Greetings all,
This is my first thread here but I have been a long time reader and learned a lot. I have been an owner for the Le preamplificateur Kanda I have assembled it from the kit back then and I have upgraded the filter capacitors few years back and I am really happy with the sound. However, now I am looking to do some modification and I would be really happy to be advised and guided by your experience. this is the Document for the preamp I have installed and aligned as per the instructions with great help from friends. the sound is great especially in the low frequency it makes my Technics Sb-500 ring the room. I believe the unregulated power supply section is fine unless you have a new idea. please see the picture below. please see the picture.
looking forward to hear your ideas.
Thanks
Ahmed
This is my first thread here but I have been a long time reader and learned a lot. I have been an owner for the Le preamplificateur Kanda I have assembled it from the kit back then and I have upgraded the filter capacitors few years back and I am really happy with the sound. However, now I am looking to do some modification and I would be really happy to be advised and guided by your experience. this is the Document for the preamp I have installed and aligned as per the instructions with great help from friends. the sound is great especially in the low frequency it makes my Technics Sb-500 ring the room. I believe the unregulated power supply section is fine unless you have a new idea. please see the picture below. please see the picture.
looking forward to hear your ideas.
Thanks
Ahmed
Wonderful!
Nice idea with reversing the common mode choke on the return side. Wonder if that helps.
Do you have a schematic?
Nice idea with reversing the common mode choke on the return side. Wonder if that helps.
Do you have a schematic?
Thanks for your reply.
Yes, I do have the schematics
I am thinking about it right now I think this will reduce the inductance and increase the current handling which is not required in this application. correct me if I am wrong. see the power supply schematics. Lately, I have adde an extra 2x 100,000uf BC capacitors in Parallel which increase the Low freq. sound significantly.
I do have the original Documents somewhere but these are similar.
Yes, I do have the schematics
I am thinking about it right now I think this will reduce the inductance and increase the current handling which is not required in this application. correct me if I am wrong. see the power supply schematics. Lately, I have adde an extra 2x 100,000uf BC capacitors in Parallel which increase the Low freq. sound significantly.
I do have the original Documents somewhere but these are similar.
Attachments
I would like to explain the sound difference between the line stage and the phono stage. In this preamplifier listening to vinyl is unique in such a way that the 3D stage will be extended in the room and where its more narrow in the line stage so that listening to same track. I would like to cure this phenomena if possible.
It is very tricky to compare like you seem to do.
When playing vinyl through the Kaneda phono preamp, the corrected phono signal will also pass the Kaneda line stage.
When playing for example digital sources, they only pass the Kaneda line stage.
So you seem to compare sources (vinyl vs other), not the line stage with the phono preamplifier.
When playing vinyl through the Kaneda phono preamp, the corrected phono signal will also pass the Kaneda line stage.
When playing for example digital sources, they only pass the Kaneda line stage.
So you seem to compare sources (vinyl vs other), not the line stage with the phono preamplifier.
Besides, phono and line stages are identical.
They can best be described as discrete opamps with active feedback networks to realize RIAA equalization (phono stage) and optional LF boost (line stage).
They can best be described as discrete opamps with active feedback networks to realize RIAA equalization (phono stage) and optional LF boost (line stage).
Sorry for my late response,
I agree with the discrete description. you are right I shall write comparing vinyl vs others in my previews post. coming to the main subject there must be a unique in the active feedback network that really makes this phono stage sound like so good specially the low frequencies. in the schematics I can see there are nothing I can change without affecting the trimpots which took a lot of time to adjust at that time so we had to adjust two of them at the same time and waiting for the temperature to become stable and we always took care of the rail voltage not exceeding 35v which is the maximum for these JFET. I am hesitant to do change now.
I agree with the discrete description. you are right I shall write comparing vinyl vs others in my previews post. coming to the main subject there must be a unique in the active feedback network that really makes this phono stage sound like so good specially the low frequencies. in the schematics I can see there are nothing I can change without affecting the trimpots which took a lot of time to adjust at that time so we had to adjust two of them at the same time and waiting for the temperature to become stable and we always took care of the rail voltage not exceeding 35v which is the maximum for these JFET. I am hesitant to do change now.
I am interested to build the regulated power supply version for the phono stage but I cant find the full documents and sure the parts are not available nowadays.
