Trafo shielding sheet

(15 Reviews)

SKU: 20110429AT
Category: Trafo shielding
Manufacturers: Don-Audio

Trafo shield for toroidal trafos: 35cm x 4cm

18,19 €

incl. 19% VAT. , plus

From	Unit price / pcs
3	15,47 €*
30	14,55 €*
100	12,73 €*
200	11,82 €*

Item out of stock

Our electro sheet is for use with toroidal trafos. It consists of two grain-oriented-steel layers that effects

double shielding around the toroid and 6-times shielding on the overlapping to eleminate horizontal radiation hum and noise of toroidal trafos.

The shielding sheet is placed around the toroidal transformer and the overlapping of the sheet is placed perfectly to the cable outbreak of the transformer. The shielding sheet can be fixed with a fixation tape, adhesive tape or rubber.

Commonly used to match highend stereo audio-gear that has different noise levels on left and right channel cause of trafo noise, hum. If the channel next to the toroidal trafo has a worser noise floor than the channel with greater distance to the trafo, this is an indicator for electro magnetic fields around the toroidaltransformer. In this case use the trafo shielding sheet, wrap it around your toroid-trafo to solve the electro magnetic radiation problem completely.

Specs:

Size: 35cm x 4cm

Material:

two layer "grain-oriented steel with 3% silizium" - "DIN46400"

Application:

trafo shielding

For more information (google translated - Please read the german description for original):

The effect of the electric shielding is not only cause the chemical composition, in particular its own special grain structure. In contrast to conventional steel, which consists of a chaotic arrangement of tiny crystals adhering to each other, the grains of the electro sheets are actually extremely large and also regarding orientation of their crystal axes aligned uniformly.

This equal grain orientation that matters, because the magnetisation of the material can be influenced.Cause its structure the material contracts to the de-magnetisation process very less resistance, in alternating 50 times a second, than conventional steels. Mu-metal has similar properties. This grain structure is achieved by a so-called thermo-mechanical treatment in the disturbed by a cold rolling process, the grain structure and a five to seven days a recrystallization heat treatment takes place.

How to install our sheets:
The trafo shielding sheet can be wrapped around the toroidal trafo. Fix it with a tape and take the overlapping part to the outgoing wires as descripted in the following PDF file. Fix it with a tape. For a detailled instruction take a look into the PDF.

Shipping weight:	0,12 kg
Item weight:	0,03 kg
keine preissuchmaschinen:	1

Average item rating

All reviews:

Entries 1 – 10 of 14

Trafo Shielding Sheet XL
Effective to shield out the magnetic field around the transformer.

Simon L , 27.08.2014 Verified purchase

Great product
I shielded my old Trace Elliot GP12SMX transformer with it and the hum that was bugging me for ages is now gone.

Laurent C , 17.05.2016 Verified purchase

Excellent Product
Installed around my 90mm diameter Torroid transformer in my electronic crossover. Measured 80% reduction in EMF from both the top and sides. Should do the job.
Tried on another amp with more modest results because wires got in the way of slipping it on more that 75%. Probably would work if I had cut a recess to make better fit. Will order another one and give that a try :-)

Brian C , 23.06.2016 Verified purchase

Very good product for shielding stray filed of toroidal transformer
The product works really as advertised ! It is very efficient in shielding the stray magnetic field of toroidal transformers.
I had a weak hum at the output of a tube headphone amp due to the stray field of the toroid power transformer coupling into the output transformers. Installing the trafo shielding sheet around the toroidal power transformer solved this problem completely.

Fernand G , 08.03.2017 Verified purchase

Trafo shielding sheet used in preamps
Hi All,
I built 12 microphone pre-amps in one 3u rack together with quite big transformer and I found hum on the last channel. This channel is 5cm away from the transformer and I tried to shield it by thick Iron. Hum was still there. My last chance was this trafo shielding sheet before to make separate power supply box. Installation was very easy. Turn it up and Yippee! HUM is gone. I did not believe it much, but now I can only recommend it.

Jan Š , 20.10.2017 Verified purchase

Hum stopper
This sheet works very well.

Ari R , 28.09.2019 Verified purchase

Efectively reduces hum on integrated amp
Bought this to reduce transformer hum on a Rega Brio-R integrated amp. This equipement is housed in a half-width case, meaning the low distance between transformer and electronics caused a small but audioble hum on speakers when sitting close to the speakers (which I am when listing to headphones).
The trafo shielding sheet was exact size for this amp and greatly reduced the hum - to the point where is no longer noticeble.
Installation we very easy; make sure to follow the instruction and get very tight fit around the transformer and overlap the shielding sheet near the cable exit point for maximal effectiveness.

Pedro V , 19.03.2021 Verified purchase

Simple and cheap fix
After finishing my second version of Bruce Hernans http://diyaudioprojects.com/Tubes/6DJ8-Tube-Headphone-Amp/ headphone amp I was left with some slight hum when using my ZMF Verités. I bought one of the normal sized sheets, covered it in Kapton tape and bent it to fit around the Edcor XPWR083A. I could actually hear the hum just go away by putting it over.

Very much recommended if youre using a smaller open power transformer, even a non-toroidal one. Ill be definitely picking up a second one once I get around to re-working my previous build.

Geoffrey W , 18.11.2022 Verified purchase

Wirksam oder überflüssig?
Nachdem der Aufbau des bekannten Gyraf G9 Preamps problemlos verlief und der Preamp auch grundsätzlich funktionierte, hatte ich im Bereich von -80dbFS mit einem hörbaren Störgeräusch zu kämpfen, das für mich zunächst klang, wie ein Ground-Loop. Nachdem die Erdungs- / 0V-Kabel Kabel nochmals geprüft waren, lagerte ich die Trafos aus dem Gehäuse aus. Das Störgeräusch verminderte sich leicht. Leider verschwand das Störgeräusch erst, wenn die Trafos ca. 50 cm Abstand zum Gehäuse hatten. Erkenntnis: Die Einstreuungen kamen von den beiden Ringkerntrafos und das Blechgehäuse kann diese nicht wirksam abschirmen. Da ich die Trafos zumindest an der Rückseite des Gehäuses anbringen wollte, habe ich auf gut Glück 2 Abschirmbleche ausprobiert. Und was soll ich sagen: Sie tun tatsächlich was sie sollen, nämlich wirksam die Trafo-Streufelder reduzieren. Jetzt hört man nur noch den Rauschteppich der bei voller Verstärkung jenseits der 100 dbFS-Marke liegt. Die Abschirmbleche machen wirklich glücklich!

Sebastian B , 19.11.2012 Verified purchase