Back in the 80's I used the blue regulator that was recommended by Direct Connection, for use with their electronic ignition system. I am guessing this is the same part. It worked fine for many years. I can see why constant voltage could be bad but I am a little confused on this topic. Looks like many of us are. The simple solution is to buy the transistorized regulator sold right here. I bought one for my latest project and can't say myself on it's graces but it's been for sale here for awhile and nothing but good response. Price is right too. Also looks stock and plugs right in where the old one came out. Just saying.