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Kenwood Direct Drive - Oiling the Bearing

snap, crackle and pop

Postby W8AAZ » 01 Nov 2009 15:00

Wow and flutter are measurable quantities in turntable performance. Would be interesting if you could show an improvement in performance with a W & F meter from doing something like that. Some sort of hi tech teflon based grease would be interesting to experiment with also, if the concern is that the oil would migrate out of the bearings, eventually.
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Postby caligari » 01 Nov 2009 17:45

Cobra2 wrote:I did not care too much about them, mostly because of the tone-arm. And because my SP-10MkII would eat them for breakfast...



What is wrong the Kenwood tonearm? It's well engineered and well designed. The armtube is ingenious with internal I-beam construction. And the vertical bearings also high quality with a wide fulcrum. I love the construction and it sure looks cool. I got great result using Signet or Audio Technica cartridges. Why must we always have to subject to Rega arms - that grey boring sound? Why must we always have to think the Rega is an automatic improvement over any arm from an integrated turntable. In my experience, they are not often the case. I prefer the stock arm on my JVC QL-7 over other more expensive arms. The SP10 has higher torque so naturally the bass and drive is more forceful than the Kenwood's low torque (DD standard wise) but the KD-770D has that sense of fluidity that only a good belt-drive can match but the Kenwood has the stability and precision over BD tables. I like it so much that I sold my SP10mk2. Hell, I have three SP10s and sold them all. The Kenwood's wonderful coreless motor has the smoothness in the texture that Technics cannot match and try to play a solo violin record and you will know what I mean. If you don't want your KD-990, let me know. I will buy them from you. I would even buy just the tonearm from you.

Hugo, thank you so much for posting these wonderful innards pictures so I know what to mod next time. Great thread.
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Postby Hugo » 01 Nov 2009 18:10

caligari wrote:Hugo, thank you so much for posting these wonderful innards pictures so I know what to mod next time. Great thread.


My pleasure! The Kenwood has been playing all day, and it's wonderful. It always was wonderful, but now it's more so! I need to be a bit careful about keeping the bearing oiled, but I have a friend who's handy with machining and metal work, and I'm sure we can come up with something that will keep the oil in!

If you want a really huge mod for the Kenwood, then bypass the crude PSU regulation on the circuit board and implement something better engineered. All you need is a finely regulated 23.4v DC supply, and the skills to unsolder a couple of components and to attach two wires. The Service Manual here on VE has the circuit schematics, and it's easy to work out what needs to go where. I use a Paul Hynes Design PSU (see http://www.paulhynesdesign.com) but it's not difficult to knock up something that's way better than what Kenwood used originally. A beefier and properly regulated PSU does lift the KD-770D's performance by quite some margin, in exactly the same way as it would a Technics SL-1200's.
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Postby Shoji » 01 Nov 2009 18:47

Hello Hugo. it is pleasing to see the result and you are enjoying the flow of music. May be you able to locate thin flat section o-ring for using as seal if decide to keep oil in use ? If you have the interest is possible I may ask some one I have contact of for sample of the grease so you may like to use and make the compare with oil viz new grease ?
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Postby Hugo » 01 Nov 2009 18:53

Shoji wrote:Hello Hugo. it is pleasing to see the result and you are enjoying the flow of music. May be you able to locate thin flat section o-ring for using as seal if decide to keep oil in use ? If you have the interest is possible I may ask some one I have contact of for sample of the grease so you may like to use and make the compare with oil viz new grease ?


That's very kind of you. I would be very pleased to have a sample of this grease for comparison.
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Postby caligari » 01 Nov 2009 19:59

Hugo wrote:
caligari wrote:If you want a really huge mod for the Kenwood, then bypass the crude PSU regulation on the circuit board and implement something better engineered. All you need is a finely regulated 23.4v DC supply, and the skills to unsolder a couple of components and to attach two wires.


Thank you for the tips. I am always in search of a DD turntable candidate that I can do some mods that I can take the motor out and mount it to a different plinth that is more solid and more compact and the run umbilical cords to the control electronics and power supply in a separate enclosure. The simplicity of the KD-770D seems like a good candidate. Inspired by the Monaco turntable. In fact, I believe all DD tables can be improved this way if we separate the motor away from the electronics and power supply. I used to do that to Pioneer turntables but they simply don't sound as smooth as I would like so I on the look out for different candidates. Once I get that set up, I will try the psu upgrade. Even in stock form, the KD-770D is a wonderful turntable as is.

Fun thread!!
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Postby Hugo » 01 Nov 2009 22:53

caligari wrote:....... I am always in search of a DD turntable candidate that I can do some mods that I can take the motor out and mount it to a different plinth that is more solid and more compact and the run umbilical cords to the control electronics and power supply in a separate enclosure. .............

Fun thread!!


You must be reading my mind! This is exactly what I am planning to do, perhaps with an acrylic chassis.
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Postby caligari » 04 Nov 2009 20:57

In Japan there's a whole cult of people modding the Kenwood KP-1100 direct-drive turntable or KD-990 in the States. Mainly by stripping the wood cabinet and exposing the skeletal structure and maybe add another tonearm or more to it. Really cool projects. Taking the same concept I would like to do that to one of my turntables like that. Here are some cool pictures.


http://www.niji.or.jp/home/k-nisi/kp-1100.htm

http://k-nisi.hp.infoseek.co.jp/kp-880d.html


http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%203/myaudio3.html

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%203/kp&kp.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%203/kp11001.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%203/kp11002.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%203/kp11003.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio1/9010.jpg

[/url]http://home.j08.itscom.net/studio-k/tcn-catv/myaudio1/9010a.jpg[/url]

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio1/9010b.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio1/9010c.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio1/9010+ma505.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%202/threearms.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%202/9010d.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%202/ixos.jpg

http://home.j08.itscom.net/studio-k/tcn-catv/myaudio%202/P1010004.JPG


http://yosigaki.s214.xrea.com/ulpapa.html

http://yosigaki.s214.xrea.com/slowhand2.html

http://yosigaki.s214.xrea.com/giri.html

http://yosigaki.s214.xrea.com/tetu.html

http://yosigaki.s214.xrea.com/nasukawa.html
[/url]

[url]http://yosigaki.s214.xrea.com/yamamotosan9010a.jpg
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[url]http://yosigaki.s214.xrea.com/yamamotosan9010b.jpg
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Postby caligari » 04 Nov 2009 20:58

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Postby Cobra2 » 05 Nov 2009 12:12

And you will notice that they all add another (or more) tonearm...

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Postby Hugo » 05 Nov 2009 14:36

caligari wrote:In Japan there's a whole cult of people modding the Kenwood KP-1100 direct-drive turntable or KD-990 in the States. Mainly by stripping the wood cabinet and exposing the skeletal structure and maybe add another tonearm or more to it. Really cool projects. I would like to do that to one of my turntables like that.


Sadly, the KD-770D is a 'poor relation' of the skeletal chassis models, having a plain chipboard plinth, to which the motor unit is bolted. The motor unit and control board are the same though.
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Postby Shoji » 05 Nov 2009 14:52

Hello Hugo. Motor plus control is different. Motor series DDM look much same but is different. Motor in model KP-1100 is highest specification of DDM series. KP designation is Japan only model. Other market model mostly KD designation. Please in addition also I send PM for mention of grease.
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Postby caligari » 05 Nov 2009 16:28

I suspected the motor on the KD-770D is different from the KP-1100 or KD-990 since the pc board's attached the motors are different from each other. Doesn't matter. The idea is still inspirational as I intend to pull a motor (not necessarily from the Kenwood, it can be any DD motor) out to mount that to some kind of solid structure separate from all the electronics and power supply. I have some round butcher blocks that I can bolt the motor on to and have a cantilevered style arm-board for tonearm. And the idea of allowing for a second or third tonearm is very tantalizing. It can be fun!
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Postby caligari » 05 Nov 2009 16:33

You will notice in one of the pictures, the motor in the KP-1100 allows for adding oil. Since the motor in the KD-770D is similar I wonder why it couldn't be done....

http://yosigaki.s214.xrea.com/repair-7.jpg
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KD-770D Headshell

Postby Chazzer » 05 Nov 2009 20:34

Please Gentntlemen, Can someone help me locate a original headshell for my KD-770D. I have searched high and low but cannot locate one. In fact I have not even come across another angled headshell that will attach to the tone arm.
Mucho Thanks, Jim
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