RY-800VA 800VA Toroidal Audio Power Transformer AC 220V 50Hz Dual Secondary Centre Bolt Mount

1. Product Name

RY-800VA is the model number on the nameplate, which carries all identifying information for this component: the primary is red leads, AC 220 V 50 Hz, secondaries are 0 V to 38 V between yellow-yellow leads and 0 V to 38 V between blue-blue leads, with a 130°C thermal cutoff marking and date stamp. The same nameplate also bears CCC, CE and WEEE marks and a double insulation symbol. No drawing is included, so the nameplate serves as the datasheet.

The panel describes the same component in three ways: as a toroidal transformer in the 50 VA to 1000 VA series, as an audio-grade transformer, and as an 800 VA custom product. These are three angles on the same product line. The component itself is a power transformer, not an output transformer: the secondary windings power a rectifier and filter capacitors, and audio signals never pass through it.

2. Functional Description

There are two reasons to choose a toroidal transformer in audio equipment. The core is a continuous ring, so the magnetic circuit has no air gap, and its external leakage field is smaller than that of an EI-laminated transformer of the same power rating; this allows it to be mounted close to signal stages inside the chassis. The windings cover the entire core, so for the same power rating the component is shorter and wider than a laminated type, suitable for slim chassis. Two independent secondary windings with two colour-coded lead sets provide two isolated outputs, so a dual supply rail can be built with two bridge rectifiers and one transformer.

3. Construction and Windings

The manufacturing process is visible in the close-up images. Oxygen-free copper wire is wound on a seamless grain-oriented silicon steel core using radial winding, i.e. coils stand upright around the ring rather than being stacked flat, which shortens the winding length and reduces resistance. Paper and film insulation separate the windings, leads are brought out as flying leads, and the entire toroidal transformer is wrapped in transparent high-voltage insulation film, visible in the close-up as a glossy coating over the copper wire.

4. Centre Bolt Mounting

Mounting uses a single centre bolt. A black steel top plate is pressed onto the toroidal transformer, and a galvanised bolt passes through the plate and core; a nut with rubber washer and steel washer clamps the assembly. The rubber breaks the metallic path between the bolt and the top plate, preventing chassis vibration from entering the core and also preventing core vibration from being transmitted to the chassis. The toroidal transformer sits on a black base plate with four slots at the corners for fixing screws; the base plate shape allows the component to be rotated to route leads where needed.

5. Electrical Specifications

The specification panel gives five lines of parameters, repeated on the nameplate. Model RY-800VA, 800 VA. Input AC 220 V 50 Hz, red-red leads. Output 1, AC 0 V to 36 V, yellow-yellow leads. Output 2, AC 0 V to 36 V, blue-blue leads. Thermal protection, 130°C cutoff. In some photos, the nameplate on the part itself labels both secondaries as 0 V to 38 V, while another photo shows 0 V to 36 V; this is the only inconsistency in the material.

5.1 Published Parameter Set

6. Bench Measurement

A photo shows the device connected to a power analyzer with the primary winding connected: RMS 229.7 V, RMS current 0.151 A, power 34.70 W, power factor 0.996, behind it are oscilloscope waveforms of primary voltage and current. The room mains voltage is higher than the 220 V rating, and 34.70 W is about 4% of the 800 VA rating, so this is a light-load reading, not a full-load test. It shows the device operates at normal current with a clean current waveform in phase with the voltage; but no efficiency, voltage regulation or temperature rise is given.

7. Audio Performance and Series

The audio performance description on the panel is qualitative: ultra-low leakage flux, low mechanical noise, high current capacity and fast dynamic response. These descriptions give no numbers or test conditions, and the panel showing them is a 50 W 24 V product from the same series, not the 800 VA device, so they describe structural and series characteristics rather than this power rating. The series published range is 50 VA to 1000 VA, supporting single and dual outputs, as well as OEM or ODM manufacturing, with two series labels reading EEEIO-C50VA and EEEIO-C100VA, which differ from the RY-800VA prefix.

8. Packaging and Delivery

Supply form is a carton with moulded EPE foam lining, described as a heavy-duty carton that has passed drop testing. A photo shows six products standing in foam inside one carton, which is the shipping method for this series, not a statement of quantity per carton for this rating. No quantity, carton size or weight is given.

9. Quality and Compliance

The compliance panel shows four marks: CCC, CE, RoHS and UL, headed 'International Quality Certification and Standards', with a top line stating that all four cover this device. The nameplate itself carries CCC, CE, a double-square insulation symbol, a moisture-proof umbrella symbol and a WEEE bin symbol. None of the marks is accompanied by certificate numbers, standard references or reports, and the UL mark does not show the 'Recognized' wording usually associated with component certification.

10. Features

800 VA toroidal transformer. Two secondary windings on a single core, wound to the rated power, while retaining the low-profile shape characteristic of toroidal transformers at this power.

Two isolated secondary windings. Yellow-yellow and blue-blue leads, each 0 V to 36 V or 38 V (as per nameplate), so a single device can provide dual supply rails.

130°C thermal cutoff. A thermal element embedded in the winding, marked on the nameplate and identified as a protection device on the specification panel.

Oxygen-free copper, radial winding. Windings stand upright along the core edge, shortening turn length and reducing resistance.

Grain-oriented silicon steel core. Seamless silicon steel ring with no air gap in the magnetic circuit, effectively reducing leakage flux.

Centre bolt with rubber buffer. One bolt passes through the core to fix the device to the chassis base plate, with a rubber buffer and steel washer between the bolt and top plate.

11. Advantages

Can be installed inside the chassis. The toroidal transformer at this power rating is low and wide, with minimal leakage flux, so it can be mounted close to the input stage without introducing AC hum.

One device, dual supply rails. Two isolated secondary windings eliminate the second transformer usually required in dual-supply designs.

The bolt is the mounting method. The base plate needs only one mounting hole and four anti-rotation screws, no base or bracket required.

Rubber buffer is the quiet guarantee. It breaks the metallic path between the bolt and base plate, preventing core vibration from reaching the chassis.

Published power range. The same construction covers the full 50 VA to 1000 VA series; changing supply rails only requires changing the winding, not a redesign.

12. Technical Specifications

All values are transcribed from the supplier's specification panel and nameplate. When a value is missing, the cell is marked 'Not stated'. When two nameplates disagree, both readings are retained; conflicts are noted in the remarks column rather than resolved here.

13. Applications

The following uses are the application directions indicated by the product literature, noting why a toroidal transformer of this power rating suits each scenario. These descriptions indicate the product's sales positioning, not certification of a specific construction.

Power amplifier supply. The device in the photo is mounted on the amplifier base plate, supplying the energy storage filter capacitor bank.

Preamplifier and DAC supply. Used where leakage flux and mechanical noise matter more than power rating.

Powered speakers. One transformer is housed in the speaker cabinet, with rectifier and capacitors on the amplifier board.

Studio and instrument amplifiers. Two secondary windings provide dual supply rails, with a 130°C thermal cutoff as a thermal protection backup.

Industrial and control panels. Suitable for compact cabinets where the low profile and bolt mounting fit well.

Full-series OEM customisation. The same construction covers 50 VA to 1000 VA, single or dual output, manufactured to order.

14. Ordering

First provide the required supply rail parameters, then specify the values. A valid enquiry should state: mains voltage and frequency, secondary voltage and current required for each winding, whether the two windings are used as independent rails or in series, ambient temperature and mounting method. Please confirm whether the quotation refers to a 36 V or 38 V secondary, and request the following parameters because they are not published: diameter, height, weight, bolt thread specification, base plate mounting hole diameter, current per winding, voltage regulation and test voltage. If the required product is close to this model, start your enquiry with RY-800VA and list the differences.

Compliance note: The panel shows CCC, CE, RoHS and UL marks and states that all four cover the part. No certificate numbers, standard references or test reports accompany the marks, and the UL mark does not show 'Recognized'. This is presented as marks and statements only, not as verified certification. Power transformers are safety-critical components, so be sure to request certificates and reports that meet your product's required standards before finalising the design.

Brand/Manufacturer: ZXY, Shenzhen Zhixiangyuan Electronics Co., Ltd. http://www.zxycoil.com