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ID help - is this is a 110v or 220v transformer
ID help - is this is a 110v or 220v transformer
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Old 3rd September 2016, 09:13 AM   #1
frangus is offline frangus  Australia
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Default ID help - is this is a 110v or 220v transformer

I ordered a 220v tube amp but the transformer says 110v. See pic attached.

Im hoping its dual 110v

110v x 2 = 220v?

Thanks
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Old 3rd September 2016, 09:17 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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It is a dual 110V or 220V transformer dependant on how you wire the primaries. Series = 220V and parallel = 110V.
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Old 3rd September 2016, 09:24 AM   #3
frangus is offline frangus  Australia
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Many thanks Jon.

So is it safe to plug in? Or is there still a chance it could be wired for 110v?
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Old 3rd September 2016, 09:29 AM   #4
frangus is offline frangus  Australia
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Does this photo help?
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Old 3rd September 2016, 09:45 AM   #5
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Looking at the first photo it looks as if the red wires are connected together as the black wires are. Make sure the primaries are wired in series, ie; red live, black of that winding connect to the red of the other 110V winding , insulate the connection and connect the black from that winding to neutral.
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Old 3rd September 2016, 10:02 AM   #6
frangus is offline frangus  Australia
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It looks like one set of windings go the power input plug. The second set go to a switch. I dont really understand how this works? Would there be any other photos that would help or can i check with a multimeter?
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Old 3rd September 2016, 10:04 AM   #7
subbu68 is offline subbu68  India
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From second photo, where are those blue wires leading to? They look like wired up for 220V already.
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Old 3rd September 2016, 10:14 AM   #8
frangus is offline frangus  Australia
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The blue wires connect to one pair of the primaries. They are wired to the switch.

The other pairs of primaries are wires to the power input

Hopefully these extra photos help. I have pulled up the pair that goes to the switch for clarity
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Old 3rd September 2016, 10:22 AM   #9
DF96 is offline DF96  England
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You need a meter (to check that they got it right) and a lamp limiter (in case you get it wrong). We can't tell 100% from pictures.
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Old 3rd September 2016, 11:37 AM   #10
subbu68 is offline subbu68  India
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It does not seem to be logical to wire one winding to the switch and the other to the socket. Are you sure it is a power switch?
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