There are so many design trade offs, it is far more than type of amplification device. Bias current which sets operation point, gain, bias current vs gain ratio will make significantly more difference then active device used. By the way MOSFET (Metal Oxide Semiconductor Field Effect Transistor), JFET (Junction Field Effect Transistor), BJT (Bipolar Junction Transistor), just so you know.
There is no typical sound for Bjt, Mosfet or Jfet, it depends on too many factors. Apples and oranges. The lpb-1 is not a clean boost, it's a mild overdrive no matter where the volume is set to because the gain is fixed. Plus, the input impedance is terrible (tone sucking) ,the bias is not so good so the headroom is not optimal and the gain is too high for 9v. There's way better bjt booster than the lpb-1 with better impedance, bias method, and gain. For the mosfet, the SHO is actually a well designed circuit in my opinion. The input impedance is high when the gain is low and low when the gain is high which is good to tame the upper frequencies when it distorts. The gain is adjustable so you always have a good noise to level ratio. The SHO is coloring the sound a little bit though, being a little on the bright side. A more transparent mosfet boost would be the AMZ mosfet boost. As for the Jfet, it's not specified which circuit it is but the characteristics of all JFet varies greatly. J201 have very little headroom in general and mpf102 have more headroom which leads to differents sounds and uses.
LPB-1 is okay if you put a boss tuner in front of it for the buffer. but yeah i think if i was building my own version i would put a JFET buffer at the input stage of it
@@ryanmelvey8764 The LPB-1 will clip a strong signal (like a humbucker or a hot single coil like a p-90) even if you put a buffer before. It will solve the input impendance though. I don't say that the LPB-1 sound bad, it doesn't color the sound very much unless it clips. If your guitar has regular single coil like a strat for instance, it probably won't clip or won't clip enough to be obvious. The configuration of the J-Fet buffer matters a lot for the headroom. You can use a single high value resistor to ground at the input in a J-fet buffer and still have a decent headroom if the J-Fet that you use has a high Vp. A good value would be around -2.5v. Otherwise, you can use two resistors of equal value, one to the ground and one to the V+. In that case, you'll bypass the J-fet Vp. but the input impedance will be around half the value of the resistors you use and it shouldn't be too high because high value resistor are noisy.
Preferring the Mos-FET or the J-FET is like asking if you prefer 1.2k bumped in mix or 1k. The Mos-FET tightens the bottom a little and the J-FET is a bit more open and jangley but both produce a sound more ceramic speaker specific. The 2SC1815 Bipolar gives a much wider less compressed spectrum, less punch but more open and chimey, more old-school Hi-Fi sound, closer resembling an alnico speaker effect. I like them all but the 2SC is a stand out. To my ear, that's getting into Mike Campbell (guitarist for Tom Petty) territory. It might (ok, almost certainly is) not be the right choice for scorching shred or metal but if you want the listener to hover on lush, round, hairy, bal I mean individual notes >.>.... don't fk around with the FETs. There's not much comprehension among guitarists on what sounds good isolated Vs. in the context of a mix. Bipolar transistors and alnico speakers do tend to initially SEEM like they won't work in a lot of rock formats but start slamming them with bass and compression and they fcking pwn when it comes to being semi-heavy while retaining clarity, George Harrison and Brian May come to mind as well as Campbell. Not bad company to keep.
Thank you for getting straight to it and not giving a 10 minute intro of you talking.
There are so many design trade offs, it is far more than type of amplification device. Bias current which sets operation point, gain, bias current vs gain ratio will make significantly more difference then active device used. By the way MOSFET (Metal Oxide Semiconductor Field Effect Transistor), JFET (Junction Field Effect Transistor), BJT (Bipolar Junction Transistor), just so you know.
J FET. my favorite boost/overdrive "transparent" pedal.
I agree it. Jfet is my first choice when wanna push the signal.
The JFET's distortion in the video is most like tubes/valves, similar to fast, high quality tubes that were used in radio equipment.
tube like sound, Good S/N ratio! I love it. But gain is most low, need attention.
Great demo
now this is a good video
Simple jfet boost, it would be the jhs mini bomb/Escobedo duende type circuit ?
Yes. but I made few modification from mini bomb type schematic to be hi-fi as much as my guitars need. Changing cap value, add 100pF LPF, etc...
From cap 100nf to 100pf or cap 100nf add series 100pf
There is no typical sound for Bjt, Mosfet or Jfet, it depends on too many factors. Apples and oranges. The lpb-1 is not a clean boost, it's a mild overdrive no matter where the volume is set to because the gain is fixed. Plus, the input impedance is terrible (tone sucking) ,the bias is not so good so the headroom is not optimal and the gain is too high for 9v. There's way better bjt booster than the lpb-1 with better impedance, bias method, and gain. For the mosfet, the SHO is actually a well designed circuit in my opinion. The input impedance is high when the gain is low and low when the gain is high which is good to tame the upper frequencies when it distorts. The gain is adjustable so you always have a good noise to level ratio. The SHO is coloring the sound a little bit though, being a little on the bright side. A more transparent mosfet boost would be the AMZ mosfet boost. As for the Jfet, it's not specified which circuit it is but the characteristics of all JFet varies greatly. J201 have very little headroom in general and mpf102 have more headroom which leads to differents sounds and uses.
LPB-1 is okay if you put a boss tuner in front of it for the buffer. but yeah i think if i was building my own version i would put a JFET buffer at the input stage of it
@@ryanmelvey8764 The LPB-1 will clip a strong signal (like a humbucker or a hot single coil like a p-90) even if you put a buffer before. It will solve the input impendance though. I don't say that the LPB-1 sound bad, it doesn't color the sound very much unless it clips. If your guitar has regular single coil like a strat for instance, it probably won't clip or won't clip enough to be obvious. The configuration of the J-Fet buffer matters a lot for the headroom. You can use a single high value resistor to ground at the input in a J-fet buffer and still have a decent headroom if the J-Fet that you use has a high Vp. A good value would be around -2.5v. Otherwise, you can use two resistors of equal value, one to the ground and one to the V+. In that case, you'll bypass the J-fet Vp. but the input impedance will be around half the value of the resistors you use and it shouldn't be too high because high value resistor are noisy.
Preferring the Mos-FET or the J-FET is like asking if you prefer 1.2k bumped in mix or 1k. The Mos-FET tightens the bottom a little and the J-FET is a bit more open and jangley but both produce a sound more ceramic speaker specific. The 2SC1815 Bipolar gives a much wider less compressed spectrum, less punch but more open and chimey, more old-school Hi-Fi sound, closer resembling an alnico speaker effect. I like them all but the 2SC is a stand out. To my ear, that's getting into Mike Campbell (guitarist for Tom Petty) territory. It might (ok, almost certainly is) not be the right choice for scorching shred or metal but if you want the listener to hover on lush, round, hairy, bal I mean individual notes >.>.... don't fk around with the FETs. There's not much comprehension among guitarists on what sounds good isolated Vs. in the context of a mix. Bipolar transistors and alnico speakers do tend to initially SEEM like they won't work in a lot of rock formats but start slamming them with bass and compression and they fcking pwn when it comes to being semi-heavy while retaining clarity, George Harrison and Brian May come to mind as well as Campbell. Not bad company to keep.
Sad thing... My favorite boost point is 1.6K...(and 200Hz for bottom!) So I made one knob custom graphic EQ!
@@yamagensdevileliet lol, rock on.
I liked them all!
me too! and each has different advantages
Jfet sounds like old-school tube stuff.
would have been better if the guitar signal was totally clean
I think so too.
Bipolar is the best for gain saturation, punch n rock
Mosfet on middle of jfet and bipolar On my opinion the best Sharp, low thd and natural musical
Jfet or Mosfet for chords, Bifet for the leads 🙂
Good choice, i believe! add Low and High pass filters and you'll be more happy b!
high level of transconductance on that bjt it clearly goes into nonlinear region serious harmonics of higher order the jfet is way better
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bipolar is more gain to me
MPSA18 or 2SC1815 is my recommendation!
Conclusion: they all sound the same