Smaller size
For the same power rating it is smaller than an EI-lamination transformer and fits easily into tight enclosures.
Since 1990 · Belgrade
Precisely.Wound.To your spec.
Toroidal transformers 20–4000 VA
and autotransformers up to 5000 VA,
wound for your equipment.
- Thermal fuseTrips at 115–130 °C in every transformer
- Nikola Tesla InstituteSRPS N.H8.010 / 022 / 023
- ISO 9001:2015Certified quality system
- Worldwide shippingFrom one unit to a full series
Why toroidal
Smaller, quieter and cooler.
A toroidal transformer does the same job as a conventional one, but it is more compact, has lower losses and radiates a weaker electromagnetic field. That is why manufacturers of power supplies, audio equipment and medical devices choose it.
Lower losses
A core of imported grade 3407 transformer steel gives lower losses and less heating in operation.
Weaker radiation
The winding covers the core evenly, so electromagnetic radiation is lower than with conventional designs.
Cooling and mounting
The windings sit on the outside and cool better. The transformer is fixed with a single bolt.
Products
Four lines. One standard.
Isolation transformers
Separate primary and secondary windings protect against electric shock. Mandatory for medical equipment.
Details
Choosing the power rating
How many VA do you need?
Pick a standard power rating to see the approximate dimensions, weight, lead length and voltage drop under load at once. The values come from our price list.
500VA
S suffix: a version with a smaller diameter and greater height.
Dimensions D × H136 × 60 mm
Weight4.30 kg
Lead length140 mm
Voltage drop5.00 %
A 115–130 °C thermal fuse is fitted as standard.
Mounting kit for 100–1200 VA
For 300–3000 VA we recommend Soft Start or slow-blow fuses.
Full table of dimensions and weights
Tube Audio · Licence
Menno van der Veen. Wound in Belgrade.
After more than a year of development and testing, we manufacture under licence the renowned toroidal output transformers for tube amplifiers designed by the Dutch specialist Menno van der Veen.
7Push-Pull models
7Specialist models
5Single Ended models
How we work
From enquiry to delivery.
Every transformer follows the same path through our workshop, whether you order a single unit or a full series.
- 01
Enquiry and specification
You send the power rating, voltages, currents and installation conditions. If anything is missing, we help you define it.
- 02
Design calculation
We design each transformer with RALE Engineering software and experience built up since 1990.
- 03
Winding
A core of imported 3407 transformer steel, with windings of TENVEX 200 and G2 enamelled copper wire.
- 04
Vacuum varnishing
We vacuum-impregnate the core with varnish so that the transformer does not hum.
- 05
Protection and records
We fit a 115–130 °C thermal fuse and keep the technical data for every unit in our archive.
- 06
Packing and delivery
A made-to-measure box, mounting kit and instructions. We ship anything from one unit to a full series, worldwide.
Applications
Where our transformers work.
Toroidal transformers go into power supplies, control systems, lighting and any equipment where a small footprint and quiet operation matter.
- Power supply units
- Rectifiers
- Voltage stabilisers and inverters
- Lift control panels
- Electric locks
- Alarm control panels
- CCTV
- Audio equipment
- Battery chargers
- Relays and contactors
- Medical devices
- Halogen lighting
- Swimming pool lighting
- Inspection pit lighting in garages
- Equipment for 110–120 V
- Tube amplifiers
Quick response
Have a specification? Send it to us.
State the power rating, primary and secondary voltages, currents and quantity. We will prepare a quote and a lead time.