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TSU-21PNEM Digital Sound Decoders

The TSU-21PNEM is a 1-amp Digital Sound Decoder with six function outputs designed for easy plug-in operation when mated to a 21-pin NEM connector.

Dimensions: 30.5 x 15.5 x 6.5mm Max. Motor Stall Current: 1A
Max. Function Current: 100mA (each output) Function Outputs: 6
Audio Amplifier: 2 Watts, 8-Ohm Load DCC Track Voltage: 7.5V – 22V


The Tsunami2 line is equipped with powerful new amplifiers; therefore, it is important to choose a capable speaker to use with these decoders. Below you will find a list of speakers that are compatible with the TSU-21PNEM.

P.N. Description P.N. Description
810153 28mm Round Speaker 810154 *15 x 12 x 11.5mm Mini Cube
810078 40 x 28.5mm Oval Speaker 810129 23mm Square Mega Bass Speaker
810113 35 x 16mm Oval Speaker 810130 27mm Round Mega Bass Speaker
810115 35 x 20mm Oval Speaker 810131 28mm Square Mega Bass Speaker

* Note:

The Mini Cube Speaker, P.N. 810154, can be used when wired in series with another Mini Cube Speaker.

MSRP $109.95
P.N. Description Sound Selection Reference
884003 TSU-21PNEM Steam (Discontinued 08/2018) Steam Sounds
884008 New! TSU-21PNEM Steam-2 Steam-2 Sounds
885009 TSU-21PNEM EMD Diesel EMD Diesel Sounds
885023 New! TSU-21PNEM EMD-2 Diesel EMD-2 Diesel Sounds
885010 TSU-21PNEM GE Diesel GE Diesel Sounds
885011 TSU-21PNEM ALCO Diesel ALCO Diesel Sounds
885012 TSU-21PNEM Baldwin & Other Diesels Baldwin & Other Diesels Sounds
886003 TSU-21PNEM Electric Locomotives Electric Sounds