Telex 510 Headphones Made in USA Vintage Over Ear Wired Audio Telex 510 headphones offering a classic audio experience. These over-ear headphones feature a durable design with comfortable earcups and an adjustable headband. The attached cable includes a standard 1/4 inch audio jack, suitable for connecting to various audio sources. Manufactured in the USA, these headphones represent a piece of audio equipment history. The only thing I had to “test” was a karaoke machine. I did hear feedback, but couldn’t test them as they would work Keywords: vintage audio, retro headphones, wired headphones, over ear, audio equipment, professional audio, studio headphones, classic design, conserved item, collectible audio ALL OFFERS CONSIDERED