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We are a reputed manufacturer and supplier of variacs over the past two decades. Our valuable OE clients classify our product as 'top of the line'. 
The company is headed by Mr. Umesh Marathe, who is B.Tech in Electrical Engineering from I.I.T. Mumbai. His high degree of technical competence coupled with quality consciousness and years of manufacturing experience has built Radiotone's image as a supplier of high quality products. His insight has inspired him to design products to solve typical industry problems. Mr. Marathe has pioneered the design of Double layer variacs way back in 1979-1980 and is now very widely used by all servo stabilizer manufacturers. Over the last 25 years, it has saved a lot of valuable foreign exchange as this design reduced the import of copper and core substantially. He has successfully developed vertical Roller Contact Variac, both SL & DL, in various current capacities.
We have over 4000 sq.ft. of manufacturing facility with state of art German winding machines, and highly skilled manpower. We are currently exporting to Europe, USA and South Africa.
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Double Wound Isolated Variable Transformer
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Engineers, Scientists, Technicians working in laboratories on sensitive equipments have a need for Isolated mains supply, with a variable output Voltage. This facilitates them in testing various devices demanding different voltages & currents. It is also an Electrical Engg. practice to test devices by applying steadily increasing voltage from 0 V to the device rated voltage. To achieve the above objective, it is normal practice to use a Variauto followed by a 1: 1 Isolation transformer or vice versa as shown in figure 1. This combination becomes very bulky (heavy) with two separate transformers, wiring or a combined bulky box. occupying much of test test bench space. This is more so as the current rating or VA increasing. It looses its mobility.


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High Current Air Cooled Variauto
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We  specialize  in  manufacturing  High  Current  Air Cooled  Variauto in  Single Phase & Three Phase 100A200A, 400A. The   picture   shows   single   phase   Variautos 200A each.  Three Phase units are built by using such three stacks & motorizing them on common  shaft.  This is a substitute for Oil cooled units which are less preferred in many  non hazardous application for safety reasons.  They  are very easy to  maintain  &  service. Enclosed  units  can  be  manufacture as shown (200A, 440V).  These variautos are more preferred for safety reasons  over  Oil Cooled variautos.


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Single Layer Variautos Electronic Transformers
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The Variautos offered by Radio Electric is a simple & rugged method to control power, voltage & current. They are designed for heavy duty continuous use. They can provide high current rating, & overload capacity. Radio Electric specilises in design tailor made variautos.They are commonly known as Variac Auto Transformer.

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Double Layer Variautos Transformers
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The DL (Double Layer) Variauto was specially designed in 1982, for the Servo Controlled Voltage Stabiliser Industry. Since then we have supplied thousands of such Variautos to the Industry & we can claim to be pioneers in India in this field of Variautos.

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Variable Inductors
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Variable Inductors

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This is a new concept & can be used in powerfactor correctionpanels for adjusting the Inductance value. This harmonic Filter choke is manufactured using Cu strip wound edgewise thus making its size compact. These chokes can also be manufactured in single phase using toroidal core with air gap. This can be alsoused in Engineering College, Laboratories on the Test bench for adjusting the Parameters in the electrical circuit.

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Variauto Transformers
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Variauto Transformers

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This is a very compact Motorized Variauto which uses the coil cavity to fit the motor assembly.  We use roller brushes in this product for low torque and smooth operation. The speed of the motor can also be varied (time span for one rotation) by varying the DC voltage.

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Custom Made AC Power Supply
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These are tailor-made products used mainly for Testing High Voltage High Power  Motors& Switch gears. We have manufactured and supplied such units to UL India.0 to 660V, 3Ph, 100A with pre-settable voltage

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AMP Single Layer Variauto Transformer
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These variautos  are used in Instrumentation, HV Testers & Aviation (400 Hz).  All the models are coated for physical protection as shown in picture.  We use Roller brushes for very smooth long lasting & arc free contact. 

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