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Old 5th April 2012, 11:34 AM   #11
AndrewT is offline AndrewT  Scotland
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He could feed 110/120Vac into the 240Vac Primary without any danger to the transformer nor him/herself.
Measure all the AC voltages.
Then scale them up as if fed from 240Vac.
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Old 5th April 2012, 11:36 AM   #12
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Yep.

We don't yet know his level of experience so I'm keeping matters as simple as possible.
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Old 5th April 2012, 11:51 AM   #13
AndrewT is offline AndrewT  Scotland
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Wiring up a 120Vac supply via an insulated terminal block to a 240Vac transformer is simple.

Wiring a 120Vac supply via a 115:230 autoformer and feeding that 230Vac output via a terminal block to the 240Vac transformer, has much added complexity.

I would rather he was advised in the simplest way possible that minimises as many risks as possible.
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Last edited by AndrewT; 5th April 2012 at 11:57 AM.
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Old 5th April 2012, 11:57 AM   #14
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I'm sure he will get the message from our posts.

I agree with you. It's a simple task of connecting the 240V transformer up to 110V and then calculating the relative voltages.

Lets see what he comes back with - if he understands then no problem. If he doesn't then we might need to help him along a bit.
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Old 5th April 2012, 12:25 PM   #15
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Just doing a bit of hunting on the Internet for this product.

There is a guy that solely deals with the manufacturer, he might be able to help outwith the DIY approach.

He wasn't impressed with it so he might help you.

http://www.stereo-now.co.uk

As I'm in the UK I've asked him for any help that the company might be able to provide, you never know, they might release the technical information or a 110V spare to a fellow brit.

I'll keep you posted.
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Last edited by KatieandDad; 5th April 2012 at 12:34 PM.
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Old 8th April 2012, 05:32 PM   #16
tsibbs is offline tsibbs  Canada
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Thank you very much for all the information.

Sorry for the long delay (I'm new to the forum and, while I received email notifications when the first responses came in, after my second post they ceased, so I thought the thread went dead. Very glad this is not the case).

As I am very new to electronics please excuse my ignorance.

From what I understand, in order to know which transformer to choose to replace the existing one I need to ascertain the AC voltages of the secondaries.

This cannot be done while the transformer is connected to the amp, so I should remove the transformer from the preamp and connect it to either the 120V mains supply or to the 220V output of the autoformer through an insulated terminal block and use a multimeter to measure the voltages in the secondaries. Correct?

Unfortunately, as it is Easter, I will have to wait a few days to pick up a DVM and a block, but will keep you posted.

Thanks again,
Tim
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Old 8th April 2012, 05:39 PM   #17
AndrewT is offline AndrewT  Scotland
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if you have no suitable tools and the knowledge on how to use them, then forget the project and choose another hobby.
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Old 8th April 2012, 06:18 PM   #18
tsibbs is offline tsibbs  Canada
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Removing some of the outer insulating plastic, I get the following picture:
Photo Album - Imgur

The red, white, and blue wires come out over the top of the transformer, the black, grey, and yellow wires from the side, and the two orange wires come out from inbetween the two groups.
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