Question about Krell Showcase 5 5-Channel Amplifier

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Amp schematic diagram channel

When open humming noise and crackle

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Iwant the schematic manual for krell showcase 5 ... tank you ...

Posted on Mar 21, 2018

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Posted on Jan 02, 2017

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1 Answer

Why i can hear faint sound on my mixing amplifier


Depends on what sound it is. If it's a hum, then it could be a fault. If the hum is on one channel then the place to look is that channel. You can compare the good channel with the bad one for clues as to what.
If it is in both channels then you are looking at the power supply. Or something common to both channels.
Hum is most often caused by Electrolytic Capacitors.
Crackling noises are caused by resistors, or transistors, or IC's.

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I have a huge Buzzzz with my Peavey Model 115BW Session 500, no matter what I do, buzz buzz buzz, I have taken it apart to get to the main caps, found neg 50vdc on one main and found neg15vdc on the other,...


Hum or buzz is often caused by the mains filter capacitor letting the 50hz mains hum into the system. Regardless of voltages you just need to try new capacitors. If that doesn't cure it, the problem is elsewhere. If it's a stereo amp and the buzz is on both channels then it's something common to both channels.

Sep 14, 2013 | Audio Players & Recorders

1 Answer

Crackling & popping noise from one channel


Your best way to deal with this issue is to do some "hum tests" inside the unit with it on. Since only one channel is faulty and they are identical, you can use the good channel as comparrison with the bad. You simply touch with you a plastic tool or if you can your finger - not touching metal parts though - and either channel will buzz. Chances are you will come upon the faulty part and make it crackle.

Feb 26, 2013 | Audio Players & Recorders

1 Answer

Fender Hot Rod Deluxe. Works great except when I turn the amp off it crackles pretty loud. It takes about 5-10 seconds for the crackle is heard. If I turn the standby switch first, then wait a minute or...


As voltages drop, electronics gets unstable as it goes down and becomes noisy... this may be the nature of this beast. Opening the standby might be the best way to avoid the problem.. Here is your schematic for service:

http://elektrotanya.com/fender_hot-rod-deluxe_sch.pdf/download.html

Scroll down to "get manual" and click to download. IGNORE other download links.
Opening the standby switch turns off power to the main amp so noise generated in the preamp will not be amplified.

Jul 25, 2011 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

I have a pair of JM lab Electra 905 speakers, running through a DNM amp and power amps. When powered up, the left speaker makes a very loud humming noise. This has happened recently. I haven't changed...


Hello
Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.

Apr 10, 2011 | Jmlab Electra 905 Speaker

1 Answer

I request a schematic diagram of crown power amp CE2000 2-Channel


The surface mount ic= MC33079D , 14 pin quad low noise op amp is likely at fault, IF the amp is NOT showing a fault light. A LM324D surface mount will
also work in a pinch. It's located on the input pcb attached to the input jacks.

Jan 19, 2010 | Crown CE2000 2-Channel Amplifier

1 Answer

Very loud hummimg and crackling - even when volume turned down.


There are a few variants for this model depending upon the serial number. From your description, there are some capacitors in between the amp stages called coupling caps that are failing. The hum is some DC current being passed through the output stage. The crackling is probably just dirty controls.

Dan

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2 Answers

Humming noise in Harmon Kardon AVR 110


on what cd dvd ? cheak cable 1st rca swap out

Jan 29, 2008 | Audio Players & Recorders

1 Answer

Losing volume on channels


I am afraid not. That crackling is a component in one of the solid state amp circuits starting to fail. These are all soldered into the printed circuit board. This could be a difficult repair to find an intermittant component. Depending on how old the unit is and how much it cost will factor in on if you have it repaired or not. Rule of thumb is that if the unit is two to three years old and cost less the 200 to 300 bucks you should not invest more then 100 to 150 bucks into it. Good Luck

Mar 14, 2007 | Sony STR-DB840 Receiver

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