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Old 28th July 2008, 06:06 AM   #1
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Default Output transformer Question

The amp is a Leak(British company)Amplifier from about 1960.See Schematic.I am restoring this but when I measured the output resistance this is the readings I got.First don't the reading seem low for a output transformer and second,why is the center tap not equally resistance from the ends. I thought at first that the output transformers were bad but they are both identical.Why is't the center tap in the middle of the transformer?
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Old 28th July 2008, 06:12 AM   #2
Tweeker is offline Tweeker  United States
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On a cheaper (less interleaved) transformer, it can simply be because the turns get longer as you get further from the core. Each side has the same number of turns, but the ones further from the bobbin are longer and thus have higher resistance.

I do not see a schematic.
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Old 28th July 2008, 06:16 AM   #3
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I can't seem to upload the schematic. So you are saying that the coil is really tapped in the middle? Also isn't 100 ohms low for an output transformer.
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Old 28th July 2008, 06:19 AM   #4
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I try again with schematicClick the image to open in full size.
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Old 28th July 2008, 06:20 AM   #5
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Old 28th July 2008, 06:29 AM   #6
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[IMG]http://[/IMG] I,m trying to upload from my computer
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File Type: jpg leak stereo 50 schematic 001.jpg (40.2 KB, 394 views)
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Old 28th July 2008, 06:32 AM   #7
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hope its here now its saying the schematic is too big.
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Old 28th July 2008, 06:49 AM   #8
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The transformer seems perfect.
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Old 28th July 2008, 06:51 AM   #9
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OK thanks
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Old 2nd August 2008, 02:34 PM   #10
ocha is offline ocha  Viet Nam
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Default I have a pair of OPT but I have no clue...

I have a pair of OPT (picture)


I have some questions:

-Which tube can be used with this OPT?
-How to use this OPT with SE and PP?
Please give me some schematics (if possible)

Thanks a lot.

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