[ninjikiran]

Quote:

interesting findings!
 
I am just curious. If one is enjoying the sound that high DC offset is supposed to threaten, why would one need to worry about the DC offset anyway?

Its supposed to threaten headphones by slowly burning the thin delicate components inside of the driver.

 

[uelover]

hahah let's see if etteoh's headphone is still surviving after a year =D

 

[ninjikiran]

If that chip has the same offset as the previous sample.... yea trouble abode

  He probably should of gone with the LM4562 metal can.
 
I doubt a DC offset will damage an amp though if I use it on the RCA outputs.
Quote:

hahah let's see if etteoh's headphone is still surviving after a year =D

 

[middachten]

Quote:

I doubt a DC offset will damage an amp though if I use it on the RCA outputs.

It won't. The D1 uses a coupling capacitor at the output. And most power amps have one at the input. The word coupling capacitor should in fact be 'AC coupling capacitor'. In other words: it blocks DC.

 

[uelover]

I am using my D1 purely as a DAC only. Have recently switched back to OPA627 from LT1364 for my DAC opamp as I find that LT1364 just sound too thin when it reaches my speaker. Interested to hear more about how the other opamp will perform on the RCA output.

 

[etteoh]

Fingers crossed that it will...else we all know where my bonus will go to next year ~ a new Grado

Sorry, just love what the LME49720HA do to my music to bother with DC offset too much. Up till now, I enjoyed virtually all the different albums I played. I can still fault nothing so there you go...would rather live with buying a new Grado than not being satisfied with the music

 
 
Quote:

hahah let's see if etteoh's headphone is still surviving after a year =D

 

[etteoh]

Er...LME49720HA metal can? But hey, don't take my word for it

 
 
Quote:

I am using my D1 purely as a DAC only. Have recently switched back to OPA627 from LT1364 for my DAC opamp as I find that LT1364 just sound too thin when it reaches my speaker. Interested to hear more about how the other opamp will perform on the RCA output.

 

[etteoh]

Unless the LM4562 metal can gives me the exact same sound as the LME49720HA, I don't think I'm gonna roll anything else in there

 
Frankly I don't even know where to start looking for the LM4562 metal can...the guy that I got the LME49720HA from doesn't have it. I suppose I could probably whisk it off eBay but shipping's gonna be a bitch considering where I'm at.
 
Quote:

If that chip has the same offset as the previous sample.... yea trouble abode

  He probably should of gone with the LM4562 metal can.
 
I doubt a DC offset will damage an amp though if I use it on the RCA outputs.

 

[etteoh]

Do it! Do it!

 
Quote:

I have been thinking of putting a metal can 49720(TO-99) into the dac output, I have a biased 49720 dip package thats biased in my amp.

 

[etteoh]

Cool! I tried the suggested approach and all I got was a faint plop so I'm guessing the DC offset is low

Can I do the YAY! thing now? I suppose nothing beats the accuracy of the multimeter but what the hell, I'm just gonna go ahead and YAY! first

 
Quote:

Good to read that you enjoy the LME49720 so much!
 
The only way to actually measure the DC voltage is by using a multi-meter. The ones you can buy at sub $10 price levels are usually not the most accurate ones, but accurate enough for this measurement. Something like this: http://www2.conrad.nl/goto.php?artikel=122999 would be perfectly ok.You can often buy them at Home DIY shops and car equipment shops.
 
Another way you could test this is by inserting the headphone plug into the D1 with an unused input selected. If there is DC on the output you will hear a noise when you 'click' into the first contact. The sound can vary from a clear click (=high DC, potentially dangerous for your headphone) to a vague noisy plop (=low DC, probably harmless). This approach is not very scientific, but it might put your mind at ease (or not

) 

 

[ninjikiran]

 buy it from digikey should sound 100% the same
 
LM4562HA is the model.  And stop spamming

Quote:

Unless the LM4562 metal can gives me the exact same sound as the LME49720HA, I don't think I'm gonna roll anything else in there

 
Frankly I don't even know where to start looking for the LM4562 metal can...the guy that I got the LME49720HA from doesn't have it. I suppose I could probably whisk it off eBay but shipping's gonna be a bitch considering where I'm at.
 

 

 

[flexium]

Question:
 
 
Do the tube preamp output enough power to drive bookshelf speakers(75watt, 8ohm)?

 

[millerlitescott]

No.
 
You will need an amplifier.
 
Scott

 

[etteoh]

MillerliteScott is right. Unless those are powered speakers, you're going to need an amp to drive them.
 
Quote:

Question:
 
 
Do the tube preamp output enough power to drive bookshelf speakers(75watt, 8ohm)?

 

[etteoh]

Thanks dude! I'll try Digikey...
 
Sorry about the spam...it was unintentional

I was too moved by the metal can to think straight

 
Quote:

 buy it from digikey should sound 100% the same
 
LM4562HA is the model.  And stop spamming