Vox - WAH V847 - Classic Wah-Wah Guitar Pedal

Product Information

R2'= R2 can be considered as connected to ground, as it is indeed attached to the Q2 emitter that has a very low output impedance. The second stage is an emitter follower workingas a low output impedance amplifier of approximately unity gain: If you're keen on saving pedalboard space, you may prefer a combined wah and volume pedals, as these offer both types of effects in a single pedal. The Hotone Soul Press is a prime example of this kind of combi pedal.

True bypass circuitry is becoming a standard feature among today's pedals, which is why Vox has integrated this into the design ofits V847-C wah pedal. Thismeans that your guitar'ssignal does not pass through the circuit when the unit is switched off, ensuring that its tonal character is unaffected and not subject to colouration. Made in Japan However, the Gear4music extended warranty scheme provides an enhanced service, and is designed to offer a higher level of protection than many 'free' warranties offered by some retailers and manufacturers. Vox V847A: Updated version of the classic model, including SMD resistors and an additional input buffer stage.To engineer a warmer tone throughout the sonic output of the V847-C the impedance has been changed which adds to the power but also warms up the tone. Wah purists will swear by pedals equipped with an inductor, which were commonly found in vintage models and come in three main variations: Halo, as found in the Hendrix and Clapton-used 1966 Vox Clyde McCoy wah; red fasel, which crops up in a number of Cry Baby variants; and yellow fasel, which you’ll find in other vintage-voiced designs. The circuit is built using 2 cascaded transistor stages with a couple of passive components and an inductor; this reduced design makes the power consumption below 1mA.

Finally, while the V846-HW and V847-C are true bypass, the V845 and the V847A (like all buffered pedals) are not. This means that your guitar signal is still filtered through your pedal’s circuit – even when it’s switched off. After I turn off my V845, I often notice a decrease in volume and some slight distortion, especially on my bass notes. Final thoughts Please note that this extended warranty is currently only available on products sold within the UK, EU or EEA, and is subject to the terms and conditions as detailed on the extended warranty certificate provided. The gist of the design remains in how the resonant frequency of an LC filter made up of a fixed inductor L 1 and a fixed capacitor C 2 can be moved using a variable resistor VR1. The pedal has been designed with true bypass which lets the signal bypass the circuit when switched off so that the true tone passes through unaffected.

In the images below the shift of the sweeprange can be appreciated, using 0.1uF, 0.01uF (default) and 0.001uF.

Capacitor Reactance: It is the opposition of the Capacitor to the change of voltage through it. The built-up electric field resists the change of voltage between the capacitor pins. (reactance)XC = -1/wC(capacitance)

Tech Specs

The position of the VR1 potentiometer effects the value of the output impedance, but the overall number is between 630 Ω and 8.6K Ω, which can be considered as good output impedance. 5. How the Wah-Wah works. There are some popular modifications that players do to their pedals, you will see how they work and how do they affect the guitar signal: 6.1 Modifying the Wah-Wah Q factor. This is a promo video from Vox, so it’s quite salesy and doesn’t explain the amp settings used for each demo. But it’s one of the few videos that compares the V845, V847A and V846-HW together – with several noticeable differences in sound.