Klark Teknik DN27A- Mono 31 Band Graphic EQ

Link555

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Joined
Mar 31, 2007
Location
North Vancouver
Just got Three of these in to overhaul. Nicely built units.
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The owner had the original service manual and he was kind enough to send me photos of. The schematics available from KT online do not show the front end daughter board configuration...these do...
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IMG_8077.JPG

It has an interesting front end, no difference amp or transformer...One of the three units has a toroidal line output transformer, the other two just have RC high pass filter like shown in the above schematic.
klark-teknik-dn27a-graphic-equalizer_1_e119dd1934a8d155981a7a64d3431265.jpg


Online I found versions with an input transformer as well. Interesting....
 

dvdhawk

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Joined
Dec 18, 2008
Location
Western Pennsylvania, USA
@Link555 What exactly does an overhaul entail on one of those?

I have several very 'experienced' DN series EQs that as far as I can tell still work perfectly, but maybe they'd benefit from some new capacitors etc. They sure don't get used as much as they used to.

Klark makes the only equipment I've ever had in any of my racks that designated Pin#2 on the XLR connectors as cold (-) and Pin#3 as hot (+).
 

dvdhawk

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Joined
Dec 18, 2008
Location
Western Pennsylvania, USA
PA use only was my motto for narrowband filters.

We used our Klarks on Main FOH and Monitor Mixes and found them to be smoother than most. Our thinking was, if it's good enough for Clair Brothers... I also have a BSS Opal series I like the sound of.

Was there anything else available at the time (1985-2005) that a mere mortal could afford that was head and shoulders above Klark in live PA applications? Were we missing out on something better at roughly the same price?

We used a couple of the Klark parametrics too, which don't really fit the narrowband filter category. But do they have idiosyncrasies of their own?
 

bouldersound

Real guitars are for old people.
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Jan 23, 2010
Location
Boulder, Colorado
You might have second thoughts about that if you looked at the phase response curve of the unit!

PA use only was my motto for narrowband filters.

What does phase response sound like if you're not mixing it with a version of the same signal with different phase?
 

Link555

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Joined
Mar 31, 2007
Location
North Vancouver
@Link555 What exactly does an overhaul entail on one of those?



Klark makes the only equipment I've ever had in any of my racks that designated Pin#2 on the XLR connectors as cold (-) and Pin#3 as hot (+).

The overhaul is a recap of the power supply caps, adding Jensen input and output xfrmrs and fixing the pin3 hot thing... make pin2 the hot.
 

bouldersound

Real guitars are for old people.
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Joined
Jan 23, 2010
Location
Boulder, Colorado
If you put pin 2 hot signal into the pin 3 hot device, doesn't the signal come out the other end with the same polarity as it went in? Isn't it really only where you have a mixed balanced/unbalanced device where it matters?
 

Link555

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Joined
Mar 31, 2007
Location
North Vancouver
I know there is a lot of debate on this topic but I believe you are correct for balanced gear as. Long as the input and output are the same polarity it doesn't matter....however this unit is interesting ....depending on the model some were unbalanced, some had input transformers. And we're balanced. The units I am working are different. Two have unbalanced inputs and outputs , and one has an unbalanced input and balanced transformer output....the owners wants them all to be balanced in and out with jensen xfmrs....
 
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