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B1 with Korg Triode
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Old 10th February 2019, 08:25 PM   #1461
Rewind is offline Rewind  Sweden
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B1 with Korg Triode
Quote:
Originally Posted by emyeuoi View Post
The muses pot itself should be installed as a normal pot... no doubt here. Regarding the LED display, I can see from the picture that there are mounting holes on the pcb (at least the 2 that I can see). You can use those with small standoffs as support?

Rewind: as far I can see it’s just a pot, no opamp installed
I was mistaken. There is apparently a attenuation section and a gain section. The Passlabs XP-30 does not use the gain section according to Wayne Colburn.
From the review of the Passlabs XP-30 in Stereophile:

"The volume control, also carried on a small daughterboard, is based on a Muses NJU72320 integrated circuit. Although I am an unrecovered collector of datasheets, this chip was new to me; I asked Wayne Colburn about it. "It is part of the NJR Muses line from an in-house audiophile in Japan. They use copper lead frames and laser-trim the part. The designer of these parts came from Japan and gave samples to Nelson and myself to try and they ended up in the XP-30. I run the NJU72320 on ±15 volts so it has a large overload margin. I really like this part as it has no op-amps in it—I only used the front, attenuation section of the chip and not the gain setting section. We didn't use the Muse line op-amp—a discrete circuit is simpler and performs better with higher current and voltage." "
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Old 10th February 2019, 09:45 PM   #1462
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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The sound wasn't for me so mine is for sale - see swap meet
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Old 10th February 2019, 10:24 PM   #1463
chede is offline chede  Germany
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Quote:
Originally Posted by Bassivus View Post
Hi Bassivus,

I don't know how this volume control compares to Muses, because I have not tried a Muses yet ... but I am using a volume control (bought on eBay) that looks exactly like the one you linked to. Using it as an attenuator for my Aikido build. It sounds very transparent (better than an Alps Blue) and works flawlessly. And it is remote-controlled, and has four-way source switching, as well.

Best regards,
Claas

Last edited by chede; 10th February 2019 at 10:24 PM. Reason: removing excess CR/LF ...
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Old 10th February 2019, 11:17 PM   #1464
Bassivus is online now Bassivus  Serbia
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Quote:
Originally Posted by chede View Post
Hi Bassivus,

I don't know how this volume control compares to Muses, because I have not tried a Muses yet ... but I am using a volume control (bought on eBay) that looks exactly like the one you linked to. Using it as an attenuator for my Aikido build. It sounds very transparent (better than an Alps Blue) and works flawlessly. And it is remote-controlled, and has four-way source switching, as well.

Best regards,
Claas
Thanks! It's good to know the quality of those! I'll build the trial version with simple pot and if I like the sound I'll invest in one of those attenuator/switches.
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Old 11th February 2019, 05:24 AM   #1465
Mrshazbot is offline Mrshazbot  United States
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B1 with Korg Triode
I was able to get Diana working recently and this is one channel of the Nutube preamp at 11.4v.

Can one of you wizards help tell me what this means? I think I know but at the expense of sounding dumb, I'm just going to ask

Thanks,

Kevin


BTW - It sounds awesome and I have a couple things to do before I post some pics.
Attached Images
File Type: png B1 Nutube B 11.4v.PNG (222.8 KB, 567 views)
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Old 11th February 2019, 11:04 AM   #1466
claudio52 is offline claudio52  Italy
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B1 with Korg Triode
Hi, if the calibration is correct you have a THD of 0.53% (-45.5dB) @ 0.6Vp (0.42Vrms). The residue and the harmonics show that there ii not second harmonic that predominat. I'm sorry not to be of more help. Also I am interested in know more.

Last edited by jazbo8; 11th February 2019 at 11:18 AM. Reason: typo
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Old 11th February 2019, 02:25 PM   #1467
Puggie is offline Puggie  United Kingdom
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Brief update

RS have sent me a part order of tubes, some more are on the way. I should have PM'ed everyone for their address and about delivery cost:
if I have missed you please PM me.
if QWERTY! is bundling yours in with the PCB please let me know I will forward them to him.
When I said first come first served, there are plenty of tubes you just may have to wit for the second delivery which is likely to be the end of this week/start of next.
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Old 12th February 2019, 03:34 AM   #1468
delecoy is offline delecoy  United States
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Quote:
Originally Posted by Mrshazbot View Post
I was able to get Diana working recently and this is one channel of the Nutube preamp at 11.4v.

Can one of you wizards help tell me what this means? I think I know but at the expense of sounding dumb, I'm just going to ask

Thanks,

Kevin


BTW - It sounds awesome and I have a couple things to do before I post some pics.
See post 994. It explains which setting yields 2nd harmonic.
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Old 12th February 2019, 04:07 AM   #1469
fab is offline fab  Canada
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Quote:
Originally Posted by Bassivus View Post
Thanks! It's good to know the quality of those! I'll build the trial version with simple pot and if I like the sound I'll invest in one of those attenuator/switches.
Hi Bassivus
I have built a preamp for a friend using the same kit. It pay attention to a few things:
1) when changing from 64 to 65 dB there could be a high pitch sound while music is playing because there is no delay to prevent relay contact swithcing wrong sequence. Also, happens from 96 to 97 dB and so on....There is a thread on that issue. I could provide a reasonable fix by adding a new board creating delay between relays and preventing all of them at the same time. I have a few spare if you need one.
2) the circuit tends to be sensible to EMI. My friend had an issue with a defective remote control extender (radio wave) where the volume changed by itself.... once he turned off the defective device it has fixed the issue.
3) relay mechanical clicking can be annoying...so I have build a sound isolation cage using damping material inside a wood box.

But the sound is quite good.
Fab
Attached Images
File Type: jpg 6B385477-A68B-4C16-AF7C-D011E583D003.jpg (982.0 KB, 359 views)
File Type: jpg 0E817CED-D025-4A33-8046-77FFEC42849F.jpg (817.8 KB, 365 views)
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Last edited by fab; 12th February 2019 at 04:09 AM.
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Old 12th February 2019, 04:08 AM   #1470
Mrshazbot is offline Mrshazbot  United States
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Here are some pics of the final build. I went a little overboard on this one so it's a bit of overkill but I'm sure nobody minds that.

The PSU is a Sigma 11 24v regulated supply.

The volume control is a Khozmo remote controlled attenuator

I got the Nutube and carrier board from Pete Millet


The input selector is the Select-2 from Tubecad

I still need to glue the plexiglass inserts on the front panel but haven't gotten there yet but it will be smoked glass on the front.

A couple things I need to work out - My input selector pops. The other thing is that I have an Intel NUC -> DAC -> preamp and I can hear a slight buzz when the CPU is working. It wasn't there before but now I can hear it. I can't hear it while playing music but can when nothing is playing. Probably some sort of grounding thing.

Anyways, it sounds great. I have it hooked up to an F5 and it makes the bass much stronger (didn't expect that) and almost 3 dimensional but has a slight echo in my ears on the low end.

Thank you Mr. Pass !

Kevin
Attached Images
File Type: jpg 5D8A1709.jpg (357.0 KB, 363 views)
File Type: jpg 5D8A1720.jpg (145.3 KB, 366 views)
File Type: jpg 5D8A1718.jpg (272.2 KB, 219 views)
File Type: jpg 5D8A1715.jpg (163.9 KB, 197 views)
File Type: jpg 5D8A1711.jpg (200.8 KB, 181 views)
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