- #Bk butler real tube mod#
- #Bk butler real tube driver#
- #Bk butler real tube pro#
- #Bk butler real tube free#
#Bk butler real tube pro#
Most players find a sweet spot about 2:30 - 3 oclock on the control.Īll in all, it is a pro tool type of control that each player can set to their own subjective taste. It does not change the EQ directly but because the way the tube responds can be varied you will hear EQ differences at various settings. Technically it varies the electrical strength of the tube and that affects gain, texture and dynamics.
#Bk butler real tube driver#
The Bias control also adds dynamics and allows you to custom match your Tube Driver for any particular pickupamp combination.
#Bk butler real tube mod#
Incorporate the Bias mod, heres a description of what the bias mod actually does from the B K Butler website: The Bias control is very helpful as it adjusts the amount of current applied to the cathode of the tube.Įric Johnson used to spend a lot of time looking for perfect tubes to use in his standard Tube Drivers, but now he can just set the bias easily with the stock tube. So, what am I planning to do: 1 - Make this thing True Bypass the bypass switching currently employed by Overlord is terrible, a switch to true bypass will greatly improve the bypassed tone. Now what I want to do is combine the best parts of each of these variations into one and modify my Overlord into the ultimate tube overdrive pedal.
I took a look at various schematics with a view to modifying the Overlord to full-fill its true potential.Īnd the newly updated Tube Driver itself (with the Bias mod).Īnd another version by Bajaman - The Real Tube Overdrive with a regulated power supply and simplified tone control. Using a REAL 12AX7 vacuum tube it creates realistic tube overdrive and distortion tones It has some close relatives.
#Bk butler real tube free#
The Tube Driver runs in "starved plate" mode, so the plate voltage is only around around 30 volts.Have fun, enjoy the blog - Fred Briggs:-) CONTACT ME Feel free to get in contact with me about anything you see on this blog or with any general questions about guitars, amplifiers and effects, Ill be happy to answer Just click the button above to email me directly or alternately my email address is fredbriggs2007 at googlemail dot com. 12AX7 tubes typically get 150-300 volts in a high voltage circuit. The tube requires two different voltages - one for the heating element and one for the amplifying elements. The standard negative voltage grid bias along with a negative 12 volts applied to the cathodes helps the tube exaggerate the distortion in a unique way. Rather than generating most of the distortion, the vacuum tube applies its unique characteristics to color the distortion. It passes through a resistive divider into 1/2 of the inverting tube gain stage, then through another resistive divider before going into the second inverting gain stage of the tube. This is where the primary distortion is generated before signal goes to the pair of triodes in the 12AX7 vaccum tube stage. The op-amp is set with a high gain to produce signal clipping, with the gain level controlled by the drive pot for a maximum around 350. It then it goes to the other half of the op-amp, acting as an inverting gain stage. The input jack signal goes to 1/2 of the op-amp first, acting as a low impedance input buffer. Rather than using an external power supply transformer like modern pedals, an internal step down transformer reduced the line voltage down to +-15 volts DC. It is totally different to how preamp tubes perform in a typical high voltage circuit. THE TUBE DRIVER CIRCUIT - The Tube Driver has a somewhat unique design compared to other vaccuum tube-based overdrives.
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