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solder formula

Posted by elektron (A) on August 18, 2006 at 15:02:24

In Reply to: Re: board connection posted by desert dweller on August 17, 2006 at 13:17:58:

Desert Dweller, hi. You are most welcome. Glad to help/share. Usual solder alloy used to be around 60/40 - 60% tin and 40% lead. You can get others with small % silver. I got away from lead bearing solders a long time ago and never looked back. The solder your tech is using is probably a tin/lead combo with 2% silver. You can get solder without any lead at all with activated rosin core. I have been sourcing from Capp Alloys in Pennsylvania. They make with only virgin metals. This stuff is the nuts! There should be other companies that make similar as the whole of the electronics industry is moving away from lead. I use a 96.5% tin 3.5% silver solder. It must have a rosin core for flux. It works great. And, yes, Pb/Sn solders can crystalize at junctions. It can (over time) do other obnoxious funky stunts anathema to audio. Get the Lead Out should be everyone's motto for electronics. Besides, you won't have to worry about inhaling lead vapors.

Bill T is a prince of a guy. Besides cj themselves he is the go to guy for cj in my book. I happen to like cj preamps. I build/built amps but not preamps (yet). I still have 3 cj preamps. The main one is a cj Prem 14 - which is just super & it is remote controlled. The Prem 14 uses 6GK5 not RU tubes. I have a Prem 10 too in another all horn system. Although not quite as refined as the Prem 14 it is no slouch either.

A pre design like some of Dennis' work at CARY would probably be easier to access. All point to point wiring. Virtually no circuit boards. Some are remote controlled but am not sure how he does it.
The cj Prem 14 uses little sealed switches that bring in or out various Vishay resistors to control gain. This is greatly better than a pot of any kind. The Prem 10 uses fixed resistors on a multi rotary switch. Probably the Best way would be a Transformer Volume Control using different tappings on the secondary to yield different voltages out (volume).

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