We can provide power transformer which use for 117V, 220V, 230V, 240V.
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OTOMON LAB Soverign preamp with O.F.A.T 48 steps finemet attenuator transformer, input, output balanced
OTOMON LAB Soverign preamp with O.F.A.T 48 steps finemet attenuator transformer, input, output balanced
O.F.A.T is Otomon Finamet Attenuator Transformer.
Power supply is regulated by 300B and 6DJ8 tube.
Advantage point as using tube to regulate the current and voltage.
Why Stabilize Current Instead of Voltage?
With vacuum tube current regulation, the voltage automatically adjusts to compensate for rising DCR, maintaining consistent amplifier performance.
Why Are Vacuum Tubes Superior to Resistors?
While resistors and capacitors alone can produce the desired voltage, resistors—like coils—generate heat during operation. This increases DCR, reducing current flow to the coil.
Vacuum tubes, however, exhibit minimal temperature drift after warm-up and negligible voltage drop. By combining tubes, we ensure stable output current, with voltage dynamically adjusting to DCR fluctuations.
Tubes using in preamp is 12AY7(12AT7) x 4
Attenuator transformer make the sound very clear, good control in bass sound that never have in normal resistor attenuator.
Specification:
Response frequency: 10Hz ~ 80Khz
Hum level : 0.08mV
Input impedance: 600 ohm
Ouput impedance : 150 ohm
Regulator tube : 6DJ8, 300B
Rectifier tube: 5U4G
All tubes are included.
O.F.A.T is Otomon Finamet Attenuator Transformer.
Power supply is regulated by 300B and 6DJ8 tube.
Advantage point as using tube to regulate the current and voltage.
Why Stabilize Current Instead of Voltage?
With vacuum tube current regulation, the voltage automatically adjusts to compensate for rising DCR, maintaining consistent amplifier performance.
Why Are Vacuum Tubes Superior to Resistors?
While resistors and capacitors alone can produce the desired voltage, resistors—like coils—generate heat during operation. This increases DCR, reducing current flow to the coil.
Vacuum tubes, however, exhibit minimal temperature drift after warm-up and negligible voltage drop. By combining tubes, we ensure stable output current, with voltage dynamically adjusting to DCR fluctuations.
Tubes using in preamp is 12AY7(12AT7) x 4
Attenuator transformer make the sound very clear, good control in bass sound that never have in normal resistor attenuator.
Specification:
Response frequency: 10Hz ~ 80Khz
Hum level : 0.08mV
Input impedance: 600 ohm
Ouput impedance : 150 ohm
Regulator tube : 6DJ8, 300B
Rectifier tube: 5U4G
All tubes are included.
Here is what is called finemet core
FINEMET® is registered trade mark of Hitachi Metals Ltd.
FINEMET® is a Nanocrystalline amorphous soft magnetic metal. It's phase characteristics is far better than conventional core material such as Ni and Co-based amorphous metal. Amorphous metals do not have a crystalline structure like other magnetic materials. All the atoms in an amorphous metal are randomly arranged, thus giving it a higher resistivity (about three times) value than that for crystalline counterparts. Amorphous alloys are prepared by cooling the melt at a rate of about million degrees per second. This fast cooling does not give the atoms enough time to rearrange into a stable crystalline form. As a result one gets metastable amorphous structure. Because of the absence of crystalline structure amorphous alloys are magnetically soft (lower coercivity, lower core loss, higher permeability). High resistivity gives lower loss at higher frequencies. The losses are among the lowest of any known magnetic materials.
Features:
1) Satisfy both high saturation magnetic flux density and high permeability
High saturation magnetic flux density comparable to Fe-based amorphous metal. High permeability comparable to Co-based amorphous metal.
2) Low core loss.
1/5th the core loss of Fe based amorphous metal and approximately the same core loss as Co-based amorphous metal.
3) Low magnetostriction. Less affected by mechanical stress. Very low audio noise emission.
4) Excellent temperature characteristics and small aging effects. Small permeability variation (less than ±10%) at a temperature range of -50°C~150°C. Unlike Co-based amorphous metals, aging effects are very small.
5) Excellent high frequency characteristics. High permeability and low core loss over wide frequency range, which is equivalent to Co-based amorphous metal.
6) Flexibility to control magnetic properties “B-H curve shape” during annealing Three types of B-H curve squareness, high, middle and low remanence ratio, corresponding to various applications.
FINEMET® is registered trade mark of Hitachi Metals Ltd.
FINEMET® is a Nanocrystalline amorphous soft magnetic metal. It's phase characteristics is far better than conventional core material such as Ni and Co-based amorphous metal. Amorphous metals do not have a crystalline structure like other magnetic materials. All the atoms in an amorphous metal are randomly arranged, thus giving it a higher resistivity (about three times) value than that for crystalline counterparts. Amorphous alloys are prepared by cooling the melt at a rate of about million degrees per second. This fast cooling does not give the atoms enough time to rearrange into a stable crystalline form. As a result one gets metastable amorphous structure. Because of the absence of crystalline structure amorphous alloys are magnetically soft (lower coercivity, lower core loss, higher permeability). High resistivity gives lower loss at higher frequencies. The losses are among the lowest of any known magnetic materials.
Features:
1) Satisfy both high saturation magnetic flux density and high permeability
High saturation magnetic flux density comparable to Fe-based amorphous metal. High permeability comparable to Co-based amorphous metal.
2) Low core loss.
1/5th the core loss of Fe based amorphous metal and approximately the same core loss as Co-based amorphous metal.
3) Low magnetostriction. Less affected by mechanical stress. Very low audio noise emission.
4) Excellent temperature characteristics and small aging effects. Small permeability variation (less than ±10%) at a temperature range of -50°C~150°C. Unlike Co-based amorphous metals, aging effects are very small.
5) Excellent high frequency characteristics. High permeability and low core loss over wide frequency range, which is equivalent to Co-based amorphous metal.
6) Flexibility to control magnetic properties “B-H curve shape” during annealing Three types of B-H curve squareness, high, middle and low remanence ratio, corresponding to various applications.
$6,000.00
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