My t-outliner makes loud noise

The Andis T-Outliner that you purchase from the USA is not for UK voltage 220 50 HZ, the Voltage is too high, the only way to control the voltage is transformer from 220V to 120 V. The Andis Trimmer that may work for you is the GTX trimmer this trimmer was manufactured for Canada and there voltage is 220V 50HZ.
Manny's Sharpening 323 237-2885 Manny Mobile Sharpening and Clipper Parts Supplies

This unit will not work correctly in the UK as it has a magnetic motor. No matter how you try to tune it it will be very loud and eventually the motor will burn out.

you can not fix the noise if you are using the outliners outside of the usa because even though you are using a transformer to adjust the voltage it doesnt change the hertz and that is what makes it make that noise.....just open the clipper up and fill it with sponge. Mainly around the top of the clipper....it has to be enough to stop the motor from vibrating so much without putting so much pressure on them the blades cant move quickly. after you have done that you may find that the noise will stop depending on how tightly you have screwed the casing back together.....it may take a couple of days of using the clipper and allowing it to heat up a bit for the sponge to mould around the motor. but at the same time using this method will amost definitely effect the performance of the trimmer. if i were you i would bite the bullet and ditch them and perhaps look at a trimmer thats manufactured for countries outside of the u.s.a.......i know the wahl lithium beret is a very sharp blade but doesnt have the t blade....i would still recommend the beret over a t shaped blade like the wahl detailer because it is sharper

Voltage & Frequency Converter

The problem you describe is most likely due to the fact that the machine you bought is designed to operate on 110v/60Hz electrical supply as used in North America. In fact the T-Outliner is only designed to operate on 110v/60Hz so even if you use a transformer you will only convert the voltage from 110v to 230v. You will not convert the frequency 'Hz' from 60Hz to 50Hz which is necessary with an electrical product with many moving parts such as a clipper to operate correctly on the European electrical supply which is 230v/50Hz........Check on ebay 'Voltage and Frequency Converter' about 65 pounds. The only solution

adjust the convergence settings

Look on the side of the clipper handle. You ahould see what appears to be a screw. With your clipper plugged in and turned on, turn that screw with a screw driver in either direction, the noise you are talking about should quiet down quite a bit,

This trimmer is only made to be used with 110V, we do not have this model in 240V. There is no way to stop the noise. If you would like to purchase a unit made for 240V please call 1-800-558-9441 and speak with one of the Andis customer service reps.

Thank you for purchasing Andis.

you should check the outline ctrl..for a mic...it could produce a noise...if you have your speakers connected to pc...check the position of the plugs and the volumen of mic put in down...