Fully Parametric Tube EQ (with gyrators)


Posted on Feb 6, 2014

A fully parametric tube EQ and my best bet seems to be `merging` these two schematics into one so that i can get a tube-based gyrator section (with adjustable Q, Freq and Gain) and use ICs for the input and follower stages (going to use this on a home-built mixer so reducing number of tubes is the reason). I did this schematic in hopes of understanding things better. I basically


Fully Parametric Tube EQ (with gyrators)
Click here to download the full size of the above Circuit.

just replaced the transistor with the tube. I tried simulating it in a Spice program but didn`t work for me - i`ve never tried simulation before so probably a PBCAT issue (problem between chair and terminal). I am totally new to `designing` any circuits, so this schematic may have some laughable elements, but hey, gotta start somewhere. By the way - i hear that the Electro Harmonix Tube EQ pedal uses a "detuned Twin-T" type format, tho i don`t what parts of theirs are tube or IC (nor what they mean by `detuned`). my one question is about boost-cut. on the schem there`s a lone. 5meg pot connected to the grid of V2 that is unmarked (to the upper-left of V2). is this boost/cut for the bass section and secondly, where does a boost-cut pot go for the treble stage (i don`t see one) Since that`s a 2-channel, the treble channel need not be made in the first go-round, and the cathodyne could be made from the first triode and the EQ powered from the second, in the same envelope. That gives 1 mini tube socket per channel. When you mean the feedback loop of a cathodyne-do you mean a cathode follower-but I didnt think a cathode follower had a feedback loop am I being dumb-am I missing something I don`t have the ability to frame it into the original circuit, but a cathodyne is a phase inverter that pulls a non-inverted signal from the cathode, like a cathode follower, and an inverted signal from the anode, like a standard gain stage,...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Sequential flasher
    Peak-program-detector
    3A Switching Power Supply
    IC 723 Power Supply Circuit with Current Indicator
    Microcontroller-based automatic night light circuit
    mosfet low dropout charger circuit
    embedded webserver.
    Domestic Seismic Alarm
    Ultrasonic remote control dimmer light circuit
    One way to prevent reverse polarity of the DC power supply circuit
    DC motor armature series resistance one way operation start dynamic braking circuit



    Top