Yamaha TG-55
A rack-mount tone generator with a price tag, and a paper trail of ROM cards and magazine ads.
Overview
The TG-55 survives in the record mostly through the gear around it, not through a clean spec sheet. The documentation does confirm the basics. It was announced as a rack-mount version of the SY55 keyboard, and it carried a price of $995 when new. That figure comes from a contemporary trade writeup covering the NAMM announcements. The writeup described the SY55 as Yamaha's newly announced sample-playback keyboard and the TG55 as its rack-mount sibling - the same instrument minus the sequencer. The pitch was simple: you get the SY55's voice set in a rack, and you skip paying for a keyboard and a built-in sequencer you didn't need.
The SY55/TG55 pairing shows up again and again in the period press. A 1991 sound-developer advertisement in Audio-Collection (April 1991, p.42) listed the SY55/TG55 together as a supported platform for third-party voice libraries, priced at $65 for a Top 40 bank. Yamaha's SY77/TG77 and SY22/TG33 pairs got the same treatment. The TG55 was common enough in studios and home rigs that commercial sound developers built and sold banks for it.
Memory went through Yamaha's own cards. A RAM listing from a Canadian Musician buyer's guide notes the Yamaha MCD32 RAM for the SY55/TG55, with the MCD64 reserved for the SY77/TG77. The TG55 card was "call for pricing" at that vendor, so people were buying it. Third-party ROM cards were also in circulation. The same Valhala listing that sold RAM loaded with a ROM card of the buyer's choice named the SY55/TG55 among the supported Yamaha machines.
One warning for anyone hunting a TG-55 today: the name collides with an unrelated product. A British music-trade item from the period announces a "TG 55 synthesizer" from Top Gear, an American pedal-steel builder, that accepted guitar signals directly and "synthesized" vocals. That is not this module. The Yamaha TG-55 is the rack-mount SY55 derivative. Keep that in mind when searching listings.
The record gives no clean spec sheet. There's no confirmed voice count, no verified filter architecture, and no production start or end date in the material at hand. The TG55 shows up in a 1991 accessory listing and in NAMM coverage tied to the SY55's announcement, which places it in that window, but the paper trail is thin on hard numbers. Be suspicious of any confident "released in" or "X-voice polyphony" claim elsewhere unless it's sourced to Yamaha's own literature.
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