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110/220V Taps (Long)

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Hi, I have a Metaxas Preamp that I am sending to Paris and need to tap the transformer for 220V. It has a seperate power supply and when I opened it there are two bundles of wires for the primary each consisting of a Black, Brown and Orange wire. As it is wired now for 110v it uses the Black and Brown on one bundle. When I measured the resistance it showed 7.6 Ohms. I was told that the 220v taps should measure almost double as they will be in series. I measured the Black and Brown from the other bundle and it also measured 7.6 Ohms. The Black and the Orange from the non used bundle measured 9.4 Ohms, the Brown and Orange on this bundle measured 2.1 Ohms. Would the 9.4 Ohm measurement be the 220v tap? I have a Variac but it only goes to 140v. Is there anything else I can do to verify I have the right taps. Thanks in advance.
Ron

Follow Ups:

Only sure way is to contact the manufacture. Or get a hold of a schematic - jea48 20:57:41 10/23/10 (0)
Some power transformer primaries are multi tap. Starts with a common, (one end of the winding), with taps along the winding to the far other end,(most turns). The far other end being for the highest input voltage.
Closest tap from common the lowest input voltage. The transformer could be wound and tapped for 100V, 120V, 220V, 240V...... ???.
RE: 110/220V Taps (Long) - Tweekeng 10:48:38 10/23/10 (2)
My first guess would be to series the two black and brown bundles.

That is connect the brown from bundle 1 to the black of bundle 2.

Then apply power to black (1) and Brown (2)
- RE: 110/220V Taps (Long) - Ron944 11:28:11 10/23/10 (1)
  This is what I did. When I measured it it showed 15.6 Ohms or twice what is was when wired for 110v.
  - Yes. I would assume then it is correct. but you need to check it BEFORE you plug it into 220volts. Just sayin' - Elizabeth 13:34:29 05/21/11 (0)
    .

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