If you had the original service manual, you would find out what that part number represents from the parts list. It doesn't apppear to be posted on the internet, from what I can tell. Maybe the following site might have the answer:
http://www.justradios.com/oldtvschematics.html#Z
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Technics SL-D2, Pioneer SA-7500, Mitsubishi M-A4370, Rotel RB870 Power Amplifer, NHT Model II Speakers, Grado SR60.
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