19" Twin PSU for two RFT Neumann tube microphones from Gefell UM57, CMV562, CMV563, M582
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The Powertechnik Tubelife-2 is a 19" PSU supplying two RFT Neumann mics from Gefell, especially the types UM57, CMV562, CMV563 and M582. Its directly successor is the Tubelife-257.
All voltages are electronically stabilized and filtered in order to optimize the residual noise level. Each channel can be switched on separately monitored by individual LED's. In the regulation of heating voltage a soft start circuit avoids the cold electric push and thus extends the life of the tubes of microphones. The full voltage will be reached after approximately 10s.
At the rear side of PSU the Inputs as 6-pin XLR female sockets are built-in. The Outputs are standard 3-pin XLR male sockets. The symmetrical audio voltages of the microphones are directly connected to the XLR Outs of the PSU.
At the rotatory switches on the front side the polarization between cardioid, omni and figure-eight can be selected. The selection is made through the polarization voltages at the pins 6 of Input connectors. If the used mics are not switchable, their characteristics will remain, independently from the switch positions of the power supply unit.
Connectors of Tubelife-2
Different versions are available for 230V and 110V. It's possible to change the mains voltage with internal solders bridges, but it can only be done by an authorized service center. Also the mains fuse must be changed.
| Suitable microphones | UM 57, M 582, CMV562, CMV 563 |
| Anode voltage | +120V / 2 × 1mA |
| Polarization voltage * | 0 / +60V / +120V |
| Heating voltage | +5,8V / 2 × 150mA |
| Mains voltage | 110V / 230V, 50-60Hz |
| Power consumption | max. 6W |
| Inputs | 2 × 6-pin XLR female |
| Outputs | 2 × 3-pin XLR male |
| Dimensions b × h × t | 483 × 45 × 175 |
| Weight | 1,9kg |
| Pin | Inputs 6-pin XLR | Pin | Outputs 3-pin XLR |
|---|---|---|---|
| 1 | Ground | 1 | Ground |
| 2 | Life hot + | 2 | Life hot + |
| 3 | Anode voltage | 3 | Life cold - |
| 4 | Heating voltage | ||
| 5 | Life cold - | ||
| 6 | Polarization voltage |
The pinning of input connectors is the same like original pinning of mikrophon sockets.