Beta Preamp kit

Item number: 4491

Lead and Bass Amplifier.

Category: Boost/Preamp

Enclosure: BBS drilled+ 11,00 €BBS+ 8,50 €none

starting from 56,00 €

Final price incl. VAT, plus shipping (mitttel)

Available.

Shipping time: 3-7 Working days

Description

The Beta Preamp is a single-channel pedal recreation of the Beta Lead and Beta Bass amplifiers, unique in using overdriven CMOS stages for their drive tone. The kit is including the parts for the Bass and Lead version.

This kit contains the PCB and all necessary parts. The enclosure can be selected, please select 5 knobs, up to 19mm diameter, for 6,3mm shaft separately.
Here is the bill of material: bill of material

This project is by Aion Electronics, in collaboration with Musikding. If you have any problems with the contents of the kit, please contact Das Musikding (Klaus).

Here is the direct link to the manual with layout and schematic:
Instructions

Instrument:	Guitar Bass
Effect-Type:	Amp-Sim

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Total entries: 1

C-MOS based preamp, also great as OD/Distortion.

Very pleased with this circuit. I wasnt very experienced with C-MOS gain effects, so it is a really good surprise.

Agressive, bright and sharp distorted sounds.

I could not choose between Bass and Lead versions : I used two 4PDT toggleswitches to modify the seven components involved in the modes. All the caps on one 4PDT, all resistors on the other one. There is just enough space to put them in the enclosure, on both sides of the 3PDT footswitch.

I tried the circuit with guitar and bass. 3-bands active EQ is effective in both Lead and Bass modes. On my build, Mid and Treble have a greater range of action than Bass. A modification to increase the bass frequencies even further could be interesting, but its not really required in my opinion.

Bass and Lead modes are both great with guitars, the Lead mode is a bit less effective with a bass, so I would recommend guitar players to use extra toggleswitches, to switch between Lead and Bass versions. Its probably not worth the trouble for bass players.

Something weird happened when I turned the Treble fully CW. Popping and white noises as if some part was overloaded. I noticed that the same issue happened to other builders. A 10k resistor between the Treble pot lug3 and the pcb pad solved it.

I made a quick build report here :
https://www.diystompboxes.com/smfforum/index.php?topic=36392.msg1265905#msg1265905

All my thanks to Aion and Musikding for this preamp circuit !
justin a., 07.06.2023