Help with defects in my VCS and mod questions

[Wooba]

Hello, today I became the brand new owner of a six switch atari 2600 which I got from an auction on ebay. I never owned an atari before, so I have a few questions about mine.

 

When I got the system it was a little unstable, but that was fixed with a little solder to hold the power jack in place. Then I wasn't able to get a stable picture, but a bit of fiddling with the RF modulator and fine tuning the TV the atari is now functional, it however still has a few flaws. First, the sound doesn't really work, all I hear is loud static, I assume that this is due to the fact that my atari is from a PAL A region and my TV is PAL B. The colours are also off I think, combat game 0 is supposed to a beige(I think, I'm a little colourblind) but in my TV it's a puke green and neither of the tanks have any colour. Any help with these issues? I've attached a picture of combat game 0 as it appears on my TV.

 

 

On a slightly different topic, I'm using the aerial lead that came stock with the system, but I'd like to have it output composite. If any of you have ever messed around with a ZX Spectrum there's a very simple composite mod and since both Spectrum and the 2600 use an RF modulator I was wondering if that mod would work on the 2600. Obviously it wouldn't have any sound, but I can always pull that out of some pad in the console if I'm not mistaken. The ZX Spectrum mod consists in disabling the RF modulator power supply and splicing the video input of the modulator and connecting it to a composite cable since the Spectrum RF modulator is converting composite to RF, is this also what's happening on the 2600?

 

 

Thanks for reading all this, I'm a bit of a noob, I know.