Go Back   Home > Forums > >

Solid State Talk all about solid state amplification.

Harman Kardon AVR355 makes hiss noise in speakers
Harman Kardon AVR355 makes hiss noise in speakers
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old 5th January 2016, 08:03 PM   #1
Zaronn is offline Zaronn
diyAudio Member
 
Join Date: Jan 2016
Default Harman Kardon AVR355 makes hiss noise in speakers

I have a Harman Kardon AVR 355 where it has started to produce a lot of buzzing sound/hiss. Especially in front speakers. Worse is the right front. There may also slightly crackling sound. Have tried to change the wiring of the speakers (left and right), and then the hiss move with it. Hiss comes regardless of the volume or the input used. Otherwise the receiver works just fine, it's just that there's been a lot of noise in it.

So, what's the most likely reason? Bad capacitors? Transistors? I've been looking inside of it, and there are no visible bad capacitors, but they could certainly be dry for that manner. What I am unsure of is what capacitors may be the cause. Are we talking about the big power capacitors? The large in the rear next to the speaker outputs? Or it may be any others that can also cause such noise?
I have a lot of soldering experience, but not very much technical amplifier experience. So I need some help here.
Someone who can recommend good quality capacitors for audio? I was thinking of Panasonic TSHA, but their hard to get (discontinued?). What could replace them? Since I have to fix the reciever im thinking of upgradring it at the same time with better capacitors (and eventually transistors if needed).
I also wonder what and how to empty the amplifier power before doing any work on it. Enough with a bulb of 220V/60W for example?

Last edited by Zaronn; 5th January 2016 at 11:54 PM. Reason: Correction
  Reply With Quote
Old 15th January 2016, 12:11 PM   #2
Zaronn is offline Zaronn
diyAudio Member
 
Join Date: Jan 2016
No one?
  Reply With Quote
Old 15th January 2016, 06:41 PM   #3
djoffe is offline djoffe  United States
diyAudio Member
 
Join Date: Oct 2008
Default Odds are...

If the issue is hiss...

it could be a bypass cap with dramatically reduced value across a zener diode, as the zeners are always, by nature, quite noisy.

it could be a noisy resistor somewhere toward the front of the amplifier, very likely in the emitter of a gain stage.

it could be a noisy transistor

If the issue is hum...

then likely a big filter cap in the power supply.

but from here, it's just guesses
  Reply to this post

Reply


Harman Kardon AVR355 makes hiss noise in speakersHide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Harman Kardon HK6600 - hum and pops in the speakers on powering NikolicaD Solid State 3 15th May 2020 09:23 PM
Harman/Kardon 430 - Need help with strange powerup noise sputnikvt Solid State 10 10th April 2014 06:09 AM
Connecting Harman Kardon 2.1 Analog Speakers to LG LED HDTV with Digital out AnDom Parts 1 6th August 2012 09:04 PM
Harman Kardon Receiver Question - DC output to Speakers? hershann Solid State 3 19th February 2008 06:12 PM
For Sale Harman Kardon T60 Turntable / Harman Kardon Cd491 Cassette Deck electric blue Swap Meet 1 25th August 2006 11:36 PM


New To Site? Need Help?

All times are GMT. The time now is 01:54 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki