultimately went balanced.
Balanced Power Technologies - Home
Equi=Tech Corporation Home Page
EDIT: I have two Topaz isolation transformers (a 1.8KVA and a 1.1KVA) in series on my simpleton AV system, where the effect on the picture is plainly evident.
EDIT: My review of Donald's DNA Sonett probably reflects the effect of the use of the BPT. I wouldn't use it without it!
Last edited by Rdr. Seraphim; 09-12-2009 at 01:39 AM. Reason: Clarification
BTW, I think any isolation transformer is a good entry point into power conditioning. Some of these are inexpensive, but the results are positively audible.
Topaz Ultra Isolation Transformer
Topaz ultra isolation transformer. 5 kva, 50 / 60 Hz, 0.005 pF isolation. Used.
Dimensions: 7-5/8" x 14-3/4" x 6-1/2"H
MGE Topaz ultra isolation transformer. 5 kva, 0.005 pF, 50/60 Hz, 0.005 pF isolation. Input cord: 10-3 AWG x 10 foot long with twist lock plug. Output cord: 10-3 AWG x 1 foot long with twist lock receptacle. Used, but clean.
Input / Output: 120 / 240 vac
Dimensions: 7-1/2" x 15-1/4" x 6-3/8"H
