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In Reply to: RE: "Buzz" from Preamp? posted by kitjv on September 28, 2014 at 06:49:35
You'd have to do a lot more experiments to understand where the buzz might be coming from.
This could be as simple as dirty tube sockets or sockets with loose pins (a possibility based on your statement that replacing the tubes before solved the problem), or a flaky component in the preamp that needs to be replaced.
One would have to go through the preamp with a scope, meter, and signal generator to figure out where things are going wrong.
Follow Ups:
At this point it seems like I should rule out either the power amp or the preamp as the culprit. If I plug one of the components (e.g. the CD player) directly into the power amp & the buzz goes away, it would seem like the problem is in the preamp. Does that make sense?
If I plug one of the components (e.g. the CD player) directly into the power amp & the buzz goes away, it would seem like the problem is in the preamp. Does that make sense?
Not necessarily..Lets try this..Lets determine whether your preamp is in fact the problem...Plug the preamp back into the amp and turn it on along with the amp..Put the unit on aux and plug in a pair of shielded cables or a single cable and turn the volume down before you do this..Short the end of the cable like this that would plug into your dvd or cd player and turn up the volume and see if the hum disappears..If it doesn't,you have preamp issues most likely a filter cap in the power supply..Is it humming in both channels?
Honest amplification is better than excessive 2nd order distortion anytime.
Michael, let me make sure I am getting this correct. (You have me treading in unfamiliar territory). After turning on the preamp & the power amp,& setting the preamp to "AUX", take a pair of shielded cables (I assume that RCA cables would do?) & plug them into the "AUX" plugs in the preamp. By "shorting the ends of the cables", are you suggesting that I short each of the cables to ground by running a wire between the pin on each cable & ground (e.g. the preamp or power amp enclosure)?
Thanks, Michael.
Kit
Yes
That is what I'm suggesting and it will tell if it;s a filter cap or signal issue with cables.
Honest amplification is better than excessive 2nd order distortion anytime.
Yes.
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