Amps and effects
Got a ZOOM Multispomp MS-70CDR on the workbench for a custom paint job.
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 .
The motherboard holding the ZFX-3 DSP.
Everything removed but the display and the mechanical parts for the switches.
Finally the chassie with everything removed.
/Krister
I’ve starteed working on the Laney amp as mentioned in an earlier post found here. I had it recapped and with no tubes, slowly brought it up to main voltage. Here’s a picure of them new caps.
Here’s the preamp section.
As it has fixed bias but not adjustable I added a bias pot and measure points accessible from the outside on the back of the amp as seen closer in this image. I’ve also installed new 1K screen resistors instead of the 470R :s.
Here’s the back panel with the bias pot and the measure points.
Time to power it up with tubes, I had the bias voltage set to -54VDC as in it’s original state. Checked with dummy load and scope and all voltages are in specs. Also changed a few resistors and the master volume pot installed before I recieved it.
Now I just hope it plays as it should, well see.
/Krister
Recieved some parts for the Laney Klipp100 restoration.
/Krister
Here’s the first prototype of the zeta sound BULL. With red indicating led and red knobs.
The circuit board
/Krister
An old Laney amp that needs som tendering.
Blows the main fuse. Tinkered with as it has a master volume pot installed and traces of other activites.
Components close up.
Checked the power transformer and it seems to be functional. I’ll start with recapping them old electrolytes.
/Krister