Jean Hiraga RIAA Phono

[icefox]

Hi,

WOnder if there is any pointer or expereince share on the above mentioned gear.

I understand that Hiraga has a very minimalist but nice sounding phono circuit that can be built with battery power supply.

I only heard about it, would appreciate some pointer for details.

Thanks

[ingvar ahlberg]

Hi
Jean Hiraga designed a riaa stage based on ECC83 tubes with passive riaa correction between gain stages, not battery operated of course.
He designed a MC step-up amp, simplest device ever, to my ears best step-up there is. This is battery operated, 2 lead acid 6V cells 10Ah + 2x 500 000 uF caps.
Hiraga is closely associated with Dr Kaneda and it might be the Kaneda preamp you´re thinking of. This is still one of the best preamps around, simple but hard to build as it requires extreme matching of input stage fet´s and still is hard to balance ( offset drifts ). Not battery operated , +/- 30 V rails.

[icefox]

ingvar,

Base on your pointer, I did further research, below seems to be some good info, just to share wit hhte community.

http://www.bonavolta.ch/hobby/en/audio/prepre.htm

http://www.bonavolta.ch/hobby/en/audio/hiraga.htm

Regards

[Vortex]

http://www.borbelyaudio.com/index32.htm

[fdegrove]

Hi,

Jean Hiraga designed a riaa stage based on ECC83 tubes with passive riaa correction between gain stages, not battery operated of course.

Actually that's not his design but a rework of the Japanese Sunsey "Minimum". It used only one ECC83 per channel for phono, I'm not sure if it was a passive RIAA but I can check if must be.

Later on the "Le Tube" was offered as a kit by their daughter company and retail outlet "La Maison de L'Audiophile".

The prepre used batteries as an option but could just as well be run from the mains supply.

No idea if the original FETs can still be bought but I'm sure people have come up with workarounds/equivalents.

Cheers,

[Snokker]

Hi,

I don't think that tubes are the best choice for battery oparation. I use the Hiraga Kaneda phono and line stage, in combination with the pre-pre. info at:
http://www.jls-info.com/julien/audio/index1.htm
For the power supply three 12V batteries in series with shunt coil work well!!

Regards

[triode_al]

This was a very dynamic design.
Like to use it 'straight' as I/V stage.

I remember I saw a PCB [on ebay] some time ago.
Does anyone have a hint?
thanks in advance.
albert

[Pano]

I built the tube passive RIAA years ago and loved it. Easy to build and sounds great. Adding a high pass filter is recommended.
Heard the prepre many times but never built it as I have never run MC carts.

[lcsaszar]

I built the tube phono "SRPP Anzai" some 25 years ago, and I am still using it (well, a bit upgraded). Simply the best.

[le´flu]

hi oshifis,
could you please give a link to the schematic of the srpp ansai
you are referring to? And what are the modifications you did?

Greetings ulf