Info on Toshiba Opti Cartridge plz?

Steerpike · 20th May 2006, 10:46 PM

Hi All
I have just acquired this NOS "Toshiba OPTI" cartridge, which I have been led to believe may be an interesting type in that it used a modulated light beam and photodiode to translate stylus movement into electrical signals.
Does anyone have any info on it, specifically as regards the electrical connections & pinouts?

anar · 21st September 2006, 01:52 PM

Hi,

First of all I must say that I know nothing about electronics and technical stuff. I'm only a old LP record fan that like to play his favorite tunes on old hardware (amp and turntables).

If this info can help you, I am pretty sure that your cartridge is designed for the Toshiba Opti TR-50 turntable. I think you should try to get info about the TR-50. I was unable to fing good infos on the web yet. If you can find some, I would be interested.

I wonder where you got your cartrige from ? I just bought a TR-50 without original cartridge so I'm looking for one. If you want to sell it...

Regards,

Anar

Steerpike · 22nd September 2006, 09:39 PM

What I have learned about this cartridge is that it requires a special preamplifier, with non-RIAA equalisation, as well as an uncommon input configuration.
The cartridge contains two photodiodes, so does not generate any voltage as do ceramic or magnetic cartridges. Instead, the generator acts as a variable current source, and as such needs an excitation potential. Further, the cartridge requires 2V at 200mA or so to illuminate the phototransistors.

EC8010 · 23rd September 2006, 09:17 AM

The cartridge will be an amplitude transducer rather than a velocity transducer (magnetic cartridges), so a perfect transducer would only require a shelf equaliser with time constants of 318us and 75us.

Netlist · 23rd September 2006, 04:18 PM

You will be happy to find this bit of info on the Toshiba cartridge.
http://www.badenhausen.com/VSR1Pickups.htm

/Hugo

bulgin · 24th September 2006, 09:54 PM

Hi Moderator netlist

Thanks for the interesting and educational link you posted regarding diyaudio member steerpike's query re this cart. Will it be OK if I draw our friends at VE's attention to your post?

Regards

bulgin

23rd September 2006, 09:17 AM	#4
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	The cartridge will be an amplitude transducer rather than a velocity transducer (magnetic cartridges), so a perfect transducer would only require a shelf equaliser with time constants of 318us and 75us. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

24th September 2006, 09:54 PM	#6
bulgin diyAudio Member Join Date: May 2006	Info on Toshiba Opti Cartridge plz? Hi Moderator netlist Thanks for the interesting and educational link you posted regarding diyaudio member steerpike's query re this cart. Will it be OK if I draw our friends at VE's attention to your post? Regards bulgin

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21st September 2006, 01:52 PM	#2
anar diyAudio Member Join Date: Sep 2006	Hi, First of all I must say that I know nothing about electronics and technical stuff. I'm only a old LP record fan that like to play his favorite tunes on old hardware (amp and turntables). If this info can help you, I am pretty sure that your cartridge is designed for the Toshiba Opti TR-50 turntable. I think you should try to get info about the TR-50. I was unable to fing good infos on the web yet. If you can find some, I would be interested. I wonder where you got your cartrige from ? I just bought a TR-50 without original cartridge so I'm looking for one. If you want to sell it... Regards, Anar

22nd September 2006, 09:39 PM	#3
Steerpike diyAudio Member Join Date: Jan 2006 Location: Johannesburg, South Africa	What I have learned about this cartridge is that it requires a special preamplifier, with non-RIAA equalisation, as well as an uncommon input configuration. The cartridge contains two photodiodes, so does not generate any voltage as do ceramic or magnetic cartridges. Instead, the generator acts as a variable current source, and as such needs an excitation potential. Further, the cartridge requires 2V at 200mA or so to illuminate the phototransistors.

23rd September 2006, 04:18 PM	#5
Netlist diyAudio Moderator Join Date: Jan 2003	You will be happy to find this bit of info on the Toshiba cartridge. http://www.badenhausen.com/VSR1Pickups.htm /Hugo

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