for the aluminum smelter in Ghana, see Volta Aluminum Company
In the 1930s, Valco was formed by three business partners and former owners of the National Dobro Company; Victor Smith, Al Frost, and Louis Dopyera. The company name was a combination of the three partner's first initials (V. A. L.) plus the common abbreviation for company (Co.)
Valco manufactured Spanish acoustic guitars, metal-faced resonator guitars, electric lap steel guitars, and vacuum tube amplifiers under a variety of brand names including Supro, Airline, Oahu, and National. They also made amplifiers under contract for several other companies such as Gretsch, Harmony and Kay. In the 1960s they began producing solid body electric guitars.
- Wright, Michael (2002). "Supro Guitars and Amplifiers Part I - Supro Part 1". Vintage Guitar Magazine (September 3, 2002).
Article about Valco's Supro brand
- Wright, Michael (2007). "Supro Resophonic FolkStar". Vintage Guitar Magazine (April 4, 2007).
Article about Supro's resonator guitars
- ADMIN (2001). "National Westwood and Glennwood - '60s Alt-materials Make Short run". Vintage Guitar Magazine (December 12, 2001).
Article about National's map guitars
- Ray, Will (2012). "Resurrecting a 1957 Supro Dual Tone". Premier Guitar (March 2012).
- Vintage Guitar Info Guy (1995-2002). "National/Valco Vintage Map-shaped Electric Models". Vintage Guitars Info.
- "History of Henry Kuhrmeyer and the Kay Musical Instrument Company. Contains Engelhardt Information". Kay Bass Information and Registration. KayBass.com.
- Tony Bacon, ed. Electric Guitars: the Illustrated Encyclopedia. San Diego: Thunder Bay, 2000. Pp. 243, 287.
- Vintage Guitar Info Guy 1995-2002.
- ADMIN 2001.
- Wright 2007.
- Ray 2012.