The CCS is a mosfet not jfet - so you will something else for that. LT spice is free and free to download. You will need a spice model for 2SK170 - diy audio!
LTSpice is a free download, but you will have to acquire Most tube models, and a majority of discrete SS components yourself.
B2 Spice is a John Broskie product, that was put together several years ago, I got in on the ground floor, before the price was marked up. It will run close to $600.00, but it is loaded 1000’s of components, including ALL the popular tubes, OPT’s are another story, I haven’t been able to get any OPT model to work properly. I’ve asked for technical help but didn’t get very far.
But so far as accuracy, it’s been at least 90%. Which saves a lot of breadboarding, I’ve designed phono stages that have been better than 95% accurate with B2 Spice.
Hi All,
It's been a little while since we talked. If I wanted to add passive RIAA to this design, where should I add it? I'm thinking after Q5? Am I correct that there is a RIAA filter already there...just not the complete network? The second network (bass?) is the feedback loop...which I want to remove. I plan to use something like the passive RIAA network from the PASS or Salas designs.
Thanks
It's been a little while since we talked. If I wanted to add passive RIAA to this design, where should I add it? I'm thinking after Q5? Am I correct that there is a RIAA filter already there...just not the complete network? The second network (bass?) is the feedback loop...which I want to remove. I plan to use something like the passive RIAA network from the PASS or Salas designs.
Thanks
The Salas folded Simplistic and the Pass Pearl (1 & 2) have it between the input stage and second stage? Not that I need to copy them, just a question. I could put the second filter after the tube stage. Trying to remove the feedback...but maybe I should just trust ARC.
I know they are not the know all/end all in design. The changes I made to the power supply were a dramatic improvement over the stock design.
Since I'm now talking "analog source" should I move this question to that section?
I know they are not the know all/end all in design. The changes I made to the power supply were a dramatic improvement over the stock design.
Since I'm now talking "analog source" should I move this question to that section?
Since this is a phono stage and a fet/tube hybrid, I would ask if a moderator could move, or link, all of this over to the correct section (analog source)?
I don't know how to move all of these posts?
I would like to continue the discussion over there, but I do thank all of you for your help and input.
I don't know how to move all of these posts?
I would like to continue the discussion over there, but I do thank all of you for your help and input.
I have it on good authority that Audio Research used the Toshiba 2SK117 in many of their front ends. Selected and matched, no doubt. This JFET looks like a "detuned" 2SK170. It is probably also hard to find now:
https://www.futurlec.com/Datasheet/Transistor/2SK117.pdf
https://www.futurlec.com/Datasheet/Transistor/2SK117.pdf