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Your contact: +49 - 212 8804-0 • info@reo.de

RFT-HiFi

Toroidal fixed transformers, Audio transducer

RFT-HiFi

Unique Selling Point


  • no hum
  • iron core without air gap , low core losses
  • low voltage drop
  • minimum total weight
  • low volume
  • high efficiency
  • low magnetic field
  • also available with sealed center hole

Description


No hum of REO-Transformers

For audio applications, it is particularly important that the transformers work noiseless work and the hum of the transformer is reduced to a minimum. An optimized design of the windings per volt reduces annoying buzzing sounds. This adjustement ensures a small THD and a pure sound.

Furthermore, the use of an toroidal tapewound cores avoids the vibration of the transformer core. An additional vacuum impregnation of the windings and the lack of air gaps eliminate the typical humming noise of transformers almost completely.

Small space requirement and less weight

Toroidal audio transformers have significant advantages compared to conventional transformers: Their design results in a very small volume and light weight. Like that, the transformer has small dimensions and at the same time high levels of efficiency.

Minimum stray field

Between no-load and full load, the change of the secondary voltage is many times smaller than in transformers with nested core. 

In audio appications it is important to keep the stray field as low as possible, so that the other housing parts are not animated to oscillate, which can lead to more disturbing noises.

RFT HiFi: 

Broadband audio transformer for adjustment of low-amplifier outputs (Nominal impedance 4 Ohm)  at outputs with 70/100-V-constant voltage for professional use; low stray field toroidaö core transformer.

  • Power transfer up to 500 W at 70/100 V constant voltage
  • THD 0,04…0,09
  • Frequency range  40…18 000 Hz
  • High electrical safety due to galvanically isolated windings

Technical Data


  • Nominal load impedance 100/70V : 20-80/10-39,98 Ω
  • Input impedance : 4 Ω
Your contact: +49 - 212 8804-0 • info@reo.de

RFT-HiFi

Toroidal fixed transformers, Audio transducer

Technical data

Type

Peak
o
utput power
[W]

Rated load
impedance
100/70V

Input
impedance

Input
voltage for nom.
100/70,7V 
output
voltage at
1 kHz

Output voltage
at nom. inout
at 1 kHz

Peak
Performance
[W]

Transmission
range
typ.[dB at Hz]

Typical
THD
[% at Hz]

RFT-HiFi 125

125

80 / 39,98 Ω

4 Ω

22,36 V

100/70,7 V

125

-0,2 / 50

+0 / 1000

-0,8/-1,3 / 16000

0,05 / 50

0,06 / 1000

0,07 / 16000

RFT-HiFi 250

250

40/19,99 Ω

4 Ω

 

31,6 V 100/70,7 V 250

-0,1 / 50

+0 / 1000

-1,0 /-1,7 / 16000

0,09 / 50

0,05 / 1000

0,06 / 16000

RFT-HiFi 350

350

28,6/14,28 Ω

4 Ω

37,39 V

100/70,7 V

350

-0,2 / 50

+0 / 1000

-2,7/-3,2 / 16000

0,08 / 50

0,04 / 1000

0,06 / 16000

RFT-HiFi 500

500

20,0/10,0 Ω

4 Ω

44,7 V

100/70,7 V

500

-0,2 / 50

+0 / 1000

-2,0/-2,4 / 16000

0,09 / 50

0,05 / 1000

0,06 / 16000

   * 

Frequency response and THD: values ​​each at 50 Hz / 1000 Hz / 16000 Hz

 

Your contact: +49 - 212 8804-0 • info@reo.de

RFT-HiFi

Toroidal fixed transformers, Audio transducer

Mounting Accessories

When ordering, please state:

Mounting Accessories

  • 1 Screw, DIN 931 - 8.8
  • 1 Metal washer
  • 2 Neopren washer(Dimension depends on power rate)

 

Dimension drawing

 

 

Dimensions

Type

Da
[mm] 

H
[mm]

Total weight
[kg]

BF-Set

1xES/2xGS
[mm]

DIN
931-8.8

Screws 1x
[mm]

RFT-HiFi 125

110

40

1,3

70/80

M6x50

RFT-HiFi 250

110

60

2,3

70/80

M6x70

RFT-HiFi 350

140

60

3,2

90/100

M6x70

RFT-HiFi 500

150

65

4,5

110/120

M8x75

Your contact: +49 - 212 8804-0 • info@reo.de

RFT-HiFi

Toroidal fixed transformers, Audio transducer

Sheme of the magnetic stray field of a toroidal transformer

 

Sheme of the magnetic stray field with optimized winding technology 

 

 

Your contact: +49 - 212 8804-0 • info@reo.de

RFT-HiFi

Toroidal fixed transformers, Audio transducer

Also available with sealed center hole: