Very cool! Usually it is not an issue with the parts. I suppose that's a good thing 🙂
This is a really good resource for playing with the bias:
https://www.diyaudio.com/community/threads/b1-with-korg-triode.313612/post-7183945
The lower the bias the less stress on the tube. However, it should last a very long time regardless. Also swapping the Leads on both your speaker terminals changes the phase of the distortion. Another fun experiment.
This is a really good resource for playing with the bias:
https://www.diyaudio.com/community/threads/b1-with-korg-triode.313612/post-7183945
The lower the bias the less stress on the tube. However, it should last a very long time regardless. Also swapping the Leads on both your speaker terminals changes the phase of the distortion. Another fun experiment.
I think that in the future I will put the tube in a socket. They are no fun to remove as the leads are far from sturdy. Also, mounting could be improved by isolation if a socket were not attached to the board.
Some of you have placed 10 turn pots on the rear panel of the pre. That seems to be a very good idea for those of us who always want to know 'the difference'.
Some of you have placed 10 turn pots on the rear panel of the pre. That seems to be a very good idea for those of us who always want to know 'the difference'.
Would you have to put a test point on the back as well? I never saw the posts regarding the 10 turn.
It would make good sense to do so as otherwise you would have to get into the chassis to get to the test points.
Finished mine just before NY, not my best work, but i expected worse 😀
Bias is set to ~9.5v
Bit dodgy filter board setup, its held by a hot glue. Signal Caps were too big to fit on original PCB, so they had to go flying above in "3D" arrangement 🙂
Mod's replacement as recommended by @Brijac , main resistors, main caps, and signal caps.
Only issue i have is bit with ground when touching pot/chasis, so il have to ground pot and filter pcb, at some later point 🙂
Bias is set to ~9.5v
Bit dodgy filter board setup, its held by a hot glue. Signal Caps were too big to fit on original PCB, so they had to go flying above in "3D" arrangement 🙂
Mod's replacement as recommended by @Brijac , main resistors, main caps, and signal caps.
Only issue i have is bit with ground when touching pot/chasis, so il have to ground pot and filter pcb, at some later point 🙂
Attachments
Similar "3D" arrangement here with my build which I finished some months ago. It sounds good! Have fun!! 😀
Gaetano.
Attachments
I wanted to update the thread:
I ordered the new set of JFET/ resistors/ board and replaced the JFET/ resistors on the suspect channel and how everything is running nicely. Voltage adjusts how it should, and the preamp is back to sounding like its fantastic self.
Thank you EVERYONE for your help!
I ordered the new set of JFET/ resistors/ board and replaced the JFET/ resistors on the suspect channel and how everything is running nicely. Voltage adjusts how it should, and the preamp is back to sounding like its fantastic self.
Thank you EVERYONE for your help!
Hi,
I just didn't pay attention for a very short time... really... I sometimes play with various ideas, how to build this and that...
So also on Tuesday. Only... 10 minutes ago the delivery person rang, the B1 Korg Nutube Kit arrived 😀
I just didn't pay attention for a very short time... really... I sometimes play with various ideas, how to build this and that...
So also on Tuesday. Only... 10 minutes ago the delivery person rang, the B1 Korg Nutube Kit arrived 😀
Hi, Can I use B1 Korg preamp for Whammy headphone amplifier ? I want to use it preamp for headphone system
I will use it that way, because the US plug from the kit doesn't work in Austria. It's absolutely safe.
You only have to watch out for possible ground loops if the Meanwell shares its ground with AC earth and so does the source. You can get Meanwells with isolated ground as well as other brands.
Yeah, that was a quick one, it took 6,5 hours 😀
Green glow, no smoke, so measurements can start 👍
Green glow, no smoke, so measurements can start 👍
Many thanks, also for the advice 🙂Nice wiring, but you might see a little crosstalk on the input.
I can't hear nothing until now, apart from great music
But I will separate the input wiring, just to be sure there is nothing. However, I use/need one input only.
Hello Plott,
why shouldn't the B1-NUTUBE fit the M2X?
Only problem could become time - i needed a lot of time to listen through my most preferred input-buffers of the M2X and
the adjustability of the B1_NUTUBE. And try to swap polarity of your loudspeakercables depending on the adjustment of the B1-NUTUBE.
I think you have a long lasting listening programme for the near future... Have fun! 😉
Cheers
Dirk 🙂
why shouldn't the B1-NUTUBE fit the M2X?
Only problem could become time - i needed a lot of time to listen through my most preferred input-buffers of the M2X and
the adjustability of the B1_NUTUBE. And try to swap polarity of your loudspeakercables depending on the adjustment of the B1-NUTUBE.
I think you have a long lasting listening programme for the near future... Have fun! 😉
Cheers
Dirk 🙂