Thorens BL 104
A vintage tonearm made by Thorens, commonly fitted to several of their mid-20th century turntable models.
Overview
The Thorens BL 104 is a tonearm manufactured by Thorens and used on multiple turntable models, including the TD 124, TD 134, and TD 184. It is also documented as being mounted on the TD 121. Referred to in various sources as the "stock" arm for the TD 124, the BL 104 appears to have been a standard component across Thorens' turntable lineup during its production period. The tonearm features a 3-pin headshell connection and includes a tonearm lift linkage with two fixing screws for adjustment.
Design
The BL 104 uses a 3-pin headshell and incorporates a tonearm lift linkage adjustable via two fixing screws. Early tonearms from Thorens, including the BL 104, were noted for a design resembling a "half-..." form factor, distinct from later models.
Context
The BL 104 was standard equipment on the Thorens TD 124, TD 134, and TD 184 turntables, and has been observed on the TD 121. Its inclusion across these models suggests it was a core part of Thorens’ turntable assembly strategy during the era of its use.
Market
The BL 104 is described as rare in current market listings and is often sold untested and as-is due to its vintage status. Replacement parts, such as the tonearm lift linkage and headshells, are available separately and also noted as rare. A forum post titled "Fixing a Thorens BL 104 tonearm [Thorens TD 134]" indicates that maintenance or repair may be required, and a manual is accessible via vinylengine.com.
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