Question about Yamaha AX-396 Amplifier

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Pathos One MK II Integrated amp.

Hello.
The amp works but I ear about ten times more the humming of the 60 HZ on the left compare with the right channel, it also has difficulties with the high pitch sounds like female voices in classical music or instruments like the flute. It's not the speakers or the source. The high frequencies lose clarity and become annoying to the ear. A technicien told me that it would be very difficult to localise the cause of the problem.

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If you swap which terminal each speak is plugged into, does the problem move to the other side?

I wonder if there is a power cable that runs very close to your speaker wires? You can get hum crossing over that way.

Posted on Mar 11, 2008

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A good hifi tech would note... I am in /Australia and could take care of the problem. Or rate me "FixYa"and get back to me here and i will take you through a diagnostic process

Posted on Feb 09, 2008

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1 Answer

Hello, can anybody help? I have a Marantz PM-47 Amplifier. I think i have a problem with the right stereo output. I have change all the wires over, and eliminated any speaker and wiring problems, it seems...


You don't actually say what's happening!
So the only advice I can give is that in stereo amps the two channels are the same. So if you are testing it you can compare the left channel with the faulty right. So a voltage reading on the left should match in the same place on the right. You can also touch the amp with an insulated tool. While switched on it will buzz on the channel in question. So if it buzzers on the left then it should buzz on the right. Touching parts of the amp in this way will quickly tell you what works and what doesn't.

Mar 07, 2014 | Amplifiers & Preamps

1 Answer

My Denon PMA-900V integrated amp has distortion in the left channel. When it is cold it is very minor, as it heats up and is played at louder volume the distortion is much worse.


The good news is that it's in one channel, which means you have the right channel parts to compare it with. Now the bad news whatever causing it and it's likely to be a semi-conductor (transistor or IC) has to be replaced. However finding it is easier than you might think. For a start it's going to be hot to touch. And you can get get it to stop being hot, while the amps on, so correcting the fault, for a while. You do this by spraying it with Servisol Super Freezer spray. You have to have the amp running for this. Find the left channel amp and wait while it goes bad. Then spray (one at a time) any part you suspect. If the sound returns to normal, you have found the faulty part! To prove it spray the same in the right channel. That shouldn't change.
You can get the freezer spray from your local electric parts shop (such as Maplin UK).

Jan 13, 2011 | Denon PMA-100M Amplifier

1 Answer

My 8000s has developed a hum which is audible in both speakers. When the amp is first switched on I do not hear it but after about an hours use it becomes apparent. The volume of the hum is constant and...


My first thoughts are to replace the large electrolytic capacitor(s) their will be at least two I think, as they could be getting leaky. Though they could be fully charged up on switch on (hence no noise) they could lose it as time passes and let the 50/60 Hz mains hum in (which they stop). Another cause could be a semi-conductor that has become heat sensitive. This again could be in the power supply or something that has both channels running in and out of it. This is because the noise is in both channels, so can't be something that deals with only one channel, even if there are two of them!
Replace the caps first, if that doesn't solve your problem, then get some Servisol Freezer spray and spray any suspect part (one at a time) when it acts up! If the noise goes you have the culprit.

May 20, 2010 | NAD C372 Amplifier

1 Answer

Nad c270 power amp transfomer hum


if the hum is in the sound output you have a blown power regulator

Mar 31, 2010 | NAD C270 2-Channel Amplifier

2 Answers

I have a low hum with my Carver M 400 amp. How do


If it is accros both channels (on every imput) your best bet is to replace the large electrolytic capacitors in the power supply, these filter out the 50/60 Hz hum from the mains, so they might have failed. Electrolytic capacitors anywhere are good at causing hum!
If they are say 4700UF at 50Volts, you can replace them with any UF rating higher than that, and the same with the voltage. Never go lower than the ratings marked. Also keep an eye out for the temperature rating. It will be given marked "c". If it says 105C then replace with one the same, though it will work with a lower rating it will fail faster than normal. The only problem with electrolytic capacitors is 'space' to fit as they come in many different sizes. So bare that in mind when you a tracking down replacements.

Mar 22, 2010 | Amplifiers & Preamps

1 Answer

The left channel is damaged.


Have you replaced the semiconductors for the left channel on the heatsink. These are the main culprits for speaker damage.

Jan 31, 2010 | Amplifiers & Preamps

1 Answer

Technics Integrated amplifier su-v85a speaker volume fluxuates and speaker left shuts down some times what is the problem?


test you speaker maybe there is a bad connection some where is the spk. box its self ,try changing speakers left to right .
it the spk. are ok open amp see all the connections within the amp .
if this dose not work contact me by mail: starilaz@net.hr

Oct 12, 2009 | Technics SUV500 2-Channel Amplifier

1 Answer

Marshall AS50R produces a loud hum with an intermittant loud click, even when nothing is connected. This happened after use with zoom g2


Sounds like a power supply filter cap has gone bad.

The hum you're hearing could be the 60 Hz AC, especially if it is a low frequency.

If that IS what it is, the Zoom G2 was just a coincidence.

Aug 07, 2009 | Amplifiers & Preamps

1 Answer

Vintage Stereo Connection ???


Hi spanky

Where to start :) I am excited thinking about them :p You got 2 totally cool pieces of classic vintage gear there in the C2 and the Marantz. I have a C2 preamp myself (gathering dust but wont sell it cos its excellent) and the marantz would be totally cool to have(but then I am a little biased towards 70's vintage marantz). They ruled the roost in HiFi amps throughout that decade.

Because they are both integrated amps, you could use them as standalone systems with a pair of speakers, and just plug your favourite gear into them. If you just wanted to run up a nice sounding HiFi, I would sell the kenwood gear and just keep the Marantz. The Kenwood kr1100 has the edge in power, so if it is grunt you are looking for use that. Because vintage sound is all about stereo, you only really need an integrated amp to get great results.

the specs are
# Kenwood Model Eleven G (KR-11000G) Receiver
120W per channel min RMS, both channels driven, at 8 ohms from 20 to 20.000 Hz with no more than 0.03% total harmonic distortion.
Dynamic power output 440W at 4 ohms
Power bandwidth 5 Hz to 70.000 HZ
Frequency response 5 Hz to 100.000 HZ -1.5dB
Signal to noise ratio 115dB

The marantz is a little lower in power at 75rms a channel, but will have the sonic edge in vintage sound over the kr1100. Look them up on ebay and you will find that they do have some value to collectors and people seeking nice tone. There is an 1152 for sale here for AU$900

Best bet is to fire up the 2 integrated amps,and see how they are going. Run them for several hours to be sure there is no strange noises and crackles. Then decide if you want power or finesse.

You could also run both amps from the C2 preamp by connecting to the Amp in connections to the rear of the integrated amps.

happy to talk to you more about it, hit me with a Fixya if my advice was helpful to you. I would keep the marantz, use that and sell the rest and buy some nice speakers:)

regards
robotek

Jul 20, 2008 | Amplifiers & Preamps

2 Answers

Fan


The hum is power line hum ( 60 cycle ) . It may be that when the amp gets warm that something in the case wants to vibrate to the 60 cycle hum.

I have amps that hum like that and theyre fine.

Depending on the design of the amp, the cooling fan may not go on till it gets really warm in the amp. Some run all the time like the Ashly I just fixed

Dec 03, 2007 | Crown CE2000 2-Channel Amplifier

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