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W85 passive fader [message #215425]

Thu, 25 January 2007 07:58

maxdimario
Messages: 3811
Registered: December 2004

Platinum Member

I have a dozen or so W85 passive faders and was wondering how they were hooked up in the original 50's IRT consoles.

is there only one type of W85?

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Re: W85 passive fader [message #216306 is a reply to message #215425 ]

Sun, 28 January 2007 18:33

maxdimario
Messages: 3811
Registered: December 2004

Platinum Member

one thing I notice is that the impedance is very low (250 ohms) both in and out.

I have seen that 200 ohm resistors are soldered in line symmetrically on the input.. therefore raising the impedance to 650 ohms.. but that causes a drop in volume..

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Re: W85 passive fader [message #216739 is a reply to message #215425 ]

Tue, 30 January 2007 10:15

Oliver Archut
Messages: 618
Registered: April 2004

Gold Member

Hello Max,

there were several different versions of Danner/Eckmiller type of faders. The very early ones that are build of single resistors and the later carbon type ones. Both of them have their charm, I like the resistor type better but the dB range is limited with either 75 or 85dB range, were the carbon type have a 90dB range that is still better than most of the fader out there today.
I saw a few export versions here in the US with 600 Ohm impedance, but as far as I know they were either 200/300 Ohm for european use.
Best way is to use them with IRT specked mixing units like the V75, V2(3)75, etc. than you won't have any level issues. The resistor in front of it will change the frequency response as well the noise level, but if you do not have any other way of doing it... It works to a point.

Best regards,

Oliver Archut
www.tab-funkenwerk.com

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Re: W85 passive fader [message #216762 is a reply to message #215425 ]

Tue, 30 January 2007 11:28

maxdimario
Messages: 3811
Registered: December 2004

Platinum Member

these are from a DG console, they go to 85 dB using single resistors...

I have two v103's 6 to 1 mixers which I want to use..

the v103's have a high input impedance so it's not so much of a problem, but placing the fader inline reduces signal by a few dB..

why was european standard 300 ohms, but V-series 2Kohm/200 ohm?

what is the lowest impedance a V72 can drive within spec?

were they made for 300 ohms?

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