ARS NB9M

Heath Tube-Type LMO Repair (PDF)


Care & Restoration 0 Comments 02/08/2018 (This is a Level 1 Resource)

Glen E. Zook, K9STH

Posted By: Bradley Stone (UncleBrad)

The tube-type Linear Master Oscillators (“LMO”) used in the Heathkit SB-Line equipment is a very stable and accurate means of controlling the frequency in the equipment. Unfortunately, as the units age, many LMOs develop a “warble” when tuning. This “warble” usually stops when the frequency control knob is not rotated. However, accurately “zero-beating” another station is made harder by this “warbling” and it is generally a major distraction from the otherwise excellent performance of the SB-Line equipment.


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PDF FIle: Heath Tube-Type LMO Repair