











11 Days
55
2
$100.00

Venmo
PayPalOwn a museum-worth piece of audio history. Only a handful are know to still exist.
This reel-to-reel BK-401 “Soundmirror” used paper recording tape coated with artificial magnetite particles. Brush Company designed the BK-401 after Semi Begun’s experiments convinced him that a thin, flexible tape would give good audio performance. Introduced in 1947 with tape made by Shellmar Company, the expensive BK-401 malfunctioned easily. Despite good initial sales, production ceased in 1952.
Date Made: ca 1948 Maker: Brush Development Company Place Made: United States: Ohio, Cleveland Model Number: BK-401
KSL Classifieds makes it easy to buy and sell with peace of mind. Check our safety tips and quickly report anything that doesn’t look right to keep your experience smooth and secure.










11 Days
55
2
$100.00

KSL Classifieds makes it easy to buy and sell with peace of mind. Check our safety tips and quickly report anything that doesn’t look right to keep your experience smooth and secure.












Venmo
PayPalOwn a museum-worth piece of audio history. Only a handful are know to still exist.
This reel-to-reel BK-401 “Soundmirror” used paper recording tape coated with artificial magnetite particles. Brush Company designed the BK-401 after Semi Begun’s experiments convinced him that a thin, flexible tape would give good audio performance. Introduced in 1947 with tape made by Shellmar Company, the expensive BK-401 malfunctioned easily. Despite good initial sales, production ceased in 1952.
Date Made: ca 1948 Maker: Brush Development Company Place Made: United States: Ohio, Cleveland Model Number: BK-401









