It was sort of rethorical, the P2 at its midpoint drives the 1.0mV Grado just fine... so I'd guess the highest gain will drive the 0.33mV just fine...
BTW, You Know Who... take a bow... take claim to the build if you want... not my build, I just, ahem... enjoy the hell of it.. Thanks. My only concern was that the knobs and switches are on the back panel.... sort of a very unassuming box until you look at the rear.
BTW, the Grado's moving iron design is impervious to load capacitance. That factory told me so... I kept it at 100 pF because that's where I've kept Grados for like 20 years ( previous CJ PV9 is set that way by default ). Maybe I ought to try 'none'...
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My old xp-15 and current Xono clone work with at 0.25mV ZYX cart. So the P3 at high gain should be a-ok, too. Same gain spec at the Xono and XP15
^ great to hear.
BTW, I posted that picture of the back panel because, let's face it, that work for the P3 is done. Just reuse that design. It works very well.
For the cheapskates go with the DIP design... but for those of us who really like the convenience, and better BOM, use THAT design. It looks, and works, very nice.
Another thing... Power Supply. The Xono has an upgraded power supply? How about using something like that, down rated to the lower voltagem minus support for the controller/remote? Short of a laboratory/metrology power supply, it seems like the Xono has the best one extant for the P3... Unless you guys came up with a better one ( might as well )...
So, my comments, take them or leave them, DIYStore wise. Offer two kits.
(1) DIP configuration for the cheapskates. No sockets for opamps. Made to fit into a 1U chassis.
(2) Back panel adjustments with upgraded BOM materials. With preinstalled opamp sockets. Assume a 2U chassis. (*)
Power supplies
(1) No power supply, let the crowd buy/build theirs.
(2) Super Duper external power supply. Could also be the upgrade path for (1) above.
We should make Wayne proud of his design. Heck we should all be proud of his design as we lower the stylus on to the lead in groove... and lucky that it was shared and that so many people are really working on it. Thanks to you all!
Sure, I'm not building it... I'm just offering my 2 cents from the Systems, Sales and Marketing side of the R&D. If I were building I'd be more concerned at the Supply Chain for fire extinguishers and band aids.
(*) The Burson discrete opamps fit into their 1/75" high Swing... but just barely.
https://diyaudiostore.com/products/burson-audio-v6?variant=31588598710345
BTW- how many opamps will I need? One dual per channel?
BTW, I posted that picture of the back panel because, let's face it, that work for the P3 is done. Just reuse that design. It works very well.
For the cheapskates go with the DIP design... but for those of us who really like the convenience, and better BOM, use THAT design. It looks, and works, very nice.
Another thing... Power Supply. The Xono has an upgraded power supply? How about using something like that, down rated to the lower voltagem minus support for the controller/remote? Short of a laboratory/metrology power supply, it seems like the Xono has the best one extant for the P3... Unless you guys came up with a better one ( might as well )...
So, my comments, take them or leave them, DIYStore wise. Offer two kits.
(1) DIP configuration for the cheapskates. No sockets for opamps. Made to fit into a 1U chassis.
(2) Back panel adjustments with upgraded BOM materials. With preinstalled opamp sockets. Assume a 2U chassis. (*)
Power supplies
(1) No power supply, let the crowd buy/build theirs.
(2) Super Duper external power supply. Could also be the upgrade path for (1) above.
We should make Wayne proud of his design. Heck we should all be proud of his design as we lower the stylus on to the lead in groove... and lucky that it was shared and that so many people are really working on it. Thanks to you all!
Sure, I'm not building it... I'm just offering my 2 cents from the Systems, Sales and Marketing side of the R&D. If I were building I'd be more concerned at the Supply Chain for fire extinguishers and band aids.
(*) The Burson discrete opamps fit into their 1/75" high Swing... but just barely.
https://diyaudiostore.com/products/burson-audio-v6?variant=31588598710345
BTW- how many opamps will I need? One dual per channel?
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Some relevant art. (I understand production PSU PCBs will be blue.)
Looks incredible!!
Not quite the final PSU board, but very close. Newest revision has room for an alternate transformer. So cool.
Not quite the final PSU board, but very close. Newest revision has room for an alternate transformer. So cool.
What is the fascination with with Quasimoto.
A solution in search of a problem?
Thanks DT
Lots of happy users. Clear, measurable results. Try yourself, you might like it.
@rhthatcher
Perhaps of interest too, the Triad Magnetics Split Pack PC mounts
https://catalog.triadmagnetics.com/...mount-split-pack-class-2-3-power-transformers
Perhaps of interest too, the Triad Magnetics Split Pack PC mounts
https://catalog.triadmagnetics.com/...mount-split-pack-class-2-3-power-transformers
Regarding the chassis….
Jim 6L6 and I are working with Gianluca at Modushop on a couple of design options that will be prototyped. We’re starting with 1U height galaxy with a 2 box solution (RIAA and PSU) and a one box solution. All with custom faceplates are back plates. We should have first pass drawings for review shortly. Stay tuned.
I think the future plan will be that you can reach out to modushop and order a Pearl 3 chassis kit. This is similar to the concept for ordering the IronPre chassis.
While the Modushop chassis is being made I plan to temporarily test in a spare linestage chassis that I have. It’s a one box unit with a wall in it.
Jim 6L6 and I are working with Gianluca at Modushop on a couple of design options that will be prototyped. We’re starting with 1U height galaxy with a 2 box solution (RIAA and PSU) and a one box solution. All with custom faceplates are back plates. We should have first pass drawings for review shortly. Stay tuned.
I think the future plan will be that you can reach out to modushop and order a Pearl 3 chassis kit. This is similar to the concept for ordering the IronPre chassis.
While the Modushop chassis is being made I plan to temporarily test in a spare linestage chassis that I have. It’s a one box unit with a wall in it.
The Quasimodo is a very useful tool. It makes an easy job of getting the ringing damped just right. If you need to get CE, FCC or CSA etc certified it helps get you there faster by elimination of the rf related harmonics. A side benefit is usually improved audio.
It seems with a cartridge as Ortofon 2M black which outputs 5 mV the 49 dB gain setting will output about 1.5 V so that should be the correct setting for such a cartridge. I like that.....lower gain will give me less noise 🙂
Will there be two PSU-boards in a kit?
One for each channel?
Will there be two PSU-boards in a kit?
One for each channel?