416T powering

Soundpod1.TakeThisOut@iprimus.com.au wrote:
> Hi All,
>
> I recently purchased a Sennheiser 416T. There is a note in the case
> that states.
> "Please Note: This MKH416TU has Pin 3 = +12v. Pin 2 = -12v. Pin 1 +
> Shield/Ground. This is not standard wiring."
>
> This raised many questions that I was hoping some here could help
> answer. My reading on T power tells me that Pin 3 = -12v & Pin 2 =
> +12v.
> Therefore is there any marking on the mic itself that indicates if it
> is a 416T or 416TU? Inside the connector it just has MKH 416 and the
> serial #. And will damage occur if I get this wrong?
>
> As this is my first post I would also like to add that this is a great
> group and I refer to it all the time. Its an invaluable knowledge base
> and community and I think the exchange of ideas and opinions helps us
> all.

Nick,

First, welcome to the group. Second, when I got my first Schoeps a few
years back, it had a CMC4 preamp, which is the T powered version.

I set my mixer to T power and plugged the Schoeps in. It didn't work.
I tried it in a friend's mixer, it didn't work there, either. At the
time, I was unaware that Nagras used a reverse wiring scheme when
powering T powered mics. In speaking to the person who had sold me the
mic, he mentioned that he had used it with his Nagra which had a reverse
polarity to standard T power.

I simply reversed the leads (pin 2 and pin 3 in the connector) and it
worked great, having suffered no ill effects from having been plugged
into the reverse wiring.

Sennheiser mics tend to be even more robust than Schoeps so, if it were
me, I wouldn't be too worried about trying it backwards. However,
that's not a guarantee and I'll take no responsibility if it goes up in
a flames taking the house and half a city block with it.

Kinda like, if you've seen the original "Mission Impossible" series:
"If captured or killed the secretary will disavow any knowledge of your
mission. Good luck, Jim."

So... "Good luck, Nick."

John Blankenship, C.A.S.
Indianapolis
(email: my initials at mw daht net)


 >> Stay informed about: 416T powering 

Soundpod1 RemoveThis @iprimus.com.au wrote:

>Hi All,
>
>I recently purchased a Sennheiser 416T. There is a note in the case
>that states.
>"Please Note: This MKH416TU has Pin 3 = +12v. Pin 2 = -12v. Pin 1 +
>Shield/Ground. This is not standard wiring."
>
>This raised many questions that I was hoping some here could help
>answer. My reading on T power tells me that Pin 3 = -12v & Pin 2 =
>+12v.
>Therefore is there any marking on the mic itself that indicates if it
>is a 416T or 416TU? Inside the connector it just has MKH 416 and the
>serial #. And will damage occur if I get this wrong?
>
>As this is my first post I would also like to add that this is a great
>group and I refer to it all the time. Its an invaluable knowledge base
>and community and I think the exchange of ideas and opinions helps us
>all.
>
>Nick G
>
>
>
Hi Nick:

A 416 TU has an XLR connector at the base, and a 416T has , I believe, a
Tuchel 3 pin. Maybe this is the difference?
Also, I remember when I worked in the late 70's at CBC, we had power
supplies which were different for various types of T powered
Sennheisers. The difference if I recall correctly was polarity, which
may explain your note. Often either the 816, or 416 had to be polarity
reversed to match certain inputs.
I'll betcha Glen Trew may have an answer to this question, maybe more
precise than I can offer.

Regards,

Jim Rillie
 >> Stay informed about: 416T powering 

"> Nick,
> The Nagra IV-L required reverse polarity T powering. The mics wired for
> the older Nagra QPC-3.5 preamps were known as "Red Dot". They usually had
> a red dot on the side of the barrel near the XLR plug. If you want to
> re-wire the connector you can have someone at one of the Sound Rental
> Houses reverse the polarity for you.
>
> ---Courtney
>
>
Because that issue I know 20 sennheisers where rewired in some place I
served in the 80:-)

--
Oleg Kaizerman (gebe) Hollyland
 >> Stay informed about: 416T powering 

Just a side note. If you ever choose to use a 48V to T converter
barrell. Make sure to plug the converter into the 48V supply before
plugging in the microphone. I was well aware of this rule, but decided
to defy it while in a hurry on set one day. Bad idea. I had to ship
the mic for repairs.

Scott
 >> Stay informed about: 416T powering 

What mic was it and how was it damaged? I've been using 48-to-T
adapters for years, maybe I've just been lucky.

Philip Perkins
 >> Stay informed about: 416T powering 

Didn't know that. Thanks. One T-powered mic left in my kit, one of my
816s.

D.


<scottclem.RemoveThis@aol.com> wrote in message
news:1118584794.444480.31300@g14g2000cwa.googlegroups.com...
> Just a side note. If you ever choose to use a 48V to T converter
> barrell. Make sure to plug the converter into the 48V supply before
> plugging in the microphone. I was well aware of this rule, but decided
> to defy it while in a hurry on set one day. Bad idea. I had to ship
> the mic for repairs.
>
> Scott
>
 >> Stay informed about: 416T powering 

Philip Perkins wrote:
> What mic was it and how was it damaged? I've been using 48-to-T
> adapters for years, maybe I've just been lucky.
>
> Philip Perkins

It was a 416. Could have just been its age, but it blew some
capacitors in the mic. Repairs weren't but about $100, but $$ and
anoying all the same. I was warned about this when I bought at
Location Sound.

I had the adaptor plugged into the 416 and mounted in a shockmount.
Plugged up and tested fine for a wireless plant. I was in a hurry to
adjust the plant as they were about to roll, and needed to unplug the
cable from the adaptor. To unplug the adaptor from the mic would have
meant remounting, and as they were yelling "roll sound", I just plugged
the cable right back into the adaptor, ran to the cart, and no mic.
Back in my utility/ boom days I would have never taken that risk with
someone elses gear, but with mine I figured "what harm could come".
Now I know.

Scott
 >> Stay informed about: 416T powering 

exchangin pins 2 and 3 would reverse the sound's polarity, right? its
usually not an issue, but with transformerless inputs on the new
mixers, that could create some polarity problems, especially when the
mic is mixed with something close, e.g. 2nd boom or lav.

Balazs Rozgonyi
R-Provideo Hungary
 >> Stay informed about: 416T powering 

rprovideo.DeleteThis@axelero.hu wrote:
> exchangin pins 2 and 3 would reverse the sound's polarity, right? its
> usually not an issue, but with transformerless inputs on the new
> mixers, that could create some polarity problems, especially when the
> mic is mixed with something close, e.g. 2nd boom or lav.

Yes, that would reverse the sound's polarity from what it is now,
however that doesn't necessarily mean that it will be out of phase with
your other mics. That's something you should check. The "Nagra wiring"
of T-power might have the phase reversed to begin with, I'm not sure.
You need to compare it with your other mics.

The fact that it's transformerless should not have any bearing on the
phase. It's all about whether a postitive pressure wave on the diaphram
will create a positive voltage swing on pin 2 referenced to pin 3. But,
put in real world terms, you want all your mics to be in phase with each
other.

John Blankenship, C.A.S.
Indianapolis
(email: my initials at mw daht net)


 >> Stay informed about: 416T powering 

> Back in my utility/ boom days I would have never taken that risk with
> someone elses gear, but with mine I figured "what harm could come".
> Now I know.
>
> Scott
>
Wait. You mean that utility/boom days actually go away and become mix only
days at some point?
Whew. Good to know. I'll put the gun away now.
 >> Stay informed about: 416T powering