With my VT Bass cabsim bypass project getting more complicated I figured that I would do a simple mod to my Joyo AC Tone to make it more like the Liverpool by removing one resistor (R9, I think). Great plan only the PCB in my AC Tone is completely different from the one in the AC Tone thread. :( The...

This is a really great thread and I put together a PDF with the initial posts along with their attached drawings and added in the Liverpool schematic from another thread. I have attached the file to this message or you can view and download it from my page on Box.com: https://www.box.com/s/t0yj65rsh...

Can someone post result schematic with speakersim bybass? =) based on Liverpool schematic somethere in ththis read. it would be perfect ;) thx for your work ) I am putting together a PDF file based on the various posts here regarding the cabinet simulation bypass, with all of the appropriate drawin...

Glad to see you checking in, 12Bass- I have been studying all of your posts here about adding the cabsim bypass switch to your VT Bass. I was going to suggest starting your own thread specifically about wiring up cabsim switches so the information isn't buried in 19 pages with 350+ posts. Can you po...

Here is a folder on my Box.com page that has all of the drawings that I have collected from this thread. I will continue to add more files to this folder. https://www.box.com/s/264rqj7469bk2wz3fqak New twist on game plan for cabsim bypass on my "Version WTF" VT Bass: rather than focusing o...

I came up with a game plan to add a cabsim bypass to my "Version WTF" VT Bass. I can tap the bypass signal from either Pin 6 of the module or a pair of copper pads which have a resistance of 22k to P6. There are 3 pair of double pads near the module- the pair closest to the module has a 22...

circuit board!

Yikes- the PCB on my VT Bass does not look the same as the other boards posted here. :? The markings on the back of the board are: UV_21 1020 HS3 . . . 94V-0 The "1020" appears to be a date code punched into a light block on the pcb The 8 pin module is CH34-6 It looks like I may have to re...

Link to stylized drawing of latest version of speaker sim bypass mod (basic, not showing capacitor for reducing treble, pot mod etc.) Component J2 (pointed by purple arrow with a cross) must be unsoldered and removed. Thanks for the color-coded drawing! A slightly different approach occurred to me ...

I found the answers to those questions:
C11 would be tapped at its junction with R13 and R14
It looks like Terminal 1 of the pots in the schematic would be the "cold" terminal (the grounded terminal on a typical volume control.)

Now I just need to find where to connect the pre-sim signal...

I think that taking the pre-sim signal after C11 is a definite improvement from the previous bypass arrangement; the level discrepancy is far more manageable. Looking at the follow drawing which terminal of C11 are you referring to? (I haven't located the schematic in this thread yet- I was waiting...

Finally, because the pedal is so bright sounding, most VT Bass users end up keeping the treble well below 12:00, often closer to around 9:00. To mitigate this, I inserted a 22 k resistor between legs 1 and 2 of the treble potentiometer; this tames the overall brightness and makes the range of the t...

I was wondering if anyone has a schematic for the Chandler rack mount TDR-101 Tube Driver. It is quite different from the original 4 knob pedal- which I bought in 1986/7 but traded in a year later for the rackmount version. :slap: (I should have gotten suspicious when the store was offering me the f...