Vintage Sylvania JAN-CHS-6SN7GT VST-231 vacuum tube from the World War II era, still in new stock. This black plate tube was manufactured in the United States, making it a valuable collector's item for vintage electronics enthusiasts. With the iconic Sylvania brand and VST-231 model, this vacuum tube is sure to appeal to those looking to restore or complete their vintage audio equipment collection. Single untested vacuum tube. Silver shows no wear