Just spent about two months off and on trouble shooting a Sony Mixer I have that I really like the EQ's on...
I have replaced a lot of the opamps with BB stuff, recapped the PSU and generally done some house keeping on the unit...
About 8 months ago it started developing this noise in the master bus...so I decide to track it down...
Right side of the LED meter all over the map as this AC erratic noise starts growing and growing...
Tear it down...1 million tiny screws, cables up the wazoo...sort of a "lets play sleuth when I want to be distracted" kind of project...no biggie....
Until I start getting pissed...opamps are good, trace down noise to the ground plane somewhere...take apart each and every board looking for bad caps/etc...nada...
Weeks...turn into a few months...this thing on my bench mocking me calling me names in Japanese "Big stoopid American you no fix me!"
"You hecka stoopid no smart electrons in you dumb boy"...sh*t like that every night...
I replace sliders, trade out caps, look for obsolete transistors and pull my hair out...
Ignore it, throw a blanket over it's mocking guts taking up space on my bench...
I even buy new probes for the scope thinking I'll get inspired...nada, nothing, zip,..
No help online...
Finally...tonite...I am using a jewelers lens going over it inch by inch in hopes of a light going off...and I notice an ever so faint looking maybe possibly a cold solder joint...I jumper it, solder it just to make sure...
WHAT???
A friggin cold solder joint after 20 years? (It was made in the 70's)...
1 solitary solder joint...hells bells batman...
Keep It Simple Stupid...
You ever out think yourself into a hole?
My bench is clear now...
I have a G-Pultec to build...finally.
I have replaced a lot of the opamps with BB stuff, recapped the PSU and generally done some house keeping on the unit...
About 8 months ago it started developing this noise in the master bus...so I decide to track it down...
Right side of the LED meter all over the map as this AC erratic noise starts growing and growing...
Tear it down...1 million tiny screws, cables up the wazoo...sort of a "lets play sleuth when I want to be distracted" kind of project...no biggie....
Until I start getting pissed...opamps are good, trace down noise to the ground plane somewhere...take apart each and every board looking for bad caps/etc...nada...
Weeks...turn into a few months...this thing on my bench mocking me calling me names in Japanese "Big stoopid American you no fix me!"
"You hecka stoopid no smart electrons in you dumb boy"...sh*t like that every night...
I replace sliders, trade out caps, look for obsolete transistors and pull my hair out...
Ignore it, throw a blanket over it's mocking guts taking up space on my bench...
I even buy new probes for the scope thinking I'll get inspired...nada, nothing, zip,..
No help online...
Finally...tonite...I am using a jewelers lens going over it inch by inch in hopes of a light going off...and I notice an ever so faint looking maybe possibly a cold solder joint...I jumper it, solder it just to make sure...
WHAT???
A friggin cold solder joint after 20 years? (It was made in the 70's)...
1 solitary solder joint...hells bells batman...
Keep It Simple Stupid...
You ever out think yourself into a hole?
My bench is clear now...
I have a G-Pultec to build...finally.