TESTING C6 BULBS!
Here's an quick and easy way to test those old C6 series light bulbs:
To the Right, is a picture of 3 C bulbs, from left to right:
C6, smallest bulbs, series wired (if one burns out all, they all go out)
C7, standard christmas lighting bulbs (such as your ordinary christmas window candle bulbs)
C9, the large outdoor bulbs ( used in outdoor strings, popular in the 50's and 60's)
Don't be fooled by the color of the bases on these bulbs. The gold or silver bases help to identify the age of the bulb, but not the size of the bulb.
When you test these bulbs, simply rest the screw in part of the base against one of the battery terminals, and the pointy end on the other battery terminal. Use a square 9 volt battery. See pictures below. Don't be afraid to wiggle, and press firmly, so as to make a good connection. If the bulb is good, it will light. This is the best way to find that burned out bulb in your string. Sometimes corrosion from age can prevent a good contact.
Generally C-6 lighting came in 8 or 9 bulb strings. If one bulb is burned out, your set will not light. Use the battery test to find that bad bulb, and make your repair easier. Don't ever throw out your burned out bubble lights, matchless stars, or plastic stars. They can ALL be relamped.
If you want to get the most life out of your vintage C-6 lighting, have a qualified person build an electrical box with a dimmer switch and an outlet, or contact Paul to build one) You can plug your sets into this box, and slowly bring the bulbs up to the brightness you desire. Think of it as a "controllable surge suppressor". Light bulbs get "spiked" when you first plug them in. 110 volts charge through the tiny filament. This dimmer switch will make your sets last significantly longer. If you have any questions, please feel free to contact us, we can manufacture these boxes for you.
Only the C6 bulbs can be tested this way, using a 9 Volt battery. Occasionally, you may run across C-6 based bulbs, that were used in "farm sets" or battery operated sets. They are quite uncommon, and should not be tested in this manner. The operated on very low voltage, and the battery will burn them out instantly. They can be easier to identify by the pointy glass exhaust tip at the top of the round bulb. Often in transparent colored glass.