Just got to post some pics of this one.
This one uses old BC184 transistors and its got the date 7 FEB 1974 stamped inside the chassies, nice.
/Krister
Repair of a Colorsound Supa Tonebender
Designing a new tube pedal update 1
Got the DC converter circuit board fabricated and populated. Testing it with the tube circuit connected.
A bit diffucult to se but It reads 245,7 VDC
/Krister
Maestro PS-1A update 6
Here’s what it looks like with some graphics.
I’ve fixed one issue with the speed preset switch, it could sometimes skip one of the three speeds, jumping from slow to fast skipping medium. It now goes steady from slow (1Hz) -> medium (2Hz) -> fast (7Hz).
I’ve made the depth trimmer available from the bottom lid and added a trimmer for the fast speed as my client requested, adjustable 3- 7Hz.
So lets try to list what differs from the original.
- I’ve used 2N5952 fets instead of the 2N4303.
- It’s got a new input buffer suited for guitar.
- It powerded by 9VDC.
- Adjustable high speed.
- The speed selector circuit, tap the switch and change the speed.
/Krister
Designing a new tube pedal
Decided it was time to start working on a new tube pedal. Just sharing some picture of what’s to come.
/Krister
Ampeg/Hagström Patch2000 service
This set of rare equipment arrived the other day for service. I’m told it will not interact with a synteziser.
Here’s a picture of the Ampeg pedal hooked up for testing and calibration.
I could not find anything wrong with the Ampeg pedal, though it did need a new calibration. The old electrolytic capacitors will also be replaced.
/Krister
Maestro PS-1A project update 5
Soundclips of my PS-1A clone
/Krister
Maestro PS-1A project update 4
Got the pedal up and running. Doing some tweaking to the circuit calibrating the trimmers. Sounds good! I’ll try to get some soundclips up.
Gutshot
/Krister
Maestro PS-1A project update 3
Boss DS-1 OD mod
Turning the Boss DS-1 into something more of an overdrive, giving it a more dynamic response. Changes are made to the transistor booster stage, OP-amp gain stage and the overall frequency respons. Check Thomas Ziden as he gives an somewhat unusual pedal demo.
/Krister
Maestro PS-1A project update 2
Had the circuit board fabricated for the PSU and the presets controller populated.
Testing the presets controller.
/Krister