Hello
I developed a Muses Volume and Input selection module
and build it into my Korg Nutube Preamp.
I called the whole module „PCU“ Preamp-Control-Unit.
In the photos you can see the structure of the preamp.
On the left the muses and digital board. On the right the input module with four inputs and next to it an input-expansion-board with two inputs. The PCU Modul is controlled via two encoders, alternatively with an Apple remote control, in the future also with an IOS app. I’ll make a description of the „PCU“ and post it here. I think I need a day to do that, so I could post the description here tomorrow, Sunday.
Juergen
I developed a Muses Volume and Input selection module
and build it into my Korg Nutube Preamp.
I called the whole module „PCU“ Preamp-Control-Unit.
In the photos you can see the structure of the preamp.
On the left the muses and digital board. On the right the input module with four inputs and next to it an input-expansion-board with two inputs. The PCU Modul is controlled via two encoders, alternatively with an Apple remote control, in the future also with an IOS app. I’ll make a description of the „PCU“ and post it here. I think I need a day to do that, so I could post the description here tomorrow, Sunday.
Juergen
Oh Jean, really good!
May I ask what the board-connectors on the input-board are? Those look awesomely cool!
May I ask what the board-connectors on the input-board are? Those look awesomely cool!
[emoji1303] hi Jürgen — thank you very much! Really nice, parts as well as the build!
(The „Jean“ above was meant to be a „yeah“ but my phone is anarchic)
Ya, I have seen stuff store bought that didn't come close to that. Nicely done, you can tell it was a labor of love.
muses/Preamp-Control-Unit
more information about the PCU Preamp-Control-Unit, Muses volume control here:
B1 with Korg Triode
more information about the PCU Preamp-Control-Unit, Muses volume control here:
B1 with Korg Triode
Was so impressed with the OPA1612 in my Whammy that I bought a pair of OPA1611 single channels for my Tucson boards. I am so glad I did. My M2x now has that same lush, yet detailed sound I find so appealing in this opamp. Worth the effort to put them on the adapters, although I did buy an extra fine tip for my Hakko solder station. It helps a lot.
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^ Good to know. So far the only opamp I've tried is the OPA604, which I found to be a bit dry for my taste. Good stereo separation, just dry. Of course I seem to enjoy a little bit of color that I get by using the 2N4416 JFet in my version of the Mtn View.
Allow me to mention that the original Tucson schematic, which is attached to post #1 of this thread, suggested two opamp part numbers. One of them was a thru-hole device, which builders can stuff and solder into the thru-holes on the Tucson PCB. The other was a surface-mount device, which builders can solder directly onto the SMD footprint of the Tucson PCB.
Alert readers also snapped up large quantities of extra Tucson PCBs so they could try out many different chip+package combinations.
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Alert readers also snapped up large quantities of extra Tucson PCBs so they could try out many different chip+package combinations.
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If you like modern, high-performance opamps, try Norwood. You’ll be very pleasantly surprised. 
My favorite overall was eventually the Austin diamond buffer. So much so that I adapted it to use as the front end for my F6. The vero board layout shown here is specific to my use, but could be adapted fairly easily to the M2x IPS board pattern, allowing higher voltage operation without stressing the output devices.
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If you mean the original JFet front end, yes. I preferred both the Mtn View (with my tweaks) and Austin to the Ishikawa.
Sigh, you mean I have to build another d-card to see? How about, you be a darling and send them over, so I can listen. 😀 If that's the case, I can build another amp for selling those 4 parts lol.
JT
Mark, my build is getting close, I finally got my input transformers today. Are there still extra Tucson boards available? I got DIP sockets, and adapters for the SOIC chips, but would not mind getting a separate set for the SMD, although I’m not sure I can do the assembly. I have the Ishikawa, and Mountain View built completely, at this point. I plan to fix the amp offset with the Mountain View cards. Working for the distortion analyzer setup to tune the Ishikawa boards, but that will follow getting to know the amp for a bit first.
I have the SMD OPA opamps, but would be happy to buy an extra set of the boards, and, pay for SMD installation. I realize I’m way late to the party though. Fortunately, I have 2 other input boards for now, and I might get brave enough to make the Austin boards. I know that I don’t have the skills for the Norwood boards.
Thanks again for this project, you and 6L6, for getting this in the DIYAudio store!
Pics in a week or so, when they are finished and functional.
Perhaps other diyAudio members have a few spare Tucson boards they would be willing to trade to you in a fair exchange. Quite a sizeable proportion built Ishikawa and no others, thus they have five sets of unpopulated daughter cards they are not using, Tucson among them. "WTB" as the first word of your title indicates Want To Buy. Perhaps here and in the Swap Meet section of the forum.
Whether you'll find anyone willing to solder your SMD chips for you, remains to be discovered.
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Whether you'll find anyone willing to solder your SMD chips for you, remains to be discovered.
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@Bones13: Check your PM.
Norwood is a "must hear". And Tuscon is also too much fun. Mark recommended LT1122 somewhere I think—and it's a winner for me. Also OPA1611 (after I worked out a little solder bridge I found on one of them!) is EPIC.