Koetsu

[Ralphio]

Currently any new or rebuilt Koetsu mono cartridges, be them stone or wood bodies, are supplied with aluminum cantilever and specified at approx. 3g tracking force. I'm not sure of the stylus profile but will snap a micro photo and post it.
This thing tracks beautifully on the AMG arm but am going to give it a ride on newly acquired Glanz MH-124S once I get an armboard sorted.

​ View larger image

Koetsu Mono Rosewood Signature Monaural MC Stereo Cartridge Made in Japan​ Purchase number: Pieces This product will be backordered purchase I would like to order ​ Inquire about this product

specification​

Power generation method: MC
Output voltage: 0.4mV
Appropriate stylus pressure: 3.0g (standard)
Internal impedance: 5.5? Own
weight: 11g
Coil wire: High-purity copper
Magnet: Samalium cobalt
Cantilever: Aluminum
Body: Purple Dan & Clear

 

[Nemal1]

Thanks for the update Ralphio. Enjoy

 

[Anil Kalagatla]

Hi Koetsu experts:

I recently got a retipped/rebuilt Onyx Platinum and am trying to mount on my Schroeder CB-9 tonearm with its standard headshell. This is the old style cartridge with unthreaded screw holes, which requires adding nuts to secure it. I'm running into an issue (probably newbie) where I don't have enough room to set up the cartridge so it's tangential at the null point (using a Smartractor). It's probably because the nuts and/or the screw heads are just a little too big to allow the full movement. I was curious if there are better ways to attach the cartridge - are there shallower profile screws/nuts that I can use? BTW, the screws are upside down since there's no room underneath for attaching nuts; I don't understand the design as you *have* to use nuts to secure it, but it does not have as much clearance for them. Not sure how these used to attached without the required clearance.

Thanks!
Anil

 

[jadis]

Currently any new or rebuilt Koetsu mono cartridges, be them stone or wood bodies, are supplied with aluminum cantilever and specified at approx. 3g tracking force. I'm not sure of the stylus profile but will snap a micro photo and post it.
This thing tracks beautifully on the AMG arm but am going to give it a ride on newly acquired Glanz MH-124S once I get an armboard sorted.

​ View larger image

Koetsu Mono Rosewood Signature Monaural MC Stereo Cartridge Made in Japan​ Purchase number: Pieces This product will be backordered purchase I would like to order ​ Inquire about this product

specification​

Power generation method: MC
Output voltage: 0.4mV
Appropriate stylus pressure: 3.0g (standard)
Internal impedance: 5.5? Own
weight: 11g
Coil wire: High-purity copper
Magnet: Samalium cobalt
Cantilever: Aluminum
Body: Purple Dan & Clear

Is this rebuilding using aluminum cantilever done by Koetsu Japan?

 

[jadis]

Hi Koetsu experts:

I recently got a retipped/rebuilt Onyx Platinum and am trying to mount on my Schroeder CB-9 tonearm with its standard headshell. This is the old style cartridge with unthreaded screw holes, which requires adding nuts to secure it. I'm running into an issue (probably newbie) where I don't have enough room to set up the cartridge so it's tangential at the null point (using a Smartractor). It's probably because the nuts and/or the screw heads are just a little too big to allow the full movement. I was curious if there are better ways to attach the cartridge - are there shallower profile screws/nuts that I can use? BTW, the screws are upside down since there's no room underneath for attaching nuts; I don't understand the design as you *have* to use nuts to secure it, but it does not have as much clearance for them. Not sure how these used to attached without the required clearance.

Thanks!
Anil

View attachment 89778View attachment 89779View attachment 89780

I would imagine that you should loosen the top bolt and move or adjust the offset.

 

[Ralphio]

Yes, Koetsu Japan. Pre-rebuild the cartridge was a stereo variant with boron cantilever and fine-line stylus but I decided to go mono for this segment of it's life cycle. When I ordered the rebuild through dealer I was advised that the aluminum cant is standard for mono.

 

[Solypsa]

Hi Koetsu experts:

I recently got a retipped/rebuilt Onyx Platinum and am trying to mount on my Schroeder CB-9 tonearm with its standard headshell. This is the old style cartridge with unthreaded screw holes, which requires adding nuts to secure it. I'm running into an issue (probably newbie) where I don't have enough room to set up the cartridge so it's tangential at the null point (using a Smartractor). It's probably because the nuts and/or the screw heads are just a little too big to allow the full movement. I was curious if there are better ways to attach the cartridge - are there shallower profile screws/nuts that I can use? BTW, the screws are upside down since there's no room underneath for attaching nuts; I don't understand the design as you *have* to use nuts to secure it, but it does not have as much clearance for them. Not sure how these used to attached without the required clearance.

Thanks!
Anil

Which geometry are you using?

 

[dave slagle]

Hey Anil,

I have also run into this with the schröders. I can't tell what the head of the mounting screw looks like but if you invert them you may get a little more rotation. What you really need is mounting screws with a nut like the one pictured below. I have also had good luck using threaded inserts as nuts in this situation which can be quickly sourced via amazon. The 6mm long ones in the link may be long enough to allow you to remove the knurling on the bottom with a file and get the last little bit of rotation.

dave

 

[Anil Kalagatla]

Which geometry are you using?

Loefgren B DIN (which I think is the default for this tool).

 

[Anil Kalagatla]

Hey Anil,

I have also run into this with the schröders. I can't tell what the head of the mounting screw looks like but if you invert them you may get a little more rotation. What you really need is mounting screws with a nut like the one pictured below. I have also had good luck using threaded inserts as nuts in this situation which can be quickly sourced via amazon. The 6mm long ones in the link may be long enough to allow you to remove the knurling on the bottom with a file and get the last little bit of rotation.

dave

View attachment 89784

Great, thanks Dave! I will definitely check these out. Do you happen to remember what these are called, so can I search on Amazon? Now that you mentioned filing, it gives me an idea to see if I can knock off some corners of the nuts to give the cartridge mounting plate a little more room to swivel.

Anil

 

[Anil Kalagatla]

I would imagine that you should loosen the top bolt and move or adjust the offset.

Hi jadis: the issue is that even if loosen the top bolt (which I have done to move the plate) I don't have much room to "straighten out" the mounting plate so it's nicely parallel to the grid lines.

Anil

 

[dan31]

Can you reverse the bolt/nut to be bolt through top and nut on the bottom? My Koetsu mounting hardware is rounded. Both the bolt and nut. The nut has a cut for a flat screwdriver. Very slim.

 

[jadis]

Hi jadis: the issue is that even if loosen the top bolt (which I have done to move the plate) I don't have much room to "straighten out" the mounting plate so it's nicely parallel to the grid lines.

Anil

I see. So it's about changing into a smaller nut as some have mentioned here, or put the nut the the bottom. Somehow I had managed to do that a few times with the Black and Rosewood which have no threads too. Good luck.

 

[Anil Kalagatla]

@dan31, @jadis: unfortunately the nut I have does not fit in the bottom. Unfortunately it's *just* barely too big I probably need to find smaller sized ones.

Anil

 

[dave slagle]

Anil,

They are simply called threaded inserts. The amazon link in my above post takes you to an assortment for $12. The forum software does not make the clickable link very obvious so it is included below.


Threaded Inserts

 

[Anil Kalagatla]

Anil,

They are simply called threaded inserts. The amazon link in my above post takes you to an assortment for $12. The forum software does not make the clickable link very obvious so it is included below.


Threaded Inserts

Great, thanks!

 

[dan31]

You need some new hardware.

Koetsu-Mounting Hardware Packets-Turntable Set Up Tools|Acoustic Sounds

Acoustic Sounds Audiophile Vinyl Records

store.acousticsounds.com

 

[Anil Kalagatla]

You need some new hardware.
View attachment 89796

Koetsu-Mounting Hardware Packets-Turntable Set Up Tools|Acoustic Sounds

Acoustic Sounds Audiophile Vinyl Records

store.acousticsounds.com

Nice, this seems to include the round ribbed nuts, similar to what Dave was mentioning. Out of stock at AcousticSounds, but gives me ideas for what else to search for...

Anil

 

[UEM]

Ralphio,

What exactly did you - or your expert craftsman – perform to change the system to Mono ?


Thanks
& regards

Urs

 

[Yeti]

The Ortofon SPU N series come with some round nuts slotted for a peg drive. As best as I can tell in situ they’re the same diameter as the screw heads at 4.5mm. I don’t see them available separately from Ortofon but something similar can be found with a web search for cartridge mounting kit.