Im going to build a MC pre https://diyaudioprojects.com/Solid/JFET-MC-Pre-Preamp-Kit/
but what are the substitute for 2sk170 BL?
What jfet can I use?
I can even use smd.
suggestions
but what are the substitute for 2sk170 BL?
What jfet can I use?
I can even use smd.
suggestions
If you are open for different circuit, Richard Lee's MC pre is quieter,
https://hifisonix.com/technical/richard-lees-ultra-low-noise-mc-head-amp/
https://hifisonix.com/technical/richard-lees-ultra-low-noise-mc-head-amp/
It's a very bad idea to have quite large large resistors at gate and source; you are making noise generators...
Now look what you did,you made me change my mind....😉I am going to build a verision that runs on a 9 volt battery.
That only needs 1.5V battery for one channel, with D size, denon-103/hana-sl can be always on for whole year, art9 for half year, zyx every 3 months.
Yes its the first one Im gonna build.So you mean that this one will work with a 1,5v battery?
Are you looking to build an MC head amp, or a complete MC phono stage with RIAA?
I built this MC head amp for feeding into various RIAA preamps I have; designed it with Sean Collins, based on input and prior design for another preamp by Wyn Palmer, designer of many op amps and other items at ADI for 40 years.
Very low distortion, lots of adjustability for R and C loading with dip switches on the bottom. I built mine with an outboard power supply using a flat pack transformer; the regulators are SMDs on the head amp board.
Fits into a pretty small chassis, but you would have some metalwork to do to create openings for the DIP switches. I used my milling machine.
PM me if you'd like more info.
Cheers,
Greg
I built this MC head amp for feeding into various RIAA preamps I have; designed it with Sean Collins, based on input and prior design for another preamp by Wyn Palmer, designer of many op amps and other items at ADI for 40 years.
Very low distortion, lots of adjustability for R and C loading with dip switches on the bottom. I built mine with an outboard power supply using a flat pack transformer; the regulators are SMDs on the head amp board.
Fits into a pretty small chassis, but you would have some metalwork to do to create openings for the DIP switches. I used my milling machine.
PM me if you'd like more info.
Cheers,
Greg
The Marshall Leach design is time tested and still holds its own. It has been copied/modified many times over the years (Marcoff, Lee, etc.). Built my first one in '88 (crude hand-made boards). Built a 2nd one 4 years ago w/real boards. Simple, effective and very quiet.
Design & build thread: The Leach moving coil pre-preamp
See last page for end result photos.
It can be built in original Common-Base or Current-Mirror configuration, using either discrete transistors or the "THAT-340" monolithic matched NPN/PNP pairs chip (used in my build).
... or ...
A dirt simple 1 chip (AD797 opamp) circuit is equally as good, perhaps a bit better, but requires a dual-polarity power supply.
While this is a bespoke design, it shows an example of low parts count and small size capability: Apt Holman plug-in MC expansion board
Design & build thread: The Leach moving coil pre-preamp
See last page for end result photos.
It can be built in original Common-Base or Current-Mirror configuration, using either discrete transistors or the "THAT-340" monolithic matched NPN/PNP pairs chip (used in my build).
... or ...
A dirt simple 1 chip (AD797 opamp) circuit is equally as good, perhaps a bit better, but requires a dual-polarity power supply.
While this is a bespoke design, it shows an example of low parts count and small size capability: Apt Holman plug-in MC expansion board