Hello,
I've red all the forum and I'very interested but I've seen too many schematics.
Anybody can help me?
Which is the las tfet riaa and shunt schematic?
May be with buffer stage, I need less then 10k of output impedence to mach with optivol volume control.
Anyone have a pcb available?
Sorry for too many questions but I arrived a bit to late.
Ciao
Guglielmo
I've red all the forum and I'very interested but I've seen too many schematics.
Anybody can help me?
Which is the las tfet riaa and shunt schematic?
May be with buffer stage, I need less then 10k of output impedence to mach with optivol volume control.
Anyone have a pcb available?
Sorry for too many questions but I arrived a bit to late.
Ciao
Guglielmo
Hi Salas,
I am collecting parts to built your RIAA, based on your original schematic with 56 db gain. My cartridge is a Shelter 901 with about 0.5 mV output.
You think this is the best choice? It will drive a 10K pot followed by a JC buffer. Also the recomended loading is 100R. I tried different values before but did not like them. Should I try something higher with your RIAA?
Regards
George
I am collecting parts to built your RIAA, based on your original schematic with 56 db gain. My cartridge is a Shelter 901 with about 0.5 mV output.
You think this is the best choice? It will drive a 10K pot followed by a JC buffer. Also the recomended loading is 100R. I tried different values before but did not like them. Should I try something higher with your RIAA?
Regards
George
Hello Salas,
I've an old Ortofon OM10 that have 0,1mV output and may be in the future a Denon DL103.
Thanks a lot
Guglilemo
I've an old Ortofon OM10 that have 0,1mV output and may be in the future a Denon DL103.
Thanks a lot
Guglilemo
Salas thanks!
May I assume that if I use a 50K pot I can use your original schematic or it is still better what you have suggested?
I have a 50k pot I can try with my buffer. Maybe it will work fine. Also thinking to built a B1 to go with it.
Regards
George
May I assume that if I use a 50K pot I can use your original schematic or it is still better what you have suggested?
I have a 50k pot I can try with my buffer. Maybe it will work fine. Also thinking to built a B1 to go with it.
Regards
George
guglielmope said:
You will need 68dB for the Ortofon or 62dB for the DL103 for proper dynamics. I suggest you to make this I attach, and use a 10X step up transformer. Much preferably without separate box or extra interconnects. Incorporated inside the phono. There are 2 PCBs compatible with it presented here. One by Ikoflexer and one by Kent. Browse back.
guglielmope said:
It goes without saying, selected and matched. Please read the thread carefully.
Regards
Attachments
vgeorge said:
The buffer type in the Riaa proved almost transparent. I would use it so to be flexible. If settling over 50k, only then, when really familiar, bypass it and compare. B1 I am the one who presented it capacitor-less in the Pass thread. I am familiar. If you look back in this thread, I have shown how to incorporate one directly on the phono tail, without coupling caps. Don't make another box with another interconnect set and PSU, if it is intended only for the phono. Only losses and much more extra money you will achieve.
guglielmope said:
That is done by Ikoflexer only. I don't have any direct experience. He must tell you the practical details. He mentioned using a heavier drive Darlington bipolar for instance...
Thanks once more.
I will stick to your last schematic then. It is better to have a little bit more flexibility to change through differenet preamps.
I have most of the russian capacitors and I missing some resistors and a zener for the shunt. Half of the power supply with a CLC is ready. Will post some pictures when ready.
George
I will stick to your last schematic then. It is better to have a little bit more flexibility to change through differenet preamps.
I have most of the russian capacitors and I missing some resistors and a zener for the shunt. Half of the power supply with a CLC is ready. Will post some pictures when ready.
George
guglielmope said:
Maybe Ikoflexer's buffered Mosfet driver tweak can be subjectively different, I am not in a position to directly know. The standard 28V LED shunt that Rcruz made, he reported it dead silent. That is all I can personally know.
They should be, because some that I measured don't hit their nominal 15X, closer to 12-13X. So I don't think they will overdrive.guglielmope said:
Perfect Salas,
I'll keep you informed of my progress.
Now I'm also building a Simplistic Mosfet HV Shunt Regs for my dac tube buffer.
HAve nice day.
Ciao e grazie
Guglielmo
I'll keep you informed of my progress.
Now I'm also building a Simplistic Mosfet HV Shunt Regs for my dac tube buffer.
HAve nice day.
Ciao e grazie
Guglielmo
Gugliemo, are you sure that your cart is 0,1mV output? Because I saw Ortofon OM10 as a 4mV budget MM cartridge. If that is the case, you should need about 40dB gain and use the step up only when you will get the DL103.
I made a mistake I've an old Ortofon MC10.
and I've found 0,1mv on the user manual.
I've found all I was looking for on the forum but I where I can find info about matching fets or buy matched ones?
Thanks a lot for your help and interest
Grazie
Guglielmo
and I've found 0,1mv on the user manual.
I've found all I was looking for on the forum but I where I can find info about matching fets or buy matched ones?
Thanks a lot for your help and interest
Grazie
Guglielmo