Project overview:
Our Amped S-bass preamp revitalizes the harmonically rich sound and legendary performance of the Ampeg SVT. Get five frequency bands mid boost / cut rotary switch and an improved mid-frequency boost/cut frequencies slightly – 220Hz, 440Hz, 880Hz, 1k8Hz, and 3k5Hz – that gets as close as possible to octaves of “A 440 “.
Introduction
The legendary Ampeg SVT is a bass guitar amplifier designed in 1969 to be a stand-alone amplifier or “head” as opposed to a “combo” unit comprising amp and speaker(s) in one cabinet. What made it a vital amp for bands playing in large venues was its prolific sounding and capability of 300 watts output at a time when most amplifiers couldn’t exceed 100 watts output.
The amp has been through many design changes over the years but is still in production today, maintaining its status as one of the greatest amps of all time. Now, you can have it in the shape of a pedal!
The original version uses one 1P8T rotary switch offering 5 different eq responses. However, this leaves 3 positions with no effect at all.
This was improved on version 1v1, where we replace the 1p8t for a 1p12t which you can configure through the washer for using only 5 positions.
Controls
Potentiometers
- Bass
- MID
- Treble
- Gain
- Level
Switches
- Bright
- High
- Low
- Depth
For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum.
For any technical questions regarding this build, don’t forget to check out our Facebook Group and our forum at Free Stomp Boxes.
Sten –
Now this is a really great pedal! I built it from a Musikding.de kit and I use it as a preamp for my DI sound.
One thing to note: In 2023 Bajaman, the creator of this circuit, wrote on freestompboxes.org that the value for C3 should be changed to 4.7nF and R7 should be 560k. The V1.1 build documents still list the original values.
Reference: https://www.freestompboxes.org/viewtopic.php?p=294226&sid=20a2118af03c6ba79f5c2807e7a92ab5#p294226