[Apocalypsee]

I want to change the JRC 5532D on my Klipsch preamplifier (GMX A-2.1) with something better. Someone recommend me LM6172, can I replace it with other like LM4562 or LME49720?
Picture of the preamplifier:

Any help would be appreciated

 

[Apocalypsee]

Anyone....?

 

[user5412]

Look up the diagrams for each respective chip. If they have the same pinouts and similar power requirements, it shouldn't be a problem.

 

[Apocalypsee]

Quote:

Originally Posted by user5412 /img/forum/go_quote.gif Look up the diagrams for each respective chip. If they have the same pinouts and similar power requirements, it shouldn't be a problem.

Thanks for the reply, the pinouts are the same (both are dual opamps), the power requirement quite similar too, the 5532D require about 3V to 20V while LME49720/LM4562 is around 2.5V to 17V, I think it should be fine, I think......

Any more comments are welcomed, I'm afraid I might do it wrong

 

[user5412]

Could you try soldering a socket and try both?

 

[Apocalypsee]

Quote:

Originally Posted by user5412 /img/forum/go_quote.gif Could you try soldering a socket and try both?

That's a great idea!

Anyway, I want to ask, I done RMAA test on my SB Live! line out by using my stock Klipsch 3.5mm cable loop back to line in, and this is the result, can anyone translate it, is it any good? Looks like the card resample to 48kHz, since it gets better result than 44kHz....

 

[hardnrg]

I believe the SB 022x is a variation of the EMU10k1 card (I have a SB 0220, SB Live 5.1 Digital (OEM)) and as such, it resamples to 48kHz just like the rest of the Live and Audigy1 series

 

[Apocalypsee]

I've received my LME 49720, but I only have three, there are four JRC 5532D, which one should I replace?

 

[Apocalypsee]

I've junk all top three JRC 5532D and the difference is huge! I can hear fuller sound, more instruments, and each instruments have its own layers and no longer sound muffled and out of shape, more pronounced and no longer overwhelmed by foreground music and voice. Voice is much warmer, the electric guitar high are no longer stinging to my ear. The atmosphere is more airy, the famous hissing noise on this speaker nearly non existence

Test was done with onboard Realtek ALC888 with latest driver not in a silent room! God knows what other improvement I might hear if I change the soundcard, I can't believe the difference I hear

 

[ROBSCIX]

Sure, the JRC5532 is not a particularly good amp and I think the company probably used it to try and save some money. Glad to see you got some great gains.

 

[dfkt]

Sorry to bump this thread - but where could one buy these opamps in small quantities?

I'm really tired of the hiss and hum of the GMX 2.1, especially when turned off and connected to a non-grounded source, like my laptop.

(Another interesting mod would be shielding it, so it doesn't begin to howl when a cellphone is close to it... would that be possible?)

 

[Apocalypsee]

Quote:

Originally Posted by dfkt /img/forum/go_quote.gif Sorry to bump this thread - but where could one buy these opamps in small quantities? I'm really tired of the hiss and hum of the GMX 2.1, especially when turned off and connected to a non-grounded source, like my laptop. (Another interesting mod would be shielding it, so it doesn't begin to howl when a cellphone is close to it... would that be possible?)

I bought it from National Semiconductor, here it is, the part number is LME49720NA click on sample:
http://www.national.com/pf/LM/LME49720.html

The hum is coming from the amplifier on the sub, from what I research the gain in amplifier is high thats why its humming when not listening to anything. I don't know how to eliminate this though

I believe its possible, but I never done it

 

[dfkt]

Thanks a lot, Apocalypsee - this is even cheaper than expected. Nice move of National, giving out free samples.

Already ordered 3...