|13th February 2004, 12:49 AM||#14|
Re: Re: JLH 10 Watt class A amplifier
My last JLH-amp (the updated 2003-ESL version) is dead quiet in my home setup.
It's noisy when unconnected cables are present.
However, when several weeks ago I hooked both amps to my son's dual-cd-mixing console (setup for a big party). I HAD A MAYOR hum on one channel when connecting one or two amps to my son's device.
I cured the problem with a simple box which was just a resistor based voltage divider on both channels. Which was needed any way to prevent speaker damage as the output of this console exceeded the sensitivty of my J-Amp.
Two weeks after that I had a similar hum at a test-setup to get some metrics done on my amp.
So, probably, I've might have mixed the wiring of the toroids on both channels. (both main wires are yellow)
I don't mind the noisy part with not connected cables. I'ts not interfering with listning to music (which needs connect cables)
|13th February 2004, 07:27 AM||#17|
Join Date: Oct 2003
btw this is how my amps
Hi Dutch Diy,
Yours is Good Too.
The difference is that your amp is 'SEE THOUGH'.
I try to build it in one case. It is just enough space.
Finally, I add two pairs of cooling fan at the rear side.
I also need to adjust the fan speed to mininize the noise.
Now, the noise of the fan is hearing at about 1 feet. (It's acceptable).
I run the amp with about 12 hrs. The heatsink is kept at about 30 - 40 deg C.
I also test with signal generator from 50Hz to 22000Hz sine wave.
From the oscillograph, there is no visible distortion. I did not have another meter to test.
Enjoy with the music !
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