Malfunctional Zachry D250 mono block

Here’s a Zachry D250 solid state amplifier. It stopped working producing only a 100Hz noise. Look at them blue filter caps, seems a bit swollen.

Zachry D250 repair
Zachry D250

Here’s a picture from the bottom of the caps.

Zachry D250 repair
Zachry D250

Those caps are out of date. Had a hard time finding 15000uF 63V caps with a diameter of 35mm. Finaly found and ordered F&T :s with the right values but a diameter of 40mm. I should be able to fit hem.

/Krister

Power cord the wrong way

A word of warning. Never install your power cord like this!

Power cord
Power cord

Found it when replacing a bad power cord in an old amp. Had the new cord installed properly with the ground wire directly to the chassie ground.

/Krister

Laney Klipp100 channel mod.

Adding some optocouplers and making the klipp and the normal input selectable. Using either the switch on the front panel or remotable with a foot switch,

Laney Klipp100 channel switching
New circuit board with optocouplers added

The front panel of the amp with the new hardware added. switching with the remote input.

Channel switching

/Krister

Custom paint job ZOOM MS-70CDR

Got a ZOOM Multispomp MS-70CDR on the workbench for a custom paint job.

Zoom MS-70CDR customizing
ZOOM MS-70CDR

Opening it up we see that it consists of six circuit boards. One for each set of 6,3mm jacks, two for the for the switches and one for the pots .

Zoom MS-70CDR guts
ZOOM MS-70CDR guts

The motherboard holding the ZFX-3 DSP.

Zoom MS-70CDR guts
ZOOM MS-70CDR DSP

Everything removed but the display and the mechanical parts for the switches.

Zoom MS-70CDR guts
ZOOM MS-70CDR guts

Finally the chassie with everything removed.

Zoom MS-70CDR chassie
ZOOM MS-70CDR chassie

/Krister