Can anyone please tell me the difference between the Sennheiser MKH416T and the Sennheiser MKH416?

Many thanks and regards,
Neil

The "T" stands for T Power. Similar to phantom power but not the same. You can buy barrel adapters to convert phantom power to T power. If I remember correctly T power is down around 12v and will prove fatal to a phantom powered mic (and vice versa). The voltage floats to because it is not referenced to ground. It used to be known as A-B Power.

The 'T' does mean it is a T-power mic (more commonly used in Western Europe). It runs at +15v and often has a three pin mini XLR connector. Do not simply convert the connector! This will destroy your mic and possibly your phantom power module. 'T' powered mics should only be powered by mixers or pre-amps that support 'T' power. If your mixer or recorder does not support this format, you can purchase a 'T' power box for about $70 to $100 that is worn as a belt pack. These boxes power the mic via battery and send a line signal to your mixer or recorder. They also make +48V versions which can be hand for people using condenser mics straight to camera. The boxes do not attenuate the signal they simply power the mic. Common brands are Denecke, PSC, and ASC.

-Brian