Help from our japanese friends needed - Victor/ JVC ARM-1000 mistery

[be.audiophil]

Some time ago I acquired a JVC/ Victor Arm-1000. What attracted me was the dynamic effect of the tracking force and the fact that almost nothing seems to be known about the tonearm. Unfortunately, this is now taking its revenge, because all the documentation I could find about it is only available in Japanese writing.

It's about this little rarity



















So I need some translation help of someone with japanese language skills please.

This are the broshure scans and other documentation I´ve found so far









Unfortunately what I interpreted to stand for overall length (351 mm), effective length (247 mm) and overhang (5 mm) won´t match. Within the coloured scans effective length seems to be 340 mm instead of 351 mm. And what stand 245 mm in the black and white scan for?

Please can anyone bring some light to the darkness?

[willbewill]

what stand 245 mm in the black and white scan for?

= Slide base moving range


from colour pics:
Overall length 340 (the same in all 3 pics)

No I don't read Japanese but google lens does  

[Lynnot]

Hi Rolf,

you might try it at a regular 245mm mounting distance with 15mm overhang.
See wether cartridges can be alligned in that geometry.

Best regards, Tony

[be.audiophil]

Thanks a lot

so, 245 mm will be the middle position in the sliding base.

you might try it at a regular 245mm mounting distance with 15mm overhang.
See wether cartridges can be alligned in that geometry.

Where do 15 mm overhang come from? Those broschures always say 5 mm.

[Lynnot]

Hi Rolf,

all the other and newer Victor tonearms use the old japanese geometry with 245mm mounting distance with 15mm overhang.
It would be odd if this one is different. A quick check with a standard cartridge/ headshell combination will show.

Put on 245mm mounting distance and with the headshell mounted it will show an overhang of (about) 5mm or (about) 15mm.

So you will be able to tell.


Best regards, Tony

[stratokaster83]

Hi Rolf,

all the other and newer Victor tonearms use the old japanese geometry with 245mm mounting distance with 15mm overhang.
It would be odd if this one is different. A quick check with a standard cartridge/ headshell combination will show.

Put on 245mm mounting distance and with the headshell mounted it will show an overhang of (about) 5mm or (about) 15mm.

So you will be able to tell.


Best regards, Tony

I believe the common Japanese geometry is 230mm mounting distance and 15mm overhang for 245mm effective length.

[wenig watt]

Fidelity Research Standard With SAEC it is different for each arm....

Best regards

Arndt

[wenig watt]

Vinyl Engine JVC Arm 1000:

Effective Length
237 mm
Overhang
15 mm
Offset Angle
22°
 
Pivot to Spindle
222 mm

[be.audiophil]

Vinyl Engine JVC Arm 1000:

Effective Length
237 mm
Overhang
15 mm
Offset Angle
22°
 
Pivot to Spindle
222 mm

Those data can´t be correct - just compare data with the ones stated the broschures

[stratokaster83]

I showed this thread to my Japanese friend, she is not familiar with audiophile terminology but she told me that the specs mention "line length 247mm, overhang 5mm, sliding base range 245mm"

Personally I think there are two possibilities:

1) effective length 247 mm with 5mm overhang (mounting distance 242mm)
2) mounting distance 247mm with 5mm overhang, i.e. 252mm effective length

Try these numbers and see if you can get a reasonable alignment with either of them.

BTW, I guess mounting the sliding base at 245mm should cover both of these cases because it seems to have 8mm of adjustment range.

[be.audiophil]

Thanks to all trying to help with data.

Luckily I´ve found an long gone ad at HiFiDo sharing some pictures of the tonear with Victor´s genuine mounting template



Mounting distance and exactly the middle position in the sliding base is 245 mm
Overhang is definetly at 5 mm
Effective length is therefore 250 mm

So nothing inline with other japanese tonearm geometry, nothing in common with later JVC/ Victor creations, Grace or Fidelity Research.