10/18/4
Put the new MS decoder board in the old MS decoder box, and wired it up partly.

10/27/4
Problem-
Neotek Series II talkback switch (left side) not working.
Solution-
Replaced the switch.

"Problem-
Eventide Omnipressor - hum on the output

Solution-
Strapped the audio ground to the chassis ground at a good star-point near the power inlet."

what exactly does that mean? and what did u strap the things with?
thanks i hate hum and buzz and if you dont mind, if there are anygood ways to get rid of it for anything please let me know.

"Problem-
Eventide Omnipressor - hum on the output

Solution-
Strapped the audio ground to the chassis ground at a good star-point near the power inlet."

what exactly does that mean? and what did u strap the things with?
thanks i hate hum and buzz and if you dont mind, if there are anygood ways to get rid of it for anything please let me know.

There was a wire going from the ac ground (117 Volt wall outlet) to the chassis and nowhere else. The audio ground reference was derived by the power supply. There was no direct connection to the ground pin. That audio ground was used for the Pin 1 audio connection (audio and shield ground for outputs and inputs). So the shields on the audio cables weren't being grounded as well as they could have. Soldering a wire from the ac ground to the audio ground (strapping) improves this problem. A star ground is just having one point of ground reference, preferably near the point entry for all things that need grounding to strap to.
Hope that helps.
Getting rid of buzzes and hums in general is a large subject. I couldn't possibly cover it all. Some good reading material can be found on the web.
Books that have helped me include-
"Handbook for Sound Engineers," and
Yamaha's "Sound Reinforcement Handbook."

somebody been a little busy with their new tape machine? you're still doing the tech work, just not keeping a journal, right?

i'll fill in for you for a moment...

Problem : Tascam TSR-8 channels 3 and 4 don't do jack
Solution : Good question

Problem : Shoes are too tight
Solution : Remove third, fourth, and fifth pairs of socks

Problem : Unable to do nearly as good a job in this thread as Greg does
Solution : Canadian Whiskey!

greg wrote:11/6/03

Problem-
Eventide Omnipressor - hum on the output

I always think of the following when I see the above:

greg wrote:Solution-
Taught the Omnipressor the words.

It's probably only funny to me.

toomanyhelicopters wrote:Problem : Shoes are too tight
Solution : Remove third, fourth, and fifth pairs of socks

hmmm... I think you'd actually have to remove the fifth pair, then the fourth pair,and then the third pair.

mtar

2/8/5
Sounds of settling back in the chair. Finding that ass groove.
"This place is a mess."
Sounds of finding an intern, slapping, then sweeping.
"Ahhh"


Problem-
Older Josephson E-22 prototype not working.
Solution-
Screen dome on the back was whacked by a drum stick and bent in far enough in to short to the capsule solder point. That point is covered with something on the new ones for probably that reason. I popped off the screen to re-dome it. It works fine now.
Problem-
M-S Decoder prototype,
I destroyed a regulator while testing it a long time ago.
Solution-
Replaced it. It now works fine.
I spent the rest of the time finding the best way for the output trim to work. I decided to go with a line trim that gives you 6 dB of gain on the top end and a little more than 20 dB attenuation on the bottom. This is much like line trim pots on consoles.

Hey, I was just the 11,000th view of this thread!!!!
Now that's cool.

2/24/5
More M/S Decoder building in the last few days.
Problem-
Neotek Elite Channel 4 mic preamp distorts and has irregular gain. This was originally noticed when a Josephson e22s mic was "farting-out" on a tom.
Solution-
I checked the phantom power at the mic panel with that mic plugged in. Sometimes a weak connection between the desk and xlr connector will give you a suspicious voltage. That looked fine. I then started testing the pad switch and pot. The pot was bad. When I mic'ed a boom box I discovered that the pot didn't give anymore gain after the 30 degree mark. Under some pressure the pot will track correctly. It will be replaced.