[Mad Max]

Doesn't 60/40 solder tarnish as well anyway?  I assume older electronics use 60/40 or something, and they always have tarnished joints by now.
And about removing tarnish: http://www.robotroom.com/PCBTarnishEraser.html 

 
Anyway, Cardas Quad melts so dang easily, followed closely by WBT silver and Ratshack silver solders.  Even a couple years later, the joints they made still melt again pretty easily, so they are fine choices that can help you keep the temperature that you work with to a minimum.

 

[BrianDonegan]

 

Doesn't 60/40 solder tarnish as well anyway?  I assume older electronics use 60/40 or something, and they always have tarnished joints by now.

 
No. Tin/Lead does not tarnish.
 
Degradation of old solder joints is typically caused by the acidic flux left on the board (not properly cleaned off in most electronics due to cost).  

 

[ecohifi]

 
Quote:

 
 
No. Tin/Lead does not tarnish.
 
Degradation of old solder joints is typically caused by the acidic flux left on the board (not properly cleaned off in most electronics due to cost).  

Bad solder joints are caused by someone who is a novice at soldering or a process in a bath that didn't go right. 
It is best to stick to the 40/60 normal solder.
Thx BrianDonegan,  had to get a EE mini Max dac plus because I could get on to your site fast enough to order your gear.  I can only get 3G slow internet- sorry!

 
 

 

[maxietheboss]

I am going to buy a Matrix M-Stage in the future and the opamp rolling sounds interesting to me. So far I have seen that the OPA627AP Class A biassed is a popular opamp for the M-Stage. Tamaudio sells these mounted and biased but I have heard that they use fake opamps, can anyone of you tell me if this true, considering the cost ($30 for 2 OPA627AP, adapter and biased) it might be true. How difficult would it be for an absolute beginner to apply a Class A bias to an adapter with 2 OPA627 opamps?

 

[Mad Max]

Not hard if you can solder.  After all, recommended resistor values for biasing OPA627 are posted somewhere in the M-Stage thread. 

 

[Tommy Thong]

do anyone compare ada4627-1 n lme49990?how's the sound quality, sound stage, hi-lows?

 

[G.Trenchev]

I've upgraded my amp with OPA1612 today(coming from LM4562).
Even better details,better treble(LM4562 was rather hot-trebled),better bas definition and a tad warmth(it's welcome).Made sound just perfect.

 

[SpudHarris]

Quote:

do anyone compare ada4627-1 n lme49990?how's the sound quality, sound stage, hi-lows?

Well, I spent a lot of time with the 4627 and 4637 (my favourite opamp for a while) in various amps and have to say they are very, very good. The LME49990 to my ears is much better in almost every amp I tried it in, I have rolled them into all of my portables and have had them in my EF-5 for a while also.
 
 Sound quality is amazing, almost tube like details/micro details. What I mean is there are details but never, ever harsh, brittle, bright or metalic which is how I found the 49710 over time. LME49990 is my favourite opamp at present I bought 7-8 dual modules from a trusted e-bay source in the US, I can let you have the details if you wish....

 

[Tommy Thong]

 
 
to SpudHarris, I totally agreed with you about these two opamp, even i tried Burmester2 CD to test both of them,
these are my little collection

 

[Tommy Thong]

to G Trenchev: "I've upgraded my amp with OPA1612 today(coming from LM4562).
Even better details,better treble(LM4562 was rather hot-trebled),better bas definition and a tad warmth(it's welcome).Made sound just perfect"
 
My suggestion: you need to try the LME49990, My friend

 

[Tribbs]

Quote:

 
My suggestion: you need to try the LME49990, My friend

You have my interest peaked.  I ordered a pair.
 

 

[Tommy Thong]

where is this lme49990 gonna try on?soundcard or cdplayer or preamp?

 

[qusp]

aha, so Nigel finally feels some of the lme49990 love
 
best single evaaar!

 

[Tommy Thong]

so far, i tried to compare lme49990, lme 49860, ada4627-1, opa827 n opa1641 on my denon cdplayer, still, i feel lme49990 is the best suit opamp ic
 

 

[SpudHarris]

Yes buddy, been swapping them ito everything I own haha. They are unreal!! That said I fancied a change with the Fi-Q last night and dropped the ADA4637B's back in, they are class also.
 
Been speaking with Ryuzoh of late about the Fi-Q and cans like LCD-2 and HE-6. Switch 1 on / Switch 2 off and with the LMW49990 have both J1/J2 switched on, it's scary to think a little amp like the Fi-Q (well little compared to some home amps) can sound so good with such hard to drive cans.....