Maestro PS-1A update 6

Here’s what it looks like with some graphics.

MaestroPS-1A Clone zeta-sound
Maestro PS-1A clone
MaestroPS-1A Clone zeta-sound
Maestro PS-1A clone

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.

MaestroPS-1A Clone zeta-sound
Maestro PS-1A clone

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

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.

Hagström Patch2000 guitar and Ampeg Patch2000 service
The rare Hagström Patch 2000 and Ampeg Patch 2000

Here’s a picture of the Ampeg pedal hooked up for testing and calibration.

Ampeg Patch 2000 pedal service and calibration
The Ampeg Patch 2000 pedal undergoing some service

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

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