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In Reply to: RE: Thanks a lot ! posted by beppe61 on July 19, 2014 at 02:21:31
I know what you mean. It seems to me the machine assembled boards have a higher heat type solder? I have ruined my share of traces. I use a variable temperature Iron. I have several different width tips. I use both solder wick and a solder sucker. The bigger components can be moved back and forth while heating the solder. That helps break them loose after removing most of the surface solder. All I can say is good luck.
Follow Ups:
" I know what you mean. It seems to me the machine assembled boards have a higher heat type solder? I have ruined my share of traces.
I use a variable temperature Iron. I have several different width tips. I use both solder wick and a solder sucker. The bigger components can be moved back and forth while heating the solder. That helps break them loose after removing most of the surface solder. All I can say is good luck."Hi and thanks a lot again for the kind advice
Sorry if i am petulant but my life has changed ( ehm ... ) really after discovering the eutectic alloy with 2%Ag (i think it is called like this)
This is an extremely easy to solder alloy, even if a little expensive
In comparison the common 60/40 is already a pain at least for meI do not know which kind of alloy they have used for this preamp but i am afraid you are right
For sure it is not flowing like my first choice alloy.
You can solder and desolder it many times and it is always a joy.
I have even the feeling that just add a little of that on old joints can improve them ... it is like a "panacea"
The quality of joints i think it is also important for sound.But this time i am really serious about desoldering
And i also will try braid with a powerful iron
I am very intrigued by restoring old units
I have no enough skills to start from scratch but i have a friend who usually finds in 2nd hand markets old quality pieces, with a really great potential
There are some units from the late '70s (i.e. around 35 years old) of which the service manual is available and that i am sure after a revamping can sound fine.I have mixed feeling with this Electro here
I very much like better simpler circuits ... and this is not simple at all there are dozens of transistors
Let's say that is a try
Maybe new caps can lower the noise and impedance in power supply lines
I have also bought 100 UF5408 fast diodes
There are 12 1N4007 that can be replaced
I am curious and more than everything it will be an experience
I am also thinking to bypass completely the balance
I hate any form of tone/balance control
I am sure they introduce distortion and lower channels separation (the balance at least)I am attaching a very interesting page i found on Cardas solder, from what i understand a really good one
Thanks a lot again.
Kind regards,
bg
Edits: 07/20/14
EC was an excellent active pre, and it sounds great even for today's standard. It has a silky velvet sound and I enjoy mine a lot. For sure it does not belongs to minimalist design. If anybody wants its schematic I can provide it but only beginning August when back from trips. It's a musical pre like fews, IMHO.
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