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Old 13th December 2007, 09:50 AM   #1
gio_b is offline gio_b  Italy
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Default exposure XXI

hi,can anybody help me?
is possible and easy,convert an aexposure XXI from 125 volts to 220 volts?
my i do it my self?
thanks at all.
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Old 13th December 2007, 10:55 AM   #2
ppa is offline ppa  Italy
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First all I must tell that the voltages in the transformer and around it are lethal and must be done attention in all operations.


Yes, if It's possible to find a tranformer (toroidal I suppose) with:

- same power (or higher)

- same number of secondaries and same voltages output rated at 230 Vac input (to primary)

- compatible dimensions to the original.

The problem is having these informations.
I council you to contact Exsposure for the 230Vac replacement transformer, I suppose that It's possible to do it.
The direct inspection by tester is problematic because the italian Vac voltage is 230 not 110-120 Vac and connecting the amp to 230 Vac it's very dangerous (be carefull).
A solution can be is finding the schematics or connecting the amp to an AC adaptator from 230Vac to 110 Vac (be carefull to max power rated) and testing the secondaries , before all it's necessary to disconnect the secondaries from rectifier(s).
It's possible to use an sin generator (function generator) for tested but this a secondary way.
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Old 13th December 2007, 11:07 AM   #3
gio_b is offline gio_b  Italy
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is not allowed to move 4 wires inside:from serial to parallel?
many tranformer are both for 125/220 just rewired in this way.
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Old 13th December 2007, 02:07 PM   #4
ppa is offline ppa  Italy
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Many but not all, several transformers are made for one AC voltage supply only and they have one primary only.
I think if amp's transformer had two primaries then exsposure would have placed an AC selector inside amp.

However, I think this transformer probabily is a standard type and It's possible (but this it's not probabily) that on it there is a label with secondaries voltages and rated power.




For the forum's rules I must tell you that you can operate inside amp only if you are competent in electronics. Prudence always.
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Old 13th December 2007, 02:18 PM   #5
ppa is offline ppa  Italy
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can you send me some photos inside the preamp, please?
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Old 13th December 2007, 02:35 PM   #6
gio_b is offline gio_b  Italy
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i'm watching an ebay item,and the seller don't send me the photos,so...
many thanks anyway for your interest.
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Old 13th December 2007, 02:39 PM   #7
AndrewT is offline AndrewT  Scotland
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Hi,
Exposure is made in the EC and either has a 230Vac or a dual 115/230Vac transformer fitted as standard.
It is very easy (if it's not a Krell) to change voltage to suit any country.
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Old 13th December 2007, 02:44 PM   #8
gio_b is offline gio_b  Italy
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so if i get the item can help me?
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Old 13th December 2007, 02:52 PM   #9
ppa is offline ppa  Italy
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Now I have find some preamp's photos and this preamp is an120/240 ac model , AndrewT you are right ,
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Old 13th December 2007, 02:57 PM   #10
ppa is offline ppa  Italy
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If you want I can help I think , now I go just to listen my new preamp that I have designed (we are speaking about preamps....).
See you later guys.
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