Check the listing for details. Drake FS-4 Frequency Synthesizer Light Bulb Replacement **SCARCE**. Condition: New. Listed at 6.95 USD. If you own a Drake FS-4 frequency synthesizer, you will one day discover that one of the 3 bulbs on the unit will burn out. Upon searching for a replacement, you will be confronted with the fact that obtaining this unusual bulb is most difficult as it is unavailable at your local hardware store and from typical online sources. We were faced with this issue and had to turn over a lot of stones to find the bulb for our unit so acquired a few spares to offer here on Ebay as we assumed others may need a replacement or desire to have a spare or two on hand. Please note that the picture of the FS-4 is for reference and is not included in this sale (yes, someone will assume that they could purchase the FS-4 for $3.95 if we don't have this disclaimer).This is a push-in bulb with a flat base. You need to remove the cover of the FS-4 to access the bulbs on the front panel. The individual bulb sockets swing into position so that you can remove the old bulb and insert the new bulb with only minor inconvenience. Once done, you replace the cover of the FS-4 unit.Please use the Ebay shipping calculator to determine your shipping cost. This cost includes proper packing materials for safe delivery and insurance cost against damage or loss.Those buyers living outside the USA are also welcome to purchase from us. We have shipped to 111 countries during the past 23 years on Ebay and we are happy to ship virtually anywhere in the world. You may use the shipping calculator to determine your shipping cost.Please keep in mind that this cost may not include any import, customs, or VAT fees. If you are uncertain of these costs, we ask you to check with your local post office prior to making a purchase from us. Thank you!Thank you for taking the time out of your busy day to look at our Ebay items!