Cores nanocrystalline for audio equipment

MSTAN series

Toroidal cores of the new MSTAN series (KVSU.684459.091TU) are made of a thin (18 ± 2 μm) nanocrystalline ribbon AMAG 200C based on iron and are distinguished by a high initial magnetic permeability (65 000 at 50 Hz), high saturation induction (1.16 T), narrow linear hysteresis loop, low coercive force, low losses, increased operating temperature (up to 155 ° C), good temperature stability.

Cores are used in audio transformers for various purposes: input, interstage, output, phase inverters, etc. First of all, the products are designed for operation in push-pull circuits, where there is no direct bias current.

• The use of cores of the MSTAN series in audio transformers allows, with a small number of winding turns, to obtain very high values ​​of the inductance of the primary winding (several hundred henries) and impedance.

• High inductance in combination with a linear hysteresis loop can dramatically reduce distortion in the low-frequency region and expand the frequency range to a few hertz.

• Good linearity of the hysteresis loop provides a weak dependence of the permeability on the induction amplitude, which contributes to the improvement of sound quality at low volume (first watt effect).

• Audio transformers based on MSTAN series have excellent electromagnetic coupling of windings, low leakage inductance, high quality factor.

 

For more details about the benefits you can find:

   • Article "Nanocrystalline materials for audio technology"

   • Video "Solving the problem of the first Watt"

Dimensions and main characteristics

Серия MSTAN

Core name ​​

Габаритные размеры*

в контейнере
(без контейнера)
(D-d-H)
(мм)

 Эффект. сечение
Ас, мм2		 Длина средней линии
Lm, мм		 Масса в контейнере, г
(масса без контейнера, г) **		 Коэф.
прямоуг. Kпр.,
не более (200 Гц, 100 A/м)		 Коэффициент индуктивности
AL, мкГн/виток2
(1 кГц, 20 мА×виток) ***

 

In a plastic container
MSTAN-10S-TH

11,4 – 5,0 – 6,1
(10,0 – 6,7 – 4,5)

5,3

26,2

1,45
(1,0)

0,3

15,4

MSTAN-12S-TH

14,2 – 6,4 – 6,5
(12,0 – 8,0 – 4,5)

6,5

31,4

2,3
(1,5)

0,3

15,6

MSTAN-15A-TH

16,9 – 10,0 – 6,5
(15,0 – 12,0 – 4,5)

4,9

42,4

2,3
(1,5)

0,3

8,6

MSTAN-16A-TH

18,0 – 8,0 – 8,3
(16,0 – 10,0 – 6,0)

13,0

40,8

5,3
(3,9)

0,3

23,9

MSTAN-18S-TH

20,0 – 10,2 – 6,6
(18,0 – 12,0 – 4,5)

9,7

47,1

4,6
(3,3)

0,3

15,6

MSTAN-20A-TH

22,7 – 10,2 – 10,3
(20,0 – 12,5 – 8,0)

21,6

51,0

10,9
(8,0)

0,3

31,9

MSTAN-25A-TH

27,9 – 17,1 – 12,9
(25,0 – 20,0 – 10,0)

18,0

70,7

14,1
(9,3)

0,3

19,2

MSTAN-25S-TH

28,6 – 13,6 – 12,5
(25,0 – 16,0 – 10,0)

32,4

64,4

20,3
(15,2)

0,3

37,9

MSTAN-30S-TH

33,0 – 17,6 – 12,9
(30,0 – 20,0 – 10,0)

36,0

78,5

26,8
(20,6)

0,3

34,6

MSTAN-32S-TH

34,8 – 17,4 – 12,8
(32,0 – 20,0 – 10,0)

43,2

81,6

33
(25,7)

0,3

39,9

MSTAN-40A-TH

42,7 – 28,8 – 18,2
(40,0 – 32,0 – 15,0)

43,2

113,0

48,6
(35,6)

0,3

28,8

MSTAN-40S-TH

40,9 – 23,2 – 15,5
(38,0 – 26,0 – 12,0)

51,8

100,5

47,4
(38,0)

0,3

38,9

MSTAN-45S-TH1

48,3 – 21,7 – 23,5
(45,0 – 25,0 – 20,0)

144,0

109,9

141
(115,5)

0,3

98,7

MSTAN-50S-TH1

54,0 – 36,0 – 24,1
(50,0 – 40,0 – 20,0)

72,0

141,3

93,4
(74,3)

0,3

38,4

MSTAN-60S-TH

64,5 – 40,5 – 25,0
(60,0 – 45,0 – 20,0)

108,0

164,9

166
(130,0)

0,3

49,4

MSTAN-60A-TH

64,1 – 36,0 – 34,5
(60,0 – 40,0 – 30,0)

216,0

157,0

287
(247,6)

0,3

103,7

MSTAN-63A-TH

67,5 – 46,5 – 28,8
(63,0 – 50,0 – 25,0)

117,0

177,4

194
(151,5)

0,3

49,7

MSTAN-64A-TH

68,5 – 37,0 – 34,5
(64,0 – 40,0 – 30,0)

259,2

163,3

360
(309,0)

0,3

119,6

MSTAN-64S-TH

68,7 – 36,8 – 24,7
(64,0 – 40,0 – 20,0)

172,8

163,3

245
(206,0)

0,3

79,8

MSTAN-80A-TH

84,5 – 59,0 – 29,6
(80,0 – 63,0 – 25,0)

153,0

224,5

298
(250,8)

0,3

51,4

MSTAN-80S-TH

84,5 – 46,5 – 25,5
(80,0 – 50,0 – 20,0)

216,0

204,1

370
(321,8)

0,3

79,8

MSTAN-90S-TH

94,0 – 46,5 – 35,5
(90,0 – 50,0 – 30,0)

432,0

219,8

750
(693,2)

0,3

148,1

MSTAN-100A-TH

104,0 – 47,0 – 29,5
(100,0 – 50,0 – 25,0)

450,0

235,5

830
(773,6)

0,3

144,0

MSTAN-100S-TH

105,0 – 75,3 – 25,0
(100,0 – 80,0 – 20,0)

144,0

282,6

356
(297,0)

0,3

41,3

MSTAN-120A-TH

124,0 – 75,5 – 36,5
(120,0 – 80,0 – 30,0)

432,0

314,0

1055
(990,2)

0,3

103,7

MSTAN-120S-TH

126,5 – 74,5 – 26,0
(120,0 – 80,0 – 20,0)

288,0

314,0

730
(660,2)

0,3

69,1

MSTAN-170A-TH

175,0 – 115,0 – 31,0
(170,0 – 120,0 – 25,0)

450,0

455,3

1575
(1495)

0,3

80,1

 

Paint coating

MSTANP-10S-TH

11,0 – 5,5 – 5,5
(10,0 – 6,7 – 4,5)

5,3

26,2

1,4
(1,0)

0,35

12,3

MSTANP-12S-TH

13,0 – 7,0 – 5,5
(12,0 – 8,0 – 4,5)

6,5

31,4

1,9
(1,5)

0,35

12,5

MSTANP-15A-TH

16,0 – 11,0 – 5,5
(15,0 – 12,0 – 4,5)

4,9

42,4

2,0
(1,5)

0,35

6,9

MSTANP-16A-TH

17,0 – 9,0 – 7,0
(16,0 – 10,0 – 6,0)

13,0

40,8

4,6
(3,9)

0,35

19,1

MSTANP-18S-TH

19,0 – 11,0 – 5,5
(18,0 – 12,0 – 4,5)

9,7

47,1

4,0
(3,3)

0,35

12,5

MSTANP-20A-TH

21,0 – 11,5 – 9,0
(20,0 – 12,5 – 8,0)

21,6

51,0

9,1
(8,0)

0,35

25,5

MSTANP-25A-TH

26,0 – 19,0 – 11,0
(25,0 – 20,0 – 10,0)

18,0

70,7

10,9
(9,3)

0,35

15,4

MSTANP-25S-TH

26,0 – 17,0 – 11,0
(25,0 – 16,0 – 10,0)

32,4

64,4

15,7
(15,2)

0,35

30,3

MSTANP-30S-TH

31,0 – 19,0 – 11,0
(30,0 – 20,0 – 10,0)

36,0

78,5

22,7
(20,6)

0,35

27,7

MSTANP-32S-TH

33,0 – 19,0 – 11,0
(32,0 – 20,0 – 10,0)

43,2

81,6

28,1
(25,7)

0,35

31,9

MSTANP-40A-TH

41,0 – 31,0 – 16,0
(40,0 – 32,0 – 15,0)

43,2

113,0

39,4
(35,6)

0,35

23,0

MSTANP-40S-TH

39,0 – 25,0 – 13,0
(38,0 – 26,0 – 12,0)

51,8

100,5

41,2
(38,0)

0,35

31,1

MSTANP-45S-TH

46,0 – 26,0 – 21,0
(45,0 – 25,0 – 20,0)

144

109,9

121,8
(115,5)

0,35

79,0
  • * OD, HT, D, H - no more; ID, d - no less.
  • ** Deviation of the mass of magnetic cores (without container) no more than ± 10%.
  • *** Nominal value of single-turn winding inductance (Tolerance + 40 / -25%).

Note: It is allowed to supply magnetic cores of other standard sizes, including in containers supplied by the Customer under a separate agreement.

 

 

 

By agreement, it is possible to manufacture the above magnetic cores from the new AMAG 204 alloy, which is characterized by increased linearity, lower permeability (within 10,000 - 15,000).

The new alloy is more optimal for output transformers. It is also possible to use the materials AMAG 201, AMAG 211.

 

​ Specifications (extract) KVSU.684459.091 TU (MSTAN series)

Application

  • Audio transformers in push-pull amplifiers
  • Audio transformers in single-ended amplifiers (with compensation winding)
  • Audio transformers in tube amplifiers
  • Output audio transformers
  • Interstage audio transformers
  • Transformers for stepped volume controls
  • Small signal audio transformers
  • Microphone transformers
  • Matching transformers for digital signal sources
  • Vinyl phono stage transformers
  • Phase inverters
  • Matching transformers after the DAC

Advantages

  • Linear narrow hysteresis loop
  • High initial magnetic permeability
  • Typical initial magnetic permeability - not less than 80% of the maximum
  • Permeability stability over the entire induction range
  • High inductance and primary impedance
  • Ability to work with a high-impedance signal source
  • Small number of turns
  • Low parasitic capacitance of windings
  • Wide frequency range
  • Good electromagnetic coupling of the windings
  • Reduced winding requirements
  • Low leakage inductance
  • High quality factor
  • Low harmonic distortion
  • Low active resistance of the windings
  • Low losses in the magnetic circuit and wires
  • High efficiency
  • Increased operating temperature and stability

 

Additional parameters and characteristics

Dependence of the inductance factor on frequency
Dependence of initial permeability on frequency
Dependence of the amplitude magnetic permeability (F = 50 Hz) on the amplitude of induction
Dependence of the amplitude magnetic permeability (F = 50 Hz) on the amplitude of induction
MSTAN Series Initial Magnetization Curve (50Hz)
Dependence of the impedance of a single-turn winding on the frequency
(MSTAN-20A-T)
Temperature dependence of the LT / L20 ratio
(LТ - inductance at a specific temperature, L20 - inductance at 20 °C)

The main characteristics of the material used

  • Material AMAG 200C
  • Induction amplitude, Bm (25 °C) 1.16 T
  • Curie temperature, Tc: 560 °C
  • Saturation magnetostriction: less 0,5x10-6
  • Magnetic permeability (50 Hz) – 65 000 (+40/-25%)
  • Magnetic permeability (10 kHz) – 60 000 (+40/-25%)
  • Squareness coefficient (200 Hz) – no more 0,3 
  • Density: 7.3 g/cm3

Design

  1. Flame retardant plastic container (MSTAN-TH). A plastic container with a rigid structure and rounded edges provides reliable mechanical protection of the magnetic circuit from external influences while maintaining its properties, as well as the ability to apply winding with a wire of large diameter.
  2. Powder coated with epoxy paint (MSTANP-TH). The dimensions of the magnetic circuit are reduced, but the parameters deteriorate due to additional impregnation and mechanical action on the material of the magnetic circuit.

Fire safety of the magnetic circuit and its constituent elements is ensured by the use of non-combustible and non-flammable materials.

Recording example

MSTAN(P)-10S-TH, where:

  • MS – MSTATOR;
  • T – application (transformers);
  • A – audio;
  • N – nanocrystalline;
  • P – paint coating;
  • 10 – outer diameter, mm;
  • S – sectional designation;
  • TH – precision annealing in a strong transverse magnetic field
  • ТН1 - special grooves in the container for the installation of a dielectric insulating partition