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Just got Three of these in to overhaul. Nicely built units.

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...

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.

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


dvdhawk Fri, 05/15/2020 - 09:11

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 Fri, 05/15/2020 - 12:15

Boswell, post: 464286, member: 29034 wrote: 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?

Link555 Sun, 05/17/2020 - 22:54

dvdhawk, post: 464272, member: 36047 wrote: 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.

Link555 Sun, 05/17/2020 - 23:30

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....

BohemianGr00ve Wed, 09/29/2021 - 15:54

I just obtained one of these--a mid 80s DN27A with the input and output balancing transformers, but it's got a broken power switch and a few broken faders, all the fader knobs are missing. Would anyone be able to point me to a source where I can buy replacement parts? I'm thinking besides those it'll need the electrolytics in the PSU replaced, too. Any additional advice would be greatly appreciated! 

Where are you located? In North America Digikey will have the power switch…


for the faders those are harder…if I remember correctly the originals are no longer made. I did find a 10k Panasonic  one that would fit. For the knobs I use a factory in China that can make almost any mould injection pot top


Really good customer service even for small orders. 

BohemianGr00ve Wed, 10/06/2021 - 16:10

Thanks as always, Link! I just found your other thread in modifying a few DN27As for a client who sent you six to work on—wow! Thank you for sharing your knowledge and experience with us. I’m away from my DN27 and forgot to check whilst I had it open the other day but do you happen to know if the 220v transformer has taps for 110v? If not, I’ll have to get something like a step down transformer. 220v—>110v?