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Energy EW-100 Subwoofer transformer
Energy EW-100 Subwoofer transformer
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Old 16th December 2012, 05:16 AM   #1
argonrepublic is offline argonrepublic  Canada
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Join Date: Apr 2005
Location: Simcoe Ont
Default Energy EW-100 Subwoofer transformer

I have a dead powered sub. The transformer is stamped
042-010078-000ZR. I have no idea what I need to repair or how to determine a value for replacement. Does anybody have a schematic? Can I repair this. There appears to be continuity in the primaries but no output. The amp is said to have 225 Watts secondaries are center tapped.
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Old 16th December 2012, 06:06 AM   #2
Richard Ellis is offline Richard Ellis  Argentina
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Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Look thruout the inside of the unit, use a decent magnifying glass...look very closely ... take lots of pictures, close-ups ...post them here.Someone might have seen such an amp. Sometimes the amp section will have voltages written on the PCB coming in from the PS....EG. +35V -35V
It is a starting point at least...Klipsch will want to repair it for you of course$$...and surely wont tell you the specs on the transformer..nor is their likely a schematic easily available.

__________________________________________________ __________Rick...
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Old 24th January 2013, 01:42 PM   #3
Obrien is offline Obrien  United States
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Default Energy EW-100 Subwoofer Transformer

did you ever find about the transformer voltages, etc? I have a Klipsch that has the exact same problem... an open winding in the power transformer.
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Old 23rd April 2015, 04:31 PM   #4
Hazardsneon is offline Hazardsneon
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Join Date: Mar 2010
This post is very old, but I picked up the same sub on craigslist with issues and in my searches I came across this post.

I was unfortunate to find that the person that tried to fix it didn't know about the thermal fuse and, when prying at it, broke some turns on the transformer.

So, I hooked up my 4ohm load gave it a 1Vp-p sine wave on the input, injected +/- Voltage and increased until the output didn't clip. (I simplified this greatly).

Long story short, I found that a 48V 100VA center tapped transformer is needed to power this guy. Or this is at least what should be used to get the proper output.

Now I am on my search for an inexpensive transformer to suit the needs.
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Old 26th April 2016, 10:11 PM   #5
Hazardsneon is offline Hazardsneon
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Join Date: Mar 2010
Just to update. I purchased a Hammond 186F48, a 48V CT 100VA, transformer a while ago and hooked it up but killed my amp right away.

I shelved it for a while until recently I found a couple bad transistors in the standby circuitry. I replaced those, hooked my transformer back up, and it is now capable of putting out enough voltage for 110W at no load. However, under a 4 ohm load the supply dips, the output clips and it is able to put out around 68W.

I consider this a win and say that this transformer is a worthy replacement. I needed to make an adapter plate so it fastened to the same holes but it looks more beefy and I think it will last longer.
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