BT Sofia Bulgarian TV test card 1988radiotvhistory (25)in #testcard • 7 years ago Test card of Bulgarian main television station "BT1" recorded July 1988 in Stara Zagora. Colour TV system used at the time was SECAM D/K. As far as I know, this is probably the only surviving recording of this test card! ▶️ DTube ▶️ IPFS #test #pattern #tv #dtube
