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B1 with Korg Triode
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Old 20th January 2020, 01:35 AM   #4041
Steve Luck is online now Steve Luck  New Zealand
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Originally Posted by Hikari1 View Post
I would love to have the soundstage and ambience of the korg with the dynamics and crisp
snare cracks on drums of my solid state preamps. Please tell me if this exists...

Try replacing the internal wiring with better quality. I've got plenty of kick with solid core gold plated internal.

IMG_0514.jpg

NB Power supply is external so no EFI worries.
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Old 20th January 2020, 01:47 AM   #4042
Soundhappy is offline Soundhappy  France
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100 uF is a lots..
Mine is 10 uF of Bipolar Muse UES1V100MEM1TD Nichicon | Mouser
+ 1uF MKT small size cap's mixture.
1000uF filament filter cap is bypassed with 8 uF MKP because one was found in the drawer.
Psu power resistors 10R and 270R are wire wound,. not everybody's cup of tea.
Oh yes me too I want try 10uF MKP
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Old 20th January 2020, 06:40 AM   #4043
ClaudeG is offline ClaudeG
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Hi Hikari,

Not sure you aren't listening to LM317 (and its different synergies) than anything else in your experiments, rather than comparing 'OEM' SMPS your with linear PS.

Sad you couldn't compare your extensive PS with what Papa's recommended first hand, as only that would IMHO permit to decide if really further improvements on the original PSU design are required or not, and if Papa's design was really limited in that aera. As said, Papa vs linear didn't work in my case, but then my starting point was Papa, not 2 different options of my own. And to be completely honest as you I thought it could be easily bettered when I looked at its simplicity and the use of SMPS, but at the end following (exactly) his receipe and also what he stated as possible upgrade recommandations was the winner for me.

Good luck with your experiments and keep us posed, Jung chokes etc. are again a different fish but then these could also bring a completely different sound. Really sad you can't compare them to the original design

Claude

Last edited by ClaudeG; 20th January 2020 at 06:43 AM.
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Old 20th January 2020, 01:11 PM   #4044
boakes99 is offline boakes99
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Default Build guide

Anybody have a link to the build guide ?
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Old 20th January 2020, 09:20 PM   #4045
rhing is offline rhing  United States
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I think something has gone wrong with my B1 Korg. I switched on my system to listen to some music and there was what sounded like RFI on the left channel. I was able to play music through the B1 Korg, but the noise kept coming through left channel. It sounds like the same noise I hear in tube amps when a tube is going bad and needs replacement.

We’ve had thunderstorms recently and I know that the power went out one night—possibly from lightning. I wonder if something might have damaged the NuTube as I left it powered on. I will make some measurements, but other than the noise in the left channel, the music sounds balanced from channel to channel.
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Old 20th January 2020, 09:35 PM   #4046
brian92fs is offline brian92fs  United States
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B1 with Korg Triode
Quote:
Originally Posted by boakes99 View Post
Anybody have a link to the build guide ?
It's in the Articles section of the FirstWatt site: DIY Nutube Preamp
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Old Yesterday, 05:43 PM   #4047
Nelson Pass is offline Nelson Pass  United States
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B1 with Korg Triode
Quote:
Originally Posted by rhing View Post
I was able to play music through the B1 Korg, but the noise kept coming through left channel. It sounds like the same noise I hear in tube amps when a tube is going bad and needs replacement.
One thing to remember is that the Plate of the tube is at a very high
impedance - the load resistor there to V+ is 330 Kohm, and it is very
susceptible to all sorts of noise pickup. Shielding and grounding
around this is important.
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Old Today, 02:09 AM   #4048
rhing is offline rhing  United States
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Thank you! I will follow-up on this next weekend when I have more time to work on it.
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Old Today, 03:22 AM   #4049
Soundhappy is offline Soundhappy  France
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Mr. Pass articles is plenty of useful circuit modules, for example, this 24V stabilized supply.
Thanks for schematic Components are easy to find.
Regular Greedy Boyz keeps few caps, IRF240 and zeners in a drawer with small toroid donut.
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Old Today, 07:25 AM   #4050
RegaPedro is offline RegaPedro
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Default Korg Nutube left channel no volume

The problem was a bad solder joint on the R1 resistor. Volume fine on both channels now. I also had a noise issue which for the most part was resolved by running the GND wire for the power supply for the power amp directly between the two. I still have a soft hiss at the speakers. I have tried changing the input signal wiring to shielded wire all the way from the input RCA jacks right to the input to the power amp module. No joy. I tried allowing the 24VDC for the Korg preamp to float by not grounding the minus, No change. Next I'm going to try putting the Korg PCB into a small enclosure to see if the noise goes away.
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