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I am doing some econometrics work aiming to build a good regression model and I was wondering is it possible to have a Lin-Log regression were only SOME of the explanitory variables are logs and the dependant variable is linear

For example PRICES regressed against LOGquality LOGsize weight value (just a made up example)

Yes it is possible but interpretation of coeffs might differ than what you'd expect. Say you have a model of y=0.5 log_x + e. What this means is that 1 unit increase of y explains 0.5% increase of x. But I might be wrong. Check J Woolridge (2002)

Ok I shall have a look. Thanks for the reply!!