If all parts are matched, yes. In the essentials kits, the followers are matched
for Idss, and the CCS are matched and given a Source resistor to set their
bias to the Idss of the followers. The followers and CCS fets are not matched
to each other for the J113's as the population of desired Idss is relatively small.
for Idss, and the CCS are matched and given a Source resistor to set their
bias to the Idss of the followers. The followers and CCS fets are not matched
to each other for the J113's as the population of desired Idss is relatively small.
OK I think I get it.
For the K170 I matched them (q1 and q2) in pair among the many I've here and then R1=0 Ohm.
For the K170 I matched them (q1 and q2) in pair among the many I've here and then R1=0 Ohm.
Correct, I'm using the acronym for baffle step correction which normally gets placed on the positive side of speaker. That makes me think that if I reverse speaker wires the BSC is not affecting driver supply (positive) but rather the return to amplifier (negative). My understanding of the electrical principles might be flawed.
The Korg B1 is very simple, even for novices, and well worth anyone's time. The only tricky part is the phase business, which I'm still fuzzy on. I appreciate the help and thanks for the build.
I agree with your last statement there Patrick. The B1 Kong is certainly worth the time. I’ve been listening to mine for about two albums now. The sound is silky smooth yet detailed. Very nice.
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First post ever here on diyaudio. (Sorry for poor English)
Very happy with my Korg Nutube, it sounds fantastic. Have been playing with it for a couple of days now. I am using it with my two ACAs in parallell mono drivning Hesselvall NO:2 (4 Ohm, 99dB) speakers.
I am an absolute Noob When it comes to reading and understanding wiring diagram, but have manged to build the ACA(s) and the nutube thanks to 6L6,s build guides.
Might try building better poweramp(s) later, but afraid its to difficult for me.
But if i do, what amp should i go for?
Very happy with my Korg Nutube, it sounds fantastic. Have been playing with it for a couple of days now. I am using it with my two ACAs in parallell mono drivning Hesselvall NO:2 (4 Ohm, 99dB) speakers.
I am an absolute Noob When it comes to reading and understanding wiring diagram, but have manged to build the ACA(s) and the nutube thanks to 6L6,s build guides.
Might try building better poweramp(s) later, but afraid its to difficult for me.
But if i do, what amp should i go for?
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F6 is good start, I think. You will get good advice here. If you don’t care for real loud music you can go for F4 (no gain, but very transparent). B1 Korg is enough for your speakers.
FIRST WATT PRODUCTS
FIRST WATT PRODUCTS
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The result will be the same. Neither the speaker nor the network
have knowledge of the larger picture.....
Any news on when the kits are supposed to ship? The store blog said the parts where in stock a month ago.
The Parts Completion kits will ship during Q3 of 2020.
The item you refer to in the blog is the PCB+Jfets kit, which is the PCB, the selected/matched Jfets and their accompanying resistors.
The item you refer to in the blog is the PCB+Jfets kit, which is the PCB, the selected/matched Jfets and their accompanying resistors.
I have already ordered the Korg Nutube B1 kit. I was considering building a BA-3 and the complementary output stage, but I'm worried that the gain 16db from the preamp + the 30db from the BA-3 frontend = 46 db of gain will be far too much. I use efficient loudspeakers in a small room, but I don't want to build an F4 because I would love the ability to add the BA-3 front end later on, and the more expensive BOM of the F4. Would the Korg B1 be able to directly drive the complementary output? I figured I would ask here first since the Korg B1 is coming no matter what, but let me know if this question is more applicable to the BA-3 thread instead.
BA-3 front end is really about 15db when built with stock values.
Yes, there's no reason why the Korg couldn't drive the BA-3 comp directly. Give it a try!
Yes, there's no reason why the Korg couldn't drive the BA-3 comp directly. Give it a try!
Do be aware that the Korg is good to about 2 volts out - you might be able to
get 1 watt into 8 ohms, but I wouldn't expect more.
That said, I listen to less than 1 watt most of the time.
get 1 watt into 8 ohms, but I wouldn't expect more.
That said, I listen to less than 1 watt most of the time.
Got my Korg B1 (Xmas version not full kit) up and running today. Not yet fully dropped into chassis, so PCB and volume pot just kind of haning in space or propped on cardboard.
Some microphonics at times, but when those are not in play the sound is glorious. Sounded great immediatley upon powering it up. Now time to drill the actual chassis vs the current make-shift temp chassis. Many thanks, Nelson!
Some microphonics at times, but when those are not in play the sound is glorious. Sounded great immediatley upon powering it up. Now time to drill the actual chassis vs the current make-shift temp chassis. Many thanks, Nelson!
Its amazing after 2 months. Coherent yet saturated. 3d and clean.
Nothing quite like it..
The burn in is quite long like the aca.i think it's longer than most build, it have a shrill sound for a month or so . Will adding a cap 100 200 pf to the input to ground helps?
This is another must do preamp... I enjoyed it very much.
Nothing quite like it..
The burn in is quite long like the aca.i think it's longer than most build, it have a shrill sound for a month or so . Will adding a cap 100 200 pf to the input to ground helps?
This is another must do preamp... I enjoyed it very much.
Finished! B1 Korg
First post here on diyaudio, finallly confident enough to share my results.
Anyhow: here is my finished b1 Korg. I’m listening to it for over a week and although I’m not done experimenting with phase and settings it already sounds fantastic. I’m listening to it on my acoustat spectra 2200’s. I use a hypex Ucd180hg amplifier, wadia12 dac and a squeezebox touch. The soundstage and imaging is fantastic. The bass is good, highs a bit much. Detail is amazing. Difficult and complex music can be fatiguing, music with less instruments (e.g. jazz or some classical music) sounds great.
It is not my first build but it is the most satisfying one. My first build was a stereo aleph X (sounds fantastic but uses too much power to listen to it comfortably, in my opinion) and I built the chassis for the hypex modules.
For the chassis I used a solid piece of aluminum I had lying around (similar to the one I used for the hypex). The front and back I ordered at scheaffer frontplatten (Germany). The input selector and volume control (attenuators relay) are from AliExpress (maybe room for improvement but the build quality is good and they are silent when no music is playing). The power supply is a traco txm-025-124. The volume control, input selector and i/o circuit is powered by a separate ps. Both power supply’s are housed in a chassis separate from the b1-chassis.
I had loads of fun! Thank you all for your wisdom and thanks mr Pass for facilitating a fantastic hobby.
First post here on diyaudio, finallly confident enough to share my results.
Anyhow: here is my finished b1 Korg. I’m listening to it for over a week and although I’m not done experimenting with phase and settings it already sounds fantastic. I’m listening to it on my acoustat spectra 2200’s. I use a hypex Ucd180hg amplifier, wadia12 dac and a squeezebox touch. The soundstage and imaging is fantastic. The bass is good, highs a bit much. Detail is amazing. Difficult and complex music can be fatiguing, music with less instruments (e.g. jazz or some classical music) sounds great.
It is not my first build but it is the most satisfying one. My first build was a stereo aleph X (sounds fantastic but uses too much power to listen to it comfortably, in my opinion) and I built the chassis for the hypex modules.
For the chassis I used a solid piece of aluminum I had lying around (similar to the one I used for the hypex). The front and back I ordered at scheaffer frontplatten (Germany). The input selector and volume control (attenuators relay) are from AliExpress (maybe room for improvement but the build quality is good and they are silent when no music is playing). The power supply is a traco txm-025-124. The volume control, input selector and i/o circuit is powered by a separate ps. Both power supply’s are housed in a chassis separate from the b1-chassis.
I had loads of fun! Thank you all for your wisdom and thanks mr Pass for facilitating a fantastic hobby.
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Congratulations excellent DIY build work!
B1 Korg is very flexible adjustable preamp and audio friendly for experiments.
Get more Fun!😀
Anyone know of a good source of sorbothane or something similar to deal with the microphonics? I used to have quite a bit of it but had no idea how expensive it is! Otherwise, I'd not have thrown it away....