Question about KLH Vintage Model 20 Turntable & Receiver

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Klh model 20 no volume

Low volume, distorted sound, right chanel output transistors hot

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What kind of speakers do you have hooked up? make sure your cables from the speakers are good. you should have an RCA type hookup on your record player, make sure they are in there good too

Posted on Mar 09, 2014

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1 Answer

At low volume it is fine after you get to about 20 on the volume it starts to crack,pop and distort very bad what is making this happen


Your speakers may say 350 watts but that is the peak wattage at which they blow up and not a wattage they can sound distortion free at. Look for the RMS wattage which is probably around 40 watts. If you look at the specs on your receiver you will see it will put out a maximum of about 50 watts but the distortion on the receiver is above 1 percent at anything over 22 watts. That means they are going to start distorting at around half volume. The other thing you might check for is a impedance mismatch between the speakers and the receiver. Is the receiver set up for an impedence output of 8 ohms but your speakers are 4 ohms impedance.

Aug 23, 2015 | Kenwood KDC248U CD Car Stereo Receiver...

1 Answer

How to install KLH asw10-20 to a 7.2 receiver


Yes, the 10-120 can use a L & R low level subwoofer input. You can get a short 6" RCA splitter adapter from Radio Shack for a under $10. (1 female input, 2 male outputs) Alternately, just plug the subwoofer output on your receiver to just the low level R channel on the KLH sub.

Jan 20, 2015 | KLH Audio Players & Recorders

1 Answer

One side dead


hi zm_16dec,

Right chanel fully dead , output transistor burnedout ,

Without knowing the make and model of your amplifier

all i can advise is to replace the unknown part number of

the transistor.


Look for the working left channel output transistors and

replace the bad transistors in "pair". These may include

other components but check on it as well.


Check the speaker system, especially where that channel

is connected.Inspect speaker wires or cable up to the speaker

itself.


Amplifier wont blow without reason.It could be from the wirings,

speaker or volume settings of the unit.

Thanks for choosing Fixya for assistance!

Dec 24, 2012 | Audio Players & Recorders

1 Answer

I have a behringer 2500. both channels are distorted but not out. what would need to be replaced.


It seems to me that you have a bad transistor, T14 or T13 to be precise. T14 most certainly is in short circuit or its companion T13 (T14 is a small signal NPN transistor whereas T13 is a small signal PNP transistor). I just fixed one with the same symptoms as yours. You should be able to measure T14 collector voltage against ground (metal chassis) and the reading must be very close to +15VDC. Also, measure T14 emitter voltage to ground and the reading must be very close to -15VDC. If any of those voltages is compromised, you will not be powering the amplifier's operational amplifiers (U4, U5, U6) right. Check T14 and T13 with your multimeter and replace them as needed. Also, keep in mind that after replacing any of those transistors you will be required to readjust the BIAS current for your amplifier's drivers, which by the way, is a very easy task to accomplish. You know your BIAS current is misadjusted when your output transistors get really hot even under no signal conditions or when your amplifier distorts at very low volume levels or on high frequencies amplifying. To adjust the BIAS current for channel 1's driver transistors, wait until the amplifier has cooled down, locate and adjust VR3 until you read 80 mV across R2. To adjust BIAS current for channel 2's driver transistors, locate VR6 and adjust it until you read 80mV across R106. You need to wait until the amplifier cools down to set BIAS current right, If the output transistors' heat sinks get hot before reaching proper BIAS current adjustments, wait until they cool down to average room temperature and retake BIAS current adjustment. Once both channels BIAS currents have been readjusted, apply a thin coat of thick nail polish to the sides of VR3 and VR6 to keep vibration from misadjusting BIAS currents again... T14 goes down under severe BIAS currents shifting and it just makes me wonder as to why BEHRINGER does not apply a setting substance to VR3 and VR6 so they do not shift under sever vibration conditions, after all, almost any major amplifier manufacturer in the world does it. Good luck!

Nov 10, 2012 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

AM 35 Amplifier problem Dear Fixya I ma using two technics turntables into Vestax PMC 25 powered by Akai AM 35 amp. The amp Balance switch between left and right is not working. Also the amp...


From your description, I would guess that the output stage of the amp is not working properly. Rather than the outputs being shorted (the most common failure), the output transistors appear to be open. This basically means that you are attempting to drive the speakers with a "pre-amp" section. This could be a power supply problem or defective transistors. An examination of the last stage of the amp is needed here. If the outputs are open, the parts cost will be in the $40-$60 range. Power supply repairs will likely be in the $20-$40 range for parts.

Hope this helps a bit.

Dan

Aug 20, 2011 | Audio Players & Recorders

1 Answer

My fender hot rod deluxe is distorting in clean channel when I push the volume past 2


Realize that the number on the volume control is only relative... it means nothing regarding what the amp can produce. With a high level output guitar you can easily drive the amp into distortion at very low volume control level settings... what counts is the actual output sound volume and specifically the voltage output going to the speaker. Once the amp reaches saturation, any further input just pushes it into distortion or "flat topping".
An oscilloscope on the output will quickly show when amp starts to flat top.

Jan 17, 2011 | Fender Hot Rod Deluxe Guitar Combo...

2 Answers

Right speaker is distorted with low volume, left side is fine. Swapped speakers no difference (ie it isn't a speaker problem). Using the balance knob, full left sounds fine, full right is very distorted...


Possibly one of the power transisitors has gone out. They are typically used in pairs, and if one went out, this is likely what you would experience.

Open the unit and look for the power transistors. The have 3 leads and should be connected directly to a heat sync. If one burnt out, it will likely be obvious by just looking at it. Power transistors are cheap (>$10) and there are many online sources to by them from. With a litle soldering skill, shouldn't be too bad.

Mar 26, 2010 | Sony STR-DE705 Receiver

1 Answer

Vr-309 starts to clip after 10-15 min


This is a case of one or more transistors breaking down when heated. This can be found usually by using freeze spray to cool down one transistor at a time until the problem clears up. You can narrow this down a bit by determining whether this "noise" is effecgted by the volume control or not. Also, does the problem show up faster when the unit plays louder?

Dan

Aug 29, 2008 | Kenwood VR-309

3 Answers

1974 FENDER TWIN REVERB HAS NRE TUBES NEW FILTER CAPS AND WAS REPAIRED BY RETIRED AUTHORIZED FENDER TECH. PROBLEM AMP HAS VETY LOW OUTPUT UNTIL YOU CRANK IT TO 8-10 THEN IT SOUNDS HORRIBLE DISTORTED AND...


This sounds like a power supply problem. The high voltage for the tubes is not right. Either you are missing an amplification stage because this or one of the coupling caps is faulty. I'd have to see the unit itself to give you any more details.

Dan

Jul 22, 2008 | Audio Players & Recorders

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