Radio1932-01.jpg Radio 1931-05ThumbnailsRadio 1935-10Radio 1931-05ThumbnailsRadio 1935-10Radio 1931-05ThumbnailsRadio 1935-10Radio 1931-05ThumbnailsRadio 1935-10Radio 1931-05ThumbnailsRadio 1935-10

Ad for Triad radio tubes. Type T-247 pentode. Triad Manufacturing Co., Inc., of Pawtucket, Rhode Island.



Source: eBay sellers

Restoration by: magscanner