Amps and effects
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
Checked the switch for D.TIME due to the problem of changing from 200mS to 800mS of delay. Found it’s not the cause. Had the wiring from the switch resoldered and it’s hey, it’s back in normal operation! Also fixed the knob for E.LEVEL wich was glued in place.
/Krister
Got a Boss DD-3 on the workbench.
Got some problem with the pots I was told. Nice and clean on the solder side of the circuit board.
Here’s a picture of the component side.
When played it seems the select knob has trouble changing from 200mS to the 800mS setting.
/Krister
Got two Rats of different generations on the bench for repair. The v2 to the left, not working at all. The other one did not reach unity gain.
I had to replace a malfunctioning jfet source follower on the output stage on the old Rat.
The other one had already been messed with. There were several copper traces on the circuit board that had to be mended, the opamp was burnt and wires not connected. Managed to bring it back to life again.
/Krister
Got this one in for repair
Led would not lit at and it did not pass any sound. Opened it up and took some voltage readings. It did not get any coltage due to a bad battery clip.
After replacing the battery clip it powered up but the led L1 would not lit. Turns out the led was damaged. Had it replaced and adjusted so the circuit would go into bypass mode when the foot is of.
I like the way that the bypass circuitry is built. Never seen a led/ldr combo used with a hex inverter to control the switching fets, works fine on a wah pedal.
Also fixed some new screws for the bottom lid, the old ones where missing.
/Krister
A great chorus pedal the Boss CE-2. Got this one recapped, rebiased and modified from ACA to PSA specs.
/Krister
Got this one in for repair, would not make a sound.
Sometimes it’s an easy fix, when opening the back I found the 12AX7 preamptube at the bottom of the chassie. Just put it back in place and it was ready o rock.
I opened it up and took a look at the circuit. Besides from the single 12AX7 preamptube and the EL84 power tube there’s two JRC4558 opamps on the circuit board, so what we got is a hybrid of solid state and tubes.
/Krister
Got this nice video after the repair of an old Colorsound Tonebender. Thank you Thomas Ziden. Turns out he’s got two of them, lucky guy!
/Krister
Got this Coron tremolo pedal in for repair, It’s working but it needs new pots and the old tantalum capacitors will be changed.
A picture of the circuit,
/Krister
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