Ooops! Wrong again!The W66 is passive so its input and output impedance is the same (200 Ohms)
Ooops! Wrong again!The W66 is passive so its input and output impedance is the same (200 Ohms)
Well it does not have to be precisely 20 Ohms, just the lower the better.how I can achieve 20 ohms and 200 ohms without transformers
Yes, and i NEVER knew that!your EQs are 86a, which are inductor based. Mine are 86, they are RC
Back then Eckmiller also supplied transformers (CT10/11) in case they were not used together, to present a required impedance. But I have never seen one, sadly; using them strapped together was always very convenient, and cost-saving solution I guess.[...TS10] So I bought on unit of each because I knew even then that they were built to be used only in conjunction with one another. They as well are completely passive but since they do only cut, they do not require a 34 dB boost. So I racked them and fed them into a Maihak W66. The resonances were so clearly audible, I did not even have to make any measurements. I was so disapointed and sold them emidiately.
Amazing! Please tell me you also saved documentation of the console (...and intend to scan it someday)?Gosh, am I lucky to have stumbled onto this thread! Great infos (thank you thomasdf!) and @ Rock: What a wonderful leaflet!!!
When I started work at NDR in Hamburg there was still one small studio equiped with Siemens V72, TAB V76, Maihak W87 and Eckmiller EQs. When it went out of comission I was lucky enough to be able to buy the console and it´s serving me to this very day - longer than it has served German Radio by now and without one day of failiure.
(I could not blame you if you accused me for boasting, so: Sorry in advance!)
Yes I didPlease tell me you also saved documentation of the console
Why not? But it is many big sheets of paper because they painted a new block diagramm with each modification ... in ink ... by hand. Ooo, all the work they put into it! So of course I wouldn´t want to spoil their legacy and continued to record every alteration I made.(...and intend to scan it someday)?
Aaah! I didn´t know that eighther! I always wondered how there could only be a TS10 in the side rack to an old console of "Deutsche Phonogramm" that a friend of mine owns, without the adjacent HS10 - well, that explains it, thanky you!Back then Eckmiller also supplied transformers (CT10/11) in case they were not used together, to present a required impedance.
That is absolutely amazing! I would gladly help with scanning that if you can't or don't have time to do so (I have a small scanner but can stitch the images in Photoshop together, no problem with that). Or I can clean and stitch the scanned images, whatever suits you (PM me). I can also understand you won't want to bother with that at this time, it is some work, but please don't throw it away...Yes I did
And luckily so, because at the NDR the thing had been changed so many times and I would have been at a loss to know left from right.
Why not? But it is many big sheets of paper because they painted a new block diagramm with each modification ... in ink ... by hand. Ooo, all the work they put into it! So of course I wouldn´t want to spoil their legacy and continued to record every alteration I made. [...]
Malotki V71/V71a are very rare, and information on them is also pretty rare as well esp. information on different revisions (V71 w/ 19/34dB Switch, V71 w/out Switch, V71s, V71u)...Aaah! I didn´t know that eighther! I always wondered how there could only be a TS10 in the side rack to an old console of "Deutsche Phonogramm" that a friend of mine owns, without the adjacent HS10 - well, that explains it, thanky you!
That console - by the way - does contain the V72´s little brother: the V71.
Siemens Sitral V272 would be a good match, and still affordable?[...] I need a 34dB makeup amp after them (or before, from what I read it can bring a nice color). The thing is they are passive, balanced and need to be fed and drive symetrical signals. I am wondering what path I could follow.
Back then it was designed to be used with a V72 but that's out of my budget and I would like the amp to fit in a 1U rack unit.
I have 2520 makeup boards that would need both an input and output transformer
I thought of giving the Neve BA283 a try, too.[...]
As I have some spare time this summer I am starting to rethink about this project and your input is much welcome, and enlightening. If I am understanding correctly I need to feed the EQ a precise load, and they need to see a precise load at their output, right ?May I draw your attention to page 8 of the lovely leaflet? They give specific information about the source and load impedances and they are tremendously importand if you want your Eckmillers to work properly!
Since they are completely passive, they interact heavily with the source by that they are driven and with the load that they themselves drive.
@ thomasdf:
And for that reason it is of the utmost importance, that you use the W86 in an environment where they are driven by a source impedance of ca 20 Ohms or less (a V72 does precisely that) AND where the load is ca 2 kOhms (V72 again) but not more than the stated 4 kOhms. The trouble with buffer amps with an input transformer might be, that it might lean too much towards being an inductive load, which will alter the frequency curves of your W86. You´d be much more on the save side if you used an op-amp-buffer with a high input impedance and strapped 4,7 kOhms across the input.
All these old German modules were built to interact with one another and the passive Eckmiller-EQs even more so!
A little on the expensive side for my wallet, but classy for sure !Siemens Sitral V272 would be a good match, and still affordable?
Yes, that´s what i meant. Easiest way would be:If I am understanding correctly I need to feed the EQ a precise load, and they need to see a precise load at their output, right ?
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