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Old 28th April 2013, 11:37 AM   #1
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Default Convert Aleph 30 from 120v to 240v

I need to convert an Aleph 30 from 120v to 240v. It looks like I need to change the 2 windings of the primary of the mains transformer from parallel to series and change F1 to 2 amps. Is this all I need to do? Any help is appreciated.
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Old 28th April 2013, 01:30 PM   #2
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exactly as you wrote
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Old 28th April 2013, 11:31 PM   #3
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Just make certain you wire the two primaries in series and IN PHASE.
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Old 28th April 2013, 11:50 PM   #4
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nothing wrong if he wires them series - antiphase

amp would be just Dodo

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Old 29th April 2013, 03:53 AM   #5
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Quote:
Originally Posted by Headboy99 View Post
I need to convert an Aleph 30 from 120v to 240v. It looks like I need to change the 2 windings of the primary of the mains transformer from parallel to series and change F1 to 2 amps. Is this all I need to do? Any help is appreciated.
Just use 4 car batteries in series, problems solved, no ripple.
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Old 29th April 2013, 09:42 AM   #6
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Quote:
Originally Posted by Headboy99 View Post
I need to convert an Aleph 30 from 120v to 240v. It looks like I need to change the 2 windings of the primary of the mains transformer from parallel to series and change F1 to 2 amps. Is this all I need to do? Any help is appreciated.
Hi this is from a old service manual I had on my drive & may be useful. Note that this from a Aleph 60 manual. I would try first to x-ref the wiring shown here versus what you have as stock to make sure these are relevant to your amp. Cheers,
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Old 29th April 2013, 10:04 AM   #7
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Originally Posted by Zen Mod View Post
nothing wrong if he wires them series - antiphase

amp would be just Dodo

Hi Zen Mod, is "just Dodo" a good or a bad thing? If the amp will be as dead as a Dodo, that's bad ...
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Old 29th April 2013, 10:29 AM   #8
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naah

nothing wrong or damaging will happen

say that you have two primary windings ;

they're A-A' and B-B'

now they're connected (A+B)-(A'+B')

connect them to have A and B' as mains input , with shorting bridge between A' and B

translate your color scheme of wires to that nomenclature and everything is clear

as illustration :
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File Type: jpg xformer phasing.JPG (73.9 KB, 133 views)
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Old 1st May 2013, 02:39 PM   #9
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Hi Zen Mod, is "just Dodo" a good or a bad thing? If the amp will be as dead as a Dodo, that's bad ...
Yep..... anti-phase (also known as "bucking primaries") = Dodo = no output from the transformer..... it won't damage the transfo or the amp, but it sure won't work, either......
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Old 10th May 2013, 01:08 PM   #10
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Well the amp has arrived so I'm trying to do the conversion to 240v. Referring to the image, I removed the link from L1 to 3, removed the link from L2 to 1, and added a link from 1 to 3.

The resistance on L1-L2 measured about 17 ohms before conversion, and about 34 ohms after. To be safe I disconnected the power feeds to the amp boards. I put in what I think was a 2 amp slow blow fuse (a spring at one end) and there was a flash at one of the secondary winding connections to the board and the fuse blew.

I set everything back the way it was and connected up with an external 240-120v stepdown transformer and everything is working fine, so it may only have been that the fuse wasn't a slow blow.

Please could someone comment on if my rewiring suggestion looks correct?
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