If you weren't quoting lyrics, I'd be a bit concerned for you.ahh.. i did that with one of my 4DD-5's, played around with some pots and it went totally goofy!
although it wasn't working properly in the first place, which is why i took it apart and started tinkering with its' innards!
lesson learned; leave the fiddling about to the experts. oh and Uncle Ernie. he's an expert at fiddling about, fiddling about!
Imagine someone like xraytonyb (Tony Bevilacqua) at youtube doing a video on it.
One way to determine if the noise is coming thru the wiring or thru the air is to take each piece of equipment at a time and rotate it slowly 90 degrees. If this changes things, the hum is being picked up thru the air.
If the hum disappears, leave the item rotated.
Circuit of 405 and 5436 shows a lot of test points - but not what to expect there:
i needed a fallout shelter and an asbestos blanket last night after the stupid cow out the back started making toast at 3am and nearly burned the place down!
Hey, who needs sleep ‘round here anyway, it’s close to 3am here and I’m posting up instead.i needed a fallout shelter and an asbestos blanket last night after the stupid cow out the back started making toast at 3am and nearly burned the place down!
ahh.. a chorus of interlinked smoke alarms is just the thing to perk you up in the middle of the night.. i shouldn't whinge, those little alarms save lives.
Any RFI picked up by the power cord would be 100% filtered out by the power supply components.Hey, who needs sleep ‘round here anyway, it’s close to 3am here and I’m posting up instead.
Is there even the smallest chance that the old power cord of the Demod. is acting as an antenna somehow; aren’t Bose radios set up with an antenna in their power cord?
I still tend to think it boils down to ground gremlins & hopefully will be solved. But your earlier post gave me some good food for thought while at a couple of soccer games today. To the mentioned buzzy dimmers & other suggestions I'll add: ham & CB radio XMTR's.
I've also thought, if it's possible to filter out most of the actual hum from a sample I'll be Uploading soon; leaving the buried voices in the audio and boosting those. That way, I can listen for what's being said and it may be an indicator I'll recognize for where it's coming from (cable/DSL/radio/etc.)
Pulling unknown voices out of the ether. This could be getting into Twilight Zone territory. I mean, what if you can understand the voices and it's someone you know who is dead?
Well that's how it goes when you literally live on "Transmitter Road"!
I notice a lot of gear in my Quad/computer room has little clamp-ons like these on their power cords- i.e. Monitors, NUC, Involve gear etc.; is that what those are also?
Yup. Those came to popular use as switching power supply's & other digital stuff became potential emitters of noise & RFI. In fact if you look at a lot of digital stuff you will find a notice that goes something like;" This unit conforms to the requirements of FCC Part 15." Now this is interesting because Part 15 is an old regulation, pertaining to the strength of low power transmitters, like CB walkie talkies!! Again I don't think your CD-4 power lines are acting like an antenna but there still may be some power line noise that the ferrite filters might reduce.
hum for folks to check out. I boosted them about +20dbs already.
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