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UGS MUSES Scion Preamplifier.
UGS MUSES Scion Preamplifier.
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Old 20th July 2019, 09:09 AM   #31
Oneminde is offline Oneminde  Sweden
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Location: Darkside of the moon.
PRR; If the experts say something and I don't know anything better, all I can do is to agree .. LOL.

The current controlled comes from this:
  • Common Base Configuration has Voltage Gain but no Current Gain.
  • Common Emitter Configuration has both Current and Voltage Gain.
  • Common Collector Configuration has Current Gain but no Voltage Gain.
"A BJT is an example of a current controlled device since the current in the output circuit is controlled by the current and voltage in the input circuit." page 6
Source: https://nptel.ac.in/courses/113106065/Week%206/Lesson13.pdf

I think that's it

PS: I've had a week or so off from the project but should return shortly. Much of what I do now is research and preparation, so naturally it will be a bit quiet from time to time.

Oneminde


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Old 24th July 2019, 10:28 AM   #32
Oneminde is offline Oneminde  Sweden
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While I am studying and going over the old threads surrounding the UGS, I think I have found worthy replacements. Its not 100% but I feel confident in this parts.

JFET; This one is fairly simple - Toshiba 2SK209BL. Its an N-chn and will also replace the P-chn. Comes in SOT-23 package.

BJT: I didn't want to mix SOT-23 and TO-92 package since that would mean "special cooling solutions", instead, since the JFET is a smd unit, then I wanted the BJT to also be an smd unit. Since many recommend the ON Semiconductor BC550/560 this was my initial choice, but they come in TO-92 package only. Fortunately there exist smd equivalent. BC850/860. So unless anything change or I discover that the BC850/860 does not work, these are the BJTs I have selected.

Oneminde


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Old 24th July 2019, 10:52 AM   #33
CeeVee is offline CeeVee  Portugal
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UGS MUSES Scion Preamplifier.
2SK209BL are not easy to source at all and then you need the complementary which is harder.... 2SK209GR is still available at Mouser though and you need quantity to find matching pairs.

Did you look at the transistors used in UGS6 ?

Last edited by CeeVee; 24th July 2019 at 10:54 AM.
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Old 24th July 2019, 11:02 AM   #34
Oneminde is offline Oneminde  Sweden
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Quote:
Originally Posted by CeeVee View Post
2SK209BL are not easy to source at all and then you need the complementary which is harder.... 2SK209GR is still available at Mouser though and you need quantity to find matching pairs.

Did you look at the transistors used in UGS6 ?
2SK209GR will work (Idss: 2.6-6.5mA) since the bias is around 4mA. . The GR is also much easier to find. Remember, there will be no complimentary for this amplifier. N-chn conducts equally well in both directions.

UGS6 ... UGS 6. Can't say I've read about a 6 version. It might appear in on of the threads I am reading, but if not, plz attach a reference or post link to what you refer to.

Oneminde




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Old 24th July 2019, 11:06 AM   #35
CeeVee is offline CeeVee  Portugal
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UGS MUSES Scion Preamplifier.
http://www.hifishock.org/galleries/e...-pass-labs.jpg
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Old 24th July 2019, 11:09 AM   #36
CeeVee is offline CeeVee  Portugal
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UGS MUSES Scion Preamplifier.
http://www.hifishock.org/galleries/e...-pass-labs.jpg

but since you are going the 2SK209GR route disregard.
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Old 24th July 2019, 11:27 AM   #37
Oneminde is offline Oneminde  Sweden
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The UGS6 use Diodes Incorporated ZVN2110 (MOSFET) and Nexperia BCP53 (BJT).
I know some use dual-package JFET and the equivalent to the 2SK209 is the 2SK2145 which many use. The reason I am choosing monolithic JFET is matching







Last edited by Oneminde; 24th July 2019 at 11:52 AM.
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Old 24th July 2019, 02:58 PM   #38
Oneminde is offline Oneminde  Sweden
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I might have spoken early about the BJTs since Toshiba has some with very low NF.

Reminder: Wait to speak until you are done with all the UGS threads
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Old 26th July 2019, 12:09 PM   #39
Oneminde is offline Oneminde  Sweden
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Default Round 1 complete.

This is just to inform you that round 1 is complete, which included tracking down the essentials for the original UGS and UGS Muses edition. Now that I have all the material available, round 2 can commence which include redesigning the amplification section, choosing components etc. The UI will also be part of this. I will do sporadic updates and communicate with does who comment or ask questions.

Oneminde


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Old 1st August 2019, 04:04 PM   #40
Oneminde is offline Oneminde  Sweden
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CMRR - Common Mode Rejection Ratio.
From Ine123's UGS Muses build thread.

At 0 amplification - Sign.in = Sign.out: -87dB
At maximum amplification: -76dB

Compared to Pass Laboratores XP-30: -60dB @ 1kHz

I will ofc do all sorts of measurements once the unit is built and tuned.

Some THD measurements
UGS adventures



Last edited by Oneminde; 1st August 2019 at 04:31 PM.
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