Discussion in 'Effects, Pedals, Strings & Things' started by papersoul, Mar 20, 2015.
Subdecay Liquid Sunshine is an excellent one.
Do you all know anything about the new Bogner pedals like the Wessex? Another thing that is important to me is that a pedal can work on the clean channel and dirty channel
I saw the Wessex and was very intrigued. The Earthquaker Devices Monarch is a FET pedal in the vein of an Orange amp input. Sounds pretty damn good to me.
No, it's an IC based distortion, no transistors (field effect or otherwise), and no clipping diodes.
You guys say FET but I have read a few times that FET is different from JFET.
Bad Bob Boost?
The tube screamer tone seems pretty dependent on the op amp/diode combination - not sure it could really be considered TS-like without that.
There are lots of jfet-based pedals that can boost mids though. For example, the Wampler tweed 57, while designed to be a 'preamp' type pedal, works great as a dirty boost - and the gain and 3-band tone controls allow quite a bit of flexibility.
How about a BSIAB (Brown Sound In A Box). I built about three or four based off some of the circuit schematics online. Very smooth sounding overdrive/gain pedal that can almost replace an amps OD channel. Here's a current ppage with build info. http://www.generalguitargadgets.com/effects-projects/distortion/bsiab-2/
A JFET (junction field effect transistor) is a type of FET (field effect transistor). In the EE world, I know a number of people that refer to MOSFETs (metal oxide semiconductor field effect transistors) simply as FETs, while people working in music electronics without a EE background tend to use FET to refer to either one. Most through hole JFETs are out of production, and they may or may not become less common in guitar effects as supplies dwindle.
The two types of transistors are different, as far as how they operate. A JFET is a depletion mode device, in that the control terminal needs to be biased to a lower voltage than the terminal which supplies electrons (in case of N-type JFETS) in order to be 'on'. This is how tube triodes work, and the similarity in operation is responsible for similarities in how they wind up sounding in simple amplifier circuits which are allowed to distort. They both can only take so large of a signal at the input before the device goes into saturation or cut off, resulting in clipping, and that signal size is tied more closely to inherent properties of the device (threshold voltage) rather than any biasing conditions. The transfer functions of the two devices (tube triodes and JFETs) aren't identical, however, which leads to slightly different characteristics at extremities.
The MOSFET (or MOS transistor, which is how people in my field tend to refer to them) is an enhancement mode device, which requires that the control terminal be biased above that of the source terminal for the device to be 'on' (again, in terms of N-type MOS, or NMOS). In the typical MOS amplification stage, the input voltage swing isn't limited by any inherent properties of the device, but rather by the supply voltage rails. Of course, as the size of the input signal grows, the linear ideal starts to fall apart, but it's not as rapid as in a depletion mode device. As a result, MOS gain stages tend to have more headroom than JFET stages before clipping, and as a result, you can get more clean voltage gain out of them. They can also sound sufficiently 'tube-y' with good circuit design. See the ZVex Box of Rock for an example, in addition to the Catalinbread WIIO and RAH.
EDIT: The output impedance of MOS transistors in equivalent circuits is typically higher than BJTs (bipolar junction transistors), but the transconductance is usually higher than BJTs, so BJTs have higher maximum gain.
As far as I know, there aren't any JFET based pedals that do anything similar to a Tubescreamer. The Tubescreamer uses op amps and it's not possible to simply swap them out for JFETs. However, it is perfectly possible to get a similar result with a JFET design. You just want to cut bass up front (small emitter bypass cap on the first stage, and possibly a small coupling cap between the first and second stage) and then cut highs at the tail end. I've screwed around with circuits like that a bit, and they're fun. I just hate dealing with sorting through JFETs, especially with a limited stash. They're trash devices, honestly, at least from a consistency standpoint.
Thanks, that was educational and a great help. Would you recomend zvex box of rox or those catalinbteed pedals?
My J&J OD is JFET and has a mid boost setting. Thanks, now I know to check out some Mosfet too.
VFE is now offering licenced versions of most of the ROG pedals. I've got the OLC version of the Umble. Great sound and very well thought out!
Yea, both the BoR and the Catalinbread MOSFET pedals sound great. The Box of Rock is a bit tubby sounding though. I'd recommend the Distortron over it it since it has a switch to tailor the low end.
Aha! This totally explains what happened to me. I got a Catalinbread 5F6 and I've been selling off all of my TS derivative pedals ever since.
I just thought I was crazy.
I will say modded Sonic Edge J&J OD and J&J v2 have kicked all my MXR, Way Huge, Maxon and Xotic pedals off my board. My J&J's seem to be capable of anything. Ben Fargen said these are JFET pedals and I know mine is modded by Ben with the best parts and a bass and mid boost switch.
Does Ben still make them? A search doesn't reveal any current production that I can see.
Ben no longer makes pedals, only amps.
I have a Subdecay Liquid Sunshine and Ramble FX Marvel Drive on my board. Both JFET, and they stack well.
I like JFETs, too.
Very surprised nobody's mentioned the Weehbo pedals, yet. They seem to be generally received as some of the best amp-in-a-box style pedals available, and some of the very best implementations of JFET design.
I own two JFET pedals, the T. Jauernig Kollmanation, and the Weehbo JCM Drive Ltd. Anniversary. Both pedals share something very special - a very realistic, complex kind of drive, full of harmonics and just 'huge' in every sense. They also both share an amazing level of touch sensitivity and dynamic response. This makes them sound and feel very real and 'amp-like'
The Kollmanation is a crunchier, more aggressive beast that can run the range from clean to raging, chunky metal grind, while the JCM Drive Ltd. goes from clean to about 80s rock, but with a more vintage slant to the tone. Both very versatile pedals.