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February 17, 2019, 10:49:28 PM *
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 1 
 on: February 11, 2019, 07:11:10 PM 
Started by vrod - Last post by Ed Schilling
Victor, on old Magnavox TV's the Yoke (an xformer on the tube) would rattle. It was a common problem and drove people crazy. We fixed most by wedging toothpicks and shit in them. Stuff like hot glue and silicone had no effect.

I spoke with Don and he said it is possible something in the p/s is dying and could be causing them to hum. He doubts this is the case but it could be. He said if you can put pressure on them or squeeze them and the hum stops then it's probably just mechanical. If not he said you may want to have them checked out or just wait and see what happens.
Ed

 2 
 on: February 05, 2019, 10:19:44 PM 
Started by vrod - Last post by Steve F
I’ve quieted transformer hum by first making sure the laminates were tight, then checking the chassis mounts. I got lucky in that nothing happened to the windings themselves. Perhaps high temperature epoxy could be step three. Ed’s right though. It can be difficult to solve.

steve

 3 
 on: February 04, 2019, 11:45:52 PM 
Started by vrod - Last post by Ed Schilling
VRod, yes, the windings and laminates can vibrate inside the case. It does not mean it will fail. Can be a bitch if even possible to eliminate,
Ed

 4 
 on: February 03, 2019, 10:38:27 AM 
Started by Luddite - Last post by Luddite
Since I'm grateful to Ed and Steve F for their "The great Heil AMT is on sale" posts, I thought I'd (hopefully) return the favor to anyone powering Ed's FFRS subs.

Crown is offering $50 off their XLS amplifiers through February 28, 2019 https://www.crownaudio.com/en/promotions/more-power-for-your-pa in the US only.

Just an FYI for those who might be interested.

Update:  Could this be "bait and switch"? The link above shows, say, the XLS 2502 for $550 (list @ $600) but as an experiment I added it to my cart, and the price shows $600, but a new list price of $650!  I'd suggest a phone call to them if someone's considering a purchase.

 5 
 on: February 03, 2019, 07:29:53 AM 
Started by vrod - Last post by vrod
To everyone who has helped, is it possible for transformer coils to hum and not the transformer housing itself? Do they get loose  or vibrate? Does this mean the transformer will fail?

 6 
 on: February 03, 2019, 07:16:48 AM 
Started by vrod - Last post by vrod
Steve, the noise is coming from the amp, not the speakers.

 7 
 on: January 28, 2019, 10:39:42 PM 
Started by Ed Schilling - Last post by Ed Schilling
I saw this at a manufacturers site tonight. I was astonished. It's there, plain as day!! Why have  I (we) never heard it? Well, you need to be at a very loud level. This what I read....

"One of the tests we use to gauge our audio quality is if we can hear Lindsey Buckingham's f-bomb, whispered almost inaudibly just before the first note on 'The Chain' on the Rumors album. (Betcha didn't know that's been there since the '70's!) It's normally only audible through a set of good headphones on a good system turned way up loud."

Am I the only one here who did not know this and is your system good enough? I can easily hear it on a copy made 10 years ago. Have not tried vinyl yet...waiting on IC's...all mine died! WTF?
Ed

 8 
 on: January 27, 2019, 12:16:19 PM 
Started by vrod - Last post by Steve F
That’s what I’m wondering Ed. Sometimes transformers need to be tightened up.
steve

 9 
 on: January 26, 2019, 09:39:19 PM 
Started by vrod - Last post by Ed Schilling
Vrod, From your post it seems that it must be mechanical hum from inside the unit if the speakers are silent. That may or may not be hard to "fix". If it is coming from the amp itself and not the speakers then pull the top and listen.......
Ed

 10 
 on: January 26, 2019, 08:14:34 PM 
Started by vrod - Last post by Steve F
Check dc offset

https://m.wikihow.com/Measure-DC-Offset

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