Here is the second installment of my bass amplifier series - the Ampeg SVT in 9v pedal friendly format.
Plug this pedal into any high wattage power amplifier and experience the Super Valve Technology sound without tubes :wink:
This design is based on the original Ampeg SVT but with the 5 frequency bands mid boost / cut rotary switch used in the later SLM MkII model.
I left the bass cut option in the ultra bass switch control out as well just as they did in the MkII :wink: However I modeled the...

Based on conversations I've been having lately with Modman, I decided to pick up an upmarket load box to see what that's all about. I had experimented with the concept a bit way back when I worked for Weber and was making attenuators all day. Lots of people (at least in the TGP scene) think this Suhr one is the hot stuff (or was the hot stuff a few years ago :lol:), so I nabbed one. Inside isn't a surprise: resistors, caps and a couple inductors. Usual things for a reactive load. Anyone...

I’ve always liked phasers, in fact one of my first pedals I’ve ever built was a Phase 45 clone. Not only I liked how it sounded, another main reason for choosing it (other than the complexity) was that I only needed two matched JFETs instead of, for example, four for a four-stage phaser.
I’ve been sitting there, content with my box, for some years, until recently I’ve heard of the Project 447 phaser on an old ETI magazine. It wasn’t perfect by most accounts (the long string of 741 op-amps in...

Hey lovers of the deep tone,
attached you can find my attempt to trace this big tank.
It's my second attempt to trace a pedal so please be kind. I used a continuity tester and the magnifying glass app with the flashlight of my cell phone to get it done. The schematic is made with Kicad.
Unfortunately I don't have a lot of knowledge in electronics. I don't now exactly which component is part of a feedback loop and which is a high pass etc or (and) especially for this pedal which component is...

Does anyone know what Pro Co has done to the RAT to make it a FATRAT? I'm talking actual circuit and/or component changes not sound/features. If anyone has any gut shots or an actual verified/traced schematic that would be great. I'd like to update my comparative multi RAT schematic (below) to include this new RAT variation so I'm really curious as to what they've done.

Shockingly great sounding pedal from Memphis. Guts and PCB, I'd like to trace a schem.

Picture020-1.jpg Picture018.jpg Picture017.jpg

Interesting to me is the number of wasted traces and empty holes. Clearly they manufactured 2 or 3 boards and built different effects by populating different areas, but i wonder what else they made with this board.

EDIT: forgot to mention that this is AFTER i already true bypassed it, it had the usual spdt switch from the 70's.

I thought this one sounded decent for a chip
i opened the boost / dist combo box but the smt parts
are impossible for me to see and it was a little harder to
tell where each was
i need glasses but i keep spending money on gear, ha !

I thought the sinle boost pedal sounded better than the combo version
but that may be my imagination as i didn't listen to them at the same time

I can post pix of the combo , or send it

whatdya say ?