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Old 28th April 2007, 04:43 PM   #1
dclapp is offline dclapp  United States
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Join Date: Apr 2006
Location: New Orleans, LA
Question Help identifying transformer?


This is my first post, so please be kind!

I've attached an image of a transformer I took from a '80's Pioneer SX-50 stereo receiver.

I'd like to use this for a chip-amp power supply. But I don't have a clue about "what it is" in terms of which lead does what and what the power (VA or whatever) is.

I wrote to the manufacturer in Malaysia, but never heard back.

Can anyone here help me with this? And...would it be a good choice for a homebrew power supply?

Thanks in advance!

Doug Clapp
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Old 28th April 2007, 06:58 PM   #2
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If working and still installed in the original Pioneer chassis, then CareFully measure the AC voltage on the trio of connections (background of the picture). My best guess: primary winding (pair) is in the foreground of the picture, secondary winding trio ~/0/~ (center tap & two output windings) is in back ...

Also, what is the size of the fuse/breaker in the old Pioneer chassis? This will give you a clue as to the total Volt/Amp (VA) of the transformer. [Example: 3 amp fuse = 120 VAC X 3 = 360 VA divided by 0.6 (60%) = safe bet as to usable power (volt/amp VA)] ... another clue to this is of course the power rating (watts per channel) of the Pioneer ...

Total less than 25 watts = good resource for op-amp / pre-amp circuit power ... 50 watts of more = good resource for chip-amp / power amp ... in between, might be used for tube pre-amp or even smaller tube power amp .... maybe.
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Old 2nd May 2007, 01:28 AM   #3
Leolabs is offline Leolabs  Malaysia
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Bando,great quality!!!!!!!!!!
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