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ZORKO
Instruments previously built in Chicago, IL during the early to mid-1960s.
The Zorko trademark is the brand name of the Dopyera Brothers (See Dobro and Valco), and was used to market an electric pickup-equipped upright "mini-bass." In 1962, Everett Hull from Ampeg acquired the rights to the design. Hull improved the design, and Jess Oliver devised a new ‘diaphragm-style' pickup. The Ampeg company then marketed the model as the "Baby Bass," (Source: Tony Bacon and Barry Moorhouse, The Bass Book).
Some models in between 70% to 90% have been seen priced between $650 and $1,200. Pricing depends on condition of the body; also, compare pickups between the Zorko and an Ampeg. There may be retro fit kits from Azola, Clevinger, or some of the pickup companies (piezo bridge kits) that may fit a Zorko mini-bass.