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This topic comprises 2 pages: 1 2
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Author
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Topic: Soundhead upgrade DP70, FP5,6,7, 56
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Rob J. Buskop
Expert Film Handler
Posts: 111
From: Rotterdam, the Netherlands
Registered: Aug 2005
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posted 01-30-2006 04:32 PM
With all due respect to Mr. Chavez: I sent you a complete 2 A-4's long description of the Kintek principle of which I use a derivative. BACP is NOT compatible, although on my explicit inquiries I got a one sentence answer. Fearing that my writings had'nt reached their intended target, I modified the contents a bit and so thereafter I approached BACP again explicitly explaining the working priciples of a DC preloaded asymmetrical preamp and my doubts as to the marriage to the BACP unit's output. Again an answer came that said: "..DC coupled, no problem.." Unless forced to, I'd rather not go into electronic detail here, but there is no reason whatsoever to suggest that the two are compatable. A high impedance source (solar cell) which is assymmetrically coupled to a DC CURRENT amplifier in my setup, is a completely different source than the output of the BACP pre-pre, which is balanced, low impedance, and suited for other more conventional designs. The BACP pre-pre should for all intents and purposes exactly emulate the characteristics of a solar cell: Because it is the connection to the original solar input that it utilises. However this unit's output stage is very different: 1. Of Low Impedance 2. Not asymmetrical (solar is, only the connection at the preamp looks like it is symmetrical) 3. Does'nt behave in other areas as a solar cell. That it works PERFECTLY on most processor inputs has a different reason. Coupled with a design as briefly outlined above however, it will not work. Anyway this is not what the posting is about. Make yourself known if you want to join the bandwagon! Rob.
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Mark Gulbrandsen
Resident Trollmaster
![](http://www.film-tech.com/ubbmembers/72d.jpg)
Posts: 16657
From: Music City
Registered: Jun 99
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posted 01-30-2006 07:23 PM
quote: Sam D. Chavez Kintek equipment has a reputation for being unreliable
Sam,
Now thats an understatement.... You're being really nice about the Kintek! I am soooo glad they are long gone!
Rob,
Your Kintek would be the first thing I would replace to bring your sound system "up to date". If its analog you prefer the Panastereo CSP-1200 has no equal or should I say nothing else even comes close. If you don't mind digital processing then the Dolby 650 is the way to go.
I've done close to 40 of the DP-70 reader conversions and have had great sucess with all of them on a variety of processors. We also split the lateral guide roller to improve lateral stability and stereo tracking as well as manufacture many parts for the DP-70 that you may find priced far more reasonably than from other sources. Xenon Lamphouse Tables, Sprockets, Gate Bands, Curved Compound Gate Runners, Motor Kits, changovers, etc.
I would much rather modernize these machines and keep them as current as possible and running as long as is possible into the future than to convert and keep the old do-do parts. Keeping that old junk in the sound reproducer(and your Kintek) is false economy and very little will be gained! However, another thing to consider is that your Kintek may not be high enough quality overall to benefit from installing the BACP(or other)scanner, there are alot of very old analog I.Cs in your processor that may not allow the full benefit of a new style reverse scan system to be realized. There are many advantages in using the BACP sacanners over the old stuff... extremely low harmonic distortion is the first that comes to mind. With about 100 DP-70's running in the Mountain states we are certainly doing our part at keeping these fabulous machines alive till the end. ![-](http://www.film-tech.com/uploads/uploads0503/BACP-3copy.jpg)
quote: Greg Mueller A few years back a film slit was offer for the DP70.
We have a full 11X14 Kodalith of those slits Greg in case you need one. Probably at least 50-60 of them....... but thats been shelved in favor of the BACP scanner.
Mark
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Rob J. Buskop
Expert Film Handler
Posts: 111
From: Rotterdam, the Netherlands
Registered: Aug 2005
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posted 01-31-2006 05:16 AM
Steve Guttag is absolutely right. Other suggestions, like capacitors after the output circuitry of the BACP amp will block the necessary small DC offset needed to get the current amp to work. There is a solution, and that is to modify the "Kintek" based design to behave like a standard balanced input preamp. Have made the calculations and all. Have tried and done that. Then it works. But that's not the point! Let me say first of all, that BACP units are, in my opinion, the best mod units available ANYWHERE!! Secondly, somebody who claims that the two principles in question do match, cannot be really an established electronics designer, they are a rare breed. Thirdly, I have no Kintek equipment at all, nor do I have a standard CP100. My preamps use a similar DC current amplifier approach as Kintek did and were expertly designed and custom manufactured and perform beautifully. No early poorly designed, unstable Dolby crap preamps for me! Again BACP is great, Sam! That's not the point. And I am not fishing in your pond either. I only mentioned that the BACP preamp does'nt adapt to unbalanced DC current amplification. That's true and electronically elementary. I can modify my elegant input stages, but hate to do that.. Some appreciation for originality in appearance and dislike of modifying circuitry that is not only lovely to look at, but is undoubtedly of excellent design, made me interested to try and find an alternative way. I wish to retain my winning horse, which is my installation as it is. So I'll work out some mods, together with some specialised brainpower that I am fortunately enough to have around me and will retain the beautiful outward appearance of the original unit as a bonus that I personally really like. Call me old fashioned and conservative. So be it. We may even fail. But not without a fight..! It's a challenge and I'll keep you posted. Thank you all for your reactions.
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