Self-made tone pedal Xotic BB Preamp clone Self-made tone pedal Xotic BB Preamp clone

Self-made tone pedal Xotic BB Preamp clone

Creamy distortion pedal Xotic BB Preamp

BB Preamp imageI made my own "BB Preamp" originally made by USA maker Xotic. This is the third self-made overdrive effect pedal after Klon Centaur and VEMURAM Jan Ray. The reason I was interested was because I learned that Lee Ritenour is using it as a booster. Some reviewers say it would create a "creamy" distortion. It seems that the basic sound is distortion type, but the distortion with the GAIN knob and the effect of the TREBLE & BASS tone knobs are exquisite. It may be a quite versatile tone pedal.

People say that "BB" is named after the Marshall amp "Bluesbreaker" that Clapton uses. I have never used the Bluesbreaker before, so I don't know the sound output, but I guess that the BB sound is not a vulgar metal distortion, but a elegant distortion. I look forward to completion.

About the circuit

The real BB preamp's circuit board is not glued or masked. The schematics can be easily found on the internet. The same ordinary switching diode (1N4148) as Jan Ray is put in the feedback of the operational amplifier to make distortion. After that, the treble and bass tone controls follow. It doesn't look like a special circuit configuration, but it may be different from other effect pedals. The tone control (Bass, Treble) is composed of a dedicated operational amplifier. This may be one of the reasons why there are many reviews that the tone control works well.

The input and output have an ordinary emitter follower buffer using a transistor (2N5088), and the impedance of the input and output drop to lower. Centaur and Jan Ray/Timmy do not use transistors. I guess that this circuit may create the unique sound.

BB Preamp schematics

PCB supplier

When I made JanRay clone, I realized that a printed circuit board makes my work quite easy. So I searched for a printed circuit board on the Internet this time. I bought it from a Polish board shop via eBay. The price is US $5, which is a little over US $10 including shipping fee. It is a single-sided substrate of paper phenol and its quality is high. It arrived in 15 days (form POLAND to JAPAN) by international mail after I clicked the purchase button on eBay.

BB Preamp PCB Link on eBay

Self-made BB Preamp PCB purchasing

Self-made BB Preamp PCB arrival

Purchasing parts

I bought all of the parts (parts, switches, jacks, potentiometers, knobs, painted enclosure, etc.) from the effect pedal parts mail order site "Garrett Audio" in Japan. It costed about US $ 50 excluding the PCB.

Self-made BB Preamp parts purchasing

The real BB Preamp board photo can be seen on the Xotic web page. The resistor looks like a metal coating, but it doesn't look like any special parts are used. So I chose the price-oriented general-purpose ones, resistors of 5% 1/4W type and cheapest capacitors regardless of the type.

About the bright red enclosure

For the enclosure, I purchased the standard size enclosure "HAMONND 1590N1" that fits to the PCB's size. The color is glaring red, and the color of the knobs is also bright red. It's different from the elegant distortion character, but I'll call it "Bloody Red BB-Preamp".

First, apply masking tape on the enclosure, then write the center position of each part with a ballpoint pen. And then arrange the actual parts (potentiometers, phone jack, switch, AC adapter jack) on it and decide not to interfere with each other.

Self-made BB Preamp enclosure marking

To make holes, mark the hole position with a screwdriver with a sharp tip instead of the center punch, remove the masking tape, and then drill a hole with a 3mm drill. At this time, pay attention not to deviate from the center position. After making a 3mm hole, widen the hole with a 6mm drill.

Self-made BB Preamp processing halls

The holes for potentiometers, jacks, and switches are different in size, so decide the hole size by looking through the actual parts while widening the holes with a reamer little by little.

Self-made BB Preamp getting started!

Self-made BB Preamp parts implementation

Wiring

Wiring inside the enclosure is done after attaching the potentiometers, jacks, led and switch to the enclosure. The wiring material is a 24AWG twisted wire type ( flexible wire) that I bought at Amazon. There is also a solid wire type, but I don't use it because it will break if it is bent several times.

Self-made BB Preamp banding wires

Self-made BB Preamp connecting wires

Self-made BB Preamp LED bondingThe LED fits just into a 3mm drill hole. With the head of the red LED inserted, fix with instant adhesive from the back side. The wiring between the potentiometers and the PCB should be as short as possible, but it is convenient to make it long enough to turn the board over for a trouble shooting. Please note that noise will be added to the wire if it is too long.

Sound output check

I made it with printed circuit board, so it worked on the first attempt. The printed circuit board is super easier than the point-to-point hand wiring that I did when making the Centaur clone.

The first impression of the sound is that the tone knob works well for both treble and bass as I want. There is no feeling that the midrange is emphasized like Centaur. Its tone character is HiFi audio-like and flat. If setting the DRIVE knob to "0", it can be used as a perfect clean booster.

It feels like distortion is applied obediently as I raise the DRIVE. It is different from the behavior like JanRay and Centaur where distortion is limited even if I turn the GAIN knob more. I feel that the distortion adjustment range is so large. It's a distortion pedal rather than an overdrive, but the distorted character sounds "elegant" as I expected.

Sound samples

The same phrase will be played twice. The first half is OFF (buffered bypass) and the second half is ON.
Recording environment: Fender Stratocaster -> Self-made Centaur -> ZOOM G3X (Fender Twin Reverb clean simulation) -> UR22mkII -> DAW (Studio One)

Chord phrase(MP3) : Gain/Bass/Treble all 12 o'clock

Solo phrase(MP3) : Gain/Bass/Treble all 12 o'clock

Self-made BB Preamp My effecter board

Self-made BB Preamp sound check scene

My "Bloody Red BB-Preamp" completed!

The enclosure I purchased this time has a rough surface, so I can't put a sticker on it. As with the JanRay clone, I put a sticker on the knob with only one letter, Drive, Level, Treble, and Bass printed. I am satisfied with the completion of my "Bloody Red BB-Preamp".

This is the fourth distortion pedal I made. I plan to add it to the effect pedal board someday, but for the time being, I would like to try it, independently comparing it with my self-made Centaur, my self-made JanRay, and purcahsed SD-1.

I've created a page about the tools you need to make your own effects pedals and the basics of how to make them. Please refer to it.

My bloody red Self-made BB Preamp