exposure XXI

[gio_b]

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.

[ppa]

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.

[gio_b]

is not allowed to move 4 wires inside:from serial to parallel?
many tranformer are both for 125/220 just rewired in this way.

[ppa]

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.

[ppa]

can you send me some photos inside the preamp, please?

[gio_b]

i'm watching an ebay item,and the seller don't send me the photos,so...
many thanks anyway for your interest.

[AndrewT]

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.

[gio_b]

so if i get the item can help me?

[ppa]

Now I have find some preamp's photos and this preamp is an120/240 ac model , AndrewT you are right ,

[ppa]

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.