Unplated OFC Oxygen-Free Copper Y-Terminals for McIntosh 5.5Y-3.5 (Set of 4)

・Made in Japan, Non-plated, High Purity OFC Oxygen-Free Copper Y-Lug Terminals (Crimped)

・Ideal size for the harmonica terminals of vintage McIntosh models such as MC240, MC275, MC2505, MC2105, etc.

・We believe these will also work with other McIntosh models and vintage Marantz amplifiers that use harmonica terminals. Please check the dimensions.

・Designed to prevent sound quality degradation caused by plating on the contact surfaces.

・Also effective for speaker terminals if the diameter matches.


● Connection Post Diameter: Up to 3.7mm (M3.5)
● AWG: 12 - 10
● Stranded Wire: 2.63 - 6.64 mm2
● Solid Wire: 1.82 - 2.89 mm


Recommended for those who are having trouble with the harmonica terminals for connecting speaker cables on vintage McIntosh amplifiers.

Many people want to connect thick cables directly but due to issues like limited connection space on the terminals, small screws, and contact problems with cable whiskers, they end up using thinner cables or brass banana plug compatible terminals.

We have prepared terminals that are a perfect fit for these less-than-ideal harmonica terminals.

Furthermore, using commercially available electrical Y-terminals for speaker cables is often said to cause sound quality degradation, dulling of the sound image, and poor clarity in the mid-high frequencies due to the effects of tin plating, both in the past and present.

Even high-quality, expensive speaker cables can be ruined by tin plating.

Various platings exist for speaker-related contacts, such as gold, silver, platinum, and rhodium plating.

It is also a well-known fact that each plating has its own sound-shaping characteristics (quirks) with different tendencies.

For a pure innocence and straight sound without coloration, non-plated is indeed the best choice.

Non-plated OFC high-purity oxygen-free copper Y-lug terminals are hard to find.

For those using high-purity, high-quality copper speaker cables, non-plated terminals made of the same metal are optimal.

Please give them a try.

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