I learned more from your video that any of the DC offset content on KZread that I've watched so far. Great tip!

Thank you demonstrating simple old school electronic technique/diagnosis.

Just checked mine and had 17mV on the right and 10mV on the left so made a quick adjustment. I have read that anything under 25 is supposed to be considered very good but may as well have as close to zero as possible.

Simple yet very effective.

Informative video, thank you.

Cool Tip my friend 👍🏼

Thanks!

Great tip, love your videos just about to embark on a full recap of a Marantz 2235B, I also have a 2250 and a Sansui 9090 to do as well. Suttle but important details you bring up in your videos are crucial for doing this hobby. Thank you and keep them coming.

@CM-dw3gh

3 жыл бұрын

How did the recap go Pierre?

@pierrekitts7089

3 жыл бұрын

@@CM-dw3gh have not found any time yet to complete the recap.

@CM-dw3gh

3 жыл бұрын

@@pierrekitts7089 I hear you. I've the same plans but time is never on my side either

Thank you!

So cool.

thank you

Very useful tip, but what is it that you change-regulate with the screwdriver? Also what will happen and why, if you touch the chassis with the white (+) speaker wire, as someone below suggested NOT to ever do?

@mat.b.

9 ай бұрын

he turns the voltage regulator with the screwdriver

May I ask some question,what happen if we measure bias voltage and dc offset with the interconnect cable on and with speaker cable hooked?

Hi I have a 7.2ch av reciever and i just checked the dc offset I got the following results Pls tell me if any of the channel needs to be repaired Dc offset Front right -0.5 mv Front left -0.2 Center -5mv Surround Right -35.7 Surround left 5.1mv Height right -29mv Height left -12mv

That's a great trick, thanks. Where do you set the volume at when measuring dc offset?

@AHFixIt

5 ай бұрын

0

@belabertalan

5 ай бұрын

@@AHFixIt Thanks 👍

so just to make sure, you have negative connected and you brush positive on the terminal, and if the speaker makes static then theres a DC issue?

@AHFixIt

2 жыл бұрын

Polarity doesn't matter but yeah, you got it. Always best to check with a multimeter though.

Curious where you source your components from? Do you usually install new pots?

@AHFixIt

2 жыл бұрын

I get everything from Mouser and Digikey. Trimmer pots some are known to be troublesome and I'll replace those, but most of the time they're fine and can be cleaned with deoxit f5

The static noise on the right channel messured 0.60 but fluctuating, - the noise free left channel 0.08 and stable, - any suggestions ?

@AHFixIt

2 жыл бұрын

I'd consult the service manual for your unit and see if there is an adjustment for DC offset, and adjust it accordingly.

Well done. I guess my only Q would be - How did the DC offset become so out of adjustment in the first place.?

@mat.b.

9 ай бұрын

he manually changed it for the example

@carlrudd1858

9 ай бұрын

haha, well, there is that. Thanks@@mat.b.

Hi, just want to get your personal opinion inline with voltage biasing. Is it possible to properly adjust bias voltage using an ordinary digital multimeter. Thanks...

@AHFixIt

2 жыл бұрын

Yes! I do it here: kzread.info/dash/bejne/f5Ojyrp-e6zdh5s.html

@embermanalo7496

2 жыл бұрын

@@AHFixIt Thank you for your prompt response inline with my query. Now I am confident to using it after I finish restoring my Sansui A-7 amplifier. Is it ok to ask more question in the future?...

@AHFixIt

2 жыл бұрын

Of course, I try to answer as many questions as I can. Be careful with sansui, they will give the bias in mA and you need to look at the schematic and convert it to volts with ohm's law. I can't provide much detail beyond that, unfortunately

@embermanalo7496

2 жыл бұрын

@@AHFixIt Thanks for the advice, I really appreciate it. No worries I had the schematic diagram and you're right, that the bias voltage is in mV...

Nice. I have a question for you do you sell any of you're stereo receivers ?

I've been googeling for a while but couldn't find it: If we look at the back of a Marantz 2225, the following speaker output is connected to the white adjustment knob: Speakers main: R+ (left top) = R712 L+ (right top) = R711 Does anyone know to which speaker output R733 and R734 are connected to?

@johnroady9495

2 жыл бұрын

ps. I have pressed the 'Remote Speaker' function, but I don;'t hear any crackling when I turn the R733 and R734 knobs

I'm not sure if a multimeter is the right tool to measure DC offset. You are measuring volts rms. Only with an oscilloscope you can see the full waveform and confirm it is fully symmetrical which means the positive peak matches the magnitude of the negative peak. In this case the wave center is on 0 volts which is not the same as 0 v rms measured by the multimeter. Knowing peak to peak or rms voltages tell us nothing about the symmetricality of the waveform. Nice video by the way.

@v12alpine

2 жыл бұрын

DC Multimeter is the correct tool. He's not talking about an AC waveform offset. It's the idle DC offset.

Touch the white wire to the output case and see what happens.....

@AHFixIt

3 жыл бұрын

🤣🤣

@pauldow1648

2 жыл бұрын

Could you answer your question.please.

@JasonMontell2501

2 жыл бұрын

@@pauldow1648 I think it releases the magic smoke