http://music-electronics-forum.com/ General discussion about music electronics en Fri, 20 Nov 2009 22:37:14 GMT vBulletin 60 http://music-electronics-forum.com/images/misc/black/rss.jpg http://music-electronics-forum.com/ http://music-electronics-forum.com/t16228/ Fri, 20 Nov 2009 20:58:22 GMT I have a Peavey Gatekeeper which is perfect for our needs, except the gates close too abruptly. It has two controls for each channel - sensitivity... I have a Peavey Gatekeeper which is perfect for our needs, except the gates close too abruptly. It has two controls for each channel - sensitivity and release. The release control, though, acts more like a "hold" control, and when the gate closes it's way too fast.

I would like the release control to be more like a "fade out" control that allows us to choose how long it takes for the gate to close (say, up to three seconds after it opens) and when it closes it is a steady reduction in volume instead of a hard close like it is now. I can do the mod itself, but I don't know what would need to be changed and/or added. Gates are greek to me.

Can someone help with this? I have the schematic from Peavey.

Thanks in advance! ]]> Music Electronics swipesy http://music-electronics-forum.com/t16228/ http://music-electronics-forum.com/t16189/ Wed, 18 Nov 2009 13:12:13 GMT I have some parts burned on this one and need a schematic, can anyone help? I am will to buy if I can find one. Thanks I have some parts burned on this one and need a schematic, can anyone help? I am will to buy if I can find one.

Thanks ]]> Music Electronics ebrunswick http://music-electronics-forum.com/t16189/ http://music-electronics-forum.com/t16183/ Wed, 18 Nov 2009 00:54:19 GMT A friend at one of my dealer accounts emailed to tell me they were bringing over an amp. The Fender Bassman combo started smoking on the showroom... A friend at one of my dealer accounts emailed to tell me they were bringing over an amp. The Fender Bassman combo started smoking on the showroom floor. Problem is, they don't allow smoking in the store. ]]> Music Electronics Enzo http://music-electronics-forum.com/t16183/ http://music-electronics-forum.com/t16182/ Wed, 18 Nov 2009 00:48:47 GMT This is going to sound overly simple but I'm new to guitar electronics. I have a multimeter, how can I tell if some old pickups I bought for a few bucks surplus are working? I figured it would be a good way to get started learning. ]]> Music Electronics rbilleaud http://music-electronics-forum.com/t16182/ http://music-electronics-forum.com/t16148/ Mon, 16 Nov 2009 00:19:42 GMT Hey everyone, recently bought an old Technics C300 organ which I can't find a lot of information on.

It powers up fine but when I plug it into any mixing desk/amp (either with a single jack or stereo) it has a very weak signal.

At the moment I've got it hooked up to a AIWA amplifier (the kind used for record players) which I use to boost the signal but that creates a ridiculous amount of noise.

What should I start looking at as a probably cause that I can replace/fix?

There's also a number of miscellaneous problems such as a "Main Mix" switch that seems to do nothing and speakers (plus switch) that don't seem to be working. ]]> Music Electronics SimonomiS http://music-electronics-forum.com/t16148/ http://music-electronics-forum.com/t16059/ Tue, 10 Nov 2009 23:18:29 GMT Sick of messing with Loud Tech Any one have any comments on the new Kustom stuff MF is selling ? I ordered a KPM4200TNR head and a TNR215HBK... Sick of messing with Loud Tech
Any one have any comments on the new Kustom stuff MF is selling ?
I ordered a KPM4200TNR head and a TNR215HBK speaker
Also got a Kustom K150 Pa made in 70's from CL
Thanks for all the Kustom posts here. Trying to learn about working on old amps from you guys. ]]> Music Electronics jessadr http://music-electronics-forum.com/t16059/ http://music-electronics-forum.com/t16044/ Tue, 10 Nov 2009 06:35:09 GMT Does anyone know how to modify WT-800 D.I. to be "Pre" EQ section, instead of "Post" EQ? I have an 800c (Jan.1995)

Thanks ]]> Music Electronics clamarb http://music-electronics-forum.com/t16044/ http://music-electronics-forum.com/t15943/ Wed, 04 Nov 2009 00:57:06 GMT I've been eying this puppy on E-bay...

Transistor Semiconductor DC Parameter Tester Meter 294 - eBay (item 320359098594 end time Nov-07-09 04:41:32 PST)

I'm teaching myseld about electronics, and im looking for a basic device to test transistor leakage. I know there is plans outthere to build a small circuit on strip board, but it seems horribly inaccurate. This unit has a nice digatal readout and looks like it would work for measuring gain, but I dont understand the speaks enough to know if it will give me the leakage number. I'll be measuing mostly OC44, OC75, OC76, OC81D, AC128, and AC188.

bel ]]> Music Electronics belwar http://music-electronics-forum.com/t15943/ http://music-electronics-forum.com/t15933/ Tue, 03 Nov 2009 16:51:46 GMT Hello all, I am wondering where I can get or if I can get the pcb to swap out for the SPS1000/01 in the Behringer mixer board. We had and issue... Hello all, I am wondering where I can get or if I can get the pcb to swap out for the SPS1000/01 in the Behringer mixer board.

We had and issue where the fuse blew out on the board and then someone replaced it with a regular fuse and I beleve what we have is the slow rise circuitry was affected. I opened the case to find that R12 was missing one side of the resitor, but no charring of any kind. The relay seems to ohm out fine, other than the fact that I did not apply power to it to cehck its function. There may be a problem with one of the Mosfets in that cicuit as it showed short and think that was an earlier indication of an issue in that same slow rise circuit.

With there being so many issues on this board I was wondering if I can just replace the board. I am an old navy guy so board swap is where it is at for me, and I have been given authorization to do this by my boss. However I can go to component level if this seems to be an issue.

Basically I need help and this seems like the place.

Thanks ]]> Music Electronics ltelford http://music-electronics-forum.com/t15933/ http://music-electronics-forum.com/t15903/ Mon, 02 Nov 2009 00:50:10 GMT I just plugged in my finished 5F2 project for the first time, and everything sounds wonderful minus one thing. When the volume gets to about to about... I just plugged in my finished 5F2 project for the first time, and everything sounds wonderful minus one thing. When the volume gets to about to about 8, it starts to develop motorboating. My understanding is that its usually a filter cap issue, but I wouldnt think that would be my problem with these new spragues. Any other sources I should look at? Ground loops? ]]> Music Electronics EETStudent http://music-electronics-forum.com/t15903/ http://music-electronics-forum.com/t15893/ Sun, 01 Nov 2009 15:25:26 GMT This one came in for general service.....

After fitting replacement tube's and setting bias to 80ma per pair of tubes all seem well! But after an 1 hour's test things started to seem odd?

0n monitoring it's bias for 20 minutes it would rise to 110ma and even readjusting them to 80ma per pair it still did the same!
so more checks where done on it's bias voltages, all correct there -47 volt ok, now on reflowing of dry solder tracks and general componet checks all seemed well and I even tested the tube's in our tube tester no problems there:confused:

Now after speaking with marshall tech's regarding this fault, they said we've had the same thing and no matter what we did the amp still done the same as your stating to us. One tech said change it's main o/p pcb board and that's it done:thumbsup: so a replacement board was fitted and hey all is ok:) It turns out that it's a solder track problem and changing the board sorts the fault out.

As any one came across this problem before? ]]> Music Electronics amptech http://music-electronics-forum.com/t15893/