Hi Keisei,
The TP-2 transformer manufactured by Stancor was used in the earliest Alembic power supplies. This was an industrial (or control) transformer intended only for 117 VAC power on the primary. There were several taps that made it possible to use the same transformer for different secondary voltages, but not for 220-240 VAC power. We cut off the unused taps during construction of the DS5 power supply, as they should never be used for powering Alembic instruments.
For many years we've had a custom transformer wound with 4 wires, constructed with two primary windings. For 117 the windings are connected in parallel, and for 220-240 the windings are connected in series, as in the other posting. This transformer has the Alembic part number 560-005, and it's mounting holes and other dimensions are the same as the Stancor TP-2.
So unfortuantely there is no way to reconfigure the TP-2 for German power. The 560-005 transformer is used in all the newer DS-5 power supplies (and the newest models have both a detachable power cord and a voltage selector switch, so the correct power plug can be attached, and the voltage selected without rewiring inside.
If you can find a local transformer with a primary that accepts 220-240 VAC and a secondary winding provides 30 VAC with center tap,
you can substitute that for the TP-2. The secondary voltage can be as low as 24 VAC and up to 31 VAC and provide good operation (24 VAC was a popular voltage used in industrial controls and may be easier to find than 30 VAC).
-ron
ps. A concern is that the small two-leaded device in series with one wire of the transformer is a thermal cut-off, and is usually destroyed if soldered (the original wiring used twist-on connections called "Wire Nuts"). Also the case of the thermal protector is hot so it is necessary to use the fiberglass/silicon tubing to insulate the protector from contact with the chassis. The current DS-5 power supplies use a small fuse instead of the thermal protector.
