Technics MC305

SY · 2nd March 2006, 12:26 PM

A vintage Technics 305 MC cartridge has arrived at the Y House, courtesy of planet10. I'm buried in the design phase of a new phono preamp to match it, but am unable to find any information on loading. Does anyone have any experience with this unit or have some magazine writeup on it which might give me a starting point?

TIA.

Netlist · 7th March 2006, 09:47 AM

A friend technician at Panasonic might be able to help if he knew of a corresponding turntable originally used with the cartridge. Assuming the 305 is a moving coil, he can only find info on MM’s at the moment.

/Hugo

SY · 7th March 2006, 10:25 AM

This was sold as a standalone, usually mounted in a headshell suitable for the EPA-250 tonearm tube. Technics made a companion step-up transformer (there was a rave review in Audio), but no step up ratio or load was specified in their literature. My own measurements suggest a 0.15-0.2mV output at 5cm/s with a 25 ohm source impedance.

If your buddy knows anywhere I could find a stylus for an EPC100C-MkIV (a MM), I can give up the whole MC notion...

analog_sa · 7th March 2006, 12:24 PM

Hi SY

Sounds like a very interesting cart with ultra low moving mass.

Why would you be too concerned with loading? 470R as a safe starting point and you should probably tweak it by ear. It may turn out to be a lot more sensitive to VTF and VTA anyway.

SY · 7th March 2006, 12:29 PM

Because loading is critical for the preamp design. Decreasing input resistance or increasing input capacitiance is easy, but going the other way might entail some major rebuilding. I'd feel more comfortable with an approximate target.

Netlist · 14th March 2006, 05:41 PM

Complete silence at Panasonic.

/Hugo

harhaug · 17th March 2006, 01:13 PM

The EPC 300MC has a low output of 0.1 mV. The matching step-up amplifier SU 300MC has a 47 Ohm load as far as I know. Look around at http://wega.we.funpic.de/technics.html for old technics material.

- Harald

SY · 17th March 2006, 05:05 PM

Muchas gracias, amigos!

2nd March 2006, 12:26 PM	#1
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Technics MC305 A vintage Technics 305 MC cartridge has arrived at the Y House, courtesy of planet10. I'm buried in the design phase of a new phono preamp to match it, but am unable to find any information on loading. Does anyone have any experience with this unit or have some magazine writeup on it which might give me a starting point? TIA. __________________ If there's a sucker born every minute, where do the rest of them come from?

7th March 2006, 10:25 AM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	This was sold as a standalone, usually mounted in a headshell suitable for the EPA-250 tonearm tube. Technics made a companion step-up transformer (there was a rave review in Audio), but no step up ratio or load was specified in their literature. My own measurements suggest a 0.15-0.2mV output at 5cm/s with a 25 ohm source impedance. If your buddy knows anywhere I could find a stylus for an EPC100C-MkIV (a MM), I can give up the whole MC notion... __________________ If there's a sucker born every minute, where do the rest of them come from?

7th March 2006, 12:29 PM	#5
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Because loading is critical for the preamp design. Decreasing input resistance or increasing input capacitiance is easy, but going the other way might entail some major rebuilding. I'd feel more comfortable with an approximate target. __________________ If there's a sucker born every minute, where do the rest of them come from?

17th March 2006, 05:05 PM	#8
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Muchas gracias, amigos! __________________ If there's a sucker born every minute, where do the rest of them come from?

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7th March 2006, 09:47 AM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	A friend technician at Panasonic might be able to help if he knew of a corresponding turntable originally used with the cartridge. Assuming the 305 is a moving coil, he can only find info on MM’s at the moment. /Hugo

7th March 2006, 12:24 PM	#4
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Hi SY Sounds like a very interesting cart with ultra low moving mass. Why would you be too concerned with loading? 470R as a safe starting point and you should probably tweak it by ear. It may turn out to be a lot more sensitive to VTF and VTA anyway.

14th March 2006, 05:41 PM	#6
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Complete silence at Panasonic. /Hugo

17th March 2006, 01:13 PM	#7
harhaug diyAudio Member Join Date: May 2004 Location: Oslo, Norway	The EPC 300MC has a low output of 0.1 mV. The matching step-up amplifier SU 300MC has a 47 Ohm load as far as I know. Look around at http://wega.we.funpic.de/technics.html for old technics material. - Harald

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