This Amateur Service Agency Bulletin (ASAB) listing may be of interest. I have some of these bulletins (*) and I can make them avaliable on the site if requested. (The dial alignment ASAB is presently avaliable here and can be accessed from the main menu.) ASAB NO EQUIPMENT TYPE DATE DESCRIPTION 1001* None - General 05/11/60 General Information ASAB's Information 1002* KWM-2/2A 08/01/60 Audio Squeal in Transmit Where AP Control is Advanced 1003* KWM-2/2A 08/02/60 Troubleshooting Aids 1004* KWM-2/2A 08/03/60 Information 75S-1/2 1005* KWM-2/2A 12/23/60 Service Information 75S-1/2 30S-1 136B-2 1006* KWM-2/2A 05/05/61 Service Information 1007* KWM-2/2A A. Main Tuning Dial Assembly and Repair 32S-1/2 B. PTO to Tuning Dial Alignment 75S-1/2 312B-5 1008 30L-1 02/12/62 Production Changes 1009* KWM-2/2A 07/03/62 Information 32S-1/2 1010 516F-2 11/16/62 A. Bias Diode Change and Capacitor Change B. Bias Voltage Range Increase C. Check Wiring of Fuse F1 1011* KWM-2/2A 06/26/63 Main Tuning Dial Assembly and Associated Parts 32S-1/2/3 62S-1 75S-1/2/3/3A 312B-5 399C-1 1012 30S-1 10/10/63 Intermittent Dropout of Plate Overload Relay Revised 11/20/63 1013* KWM-2/2A 03/18/64 Noise Activation of AGC System 1014* KWM-2/2A 05/31/65 Main Tuning Dial Assembly and Associated Parts 32S-1/02/3 51S-1/1A/1AF/1F 62S-1 75S-1/02/3/3A 312B-5 399C-1 1015 30S-1 06/30/65 1. Cabinet Vibration Elimination 2. Excessive ALC Control 1016* KWM-2/2A 10/12/65 A. Crystal Calibration B. "Yelp" Problem C. Reduce Low-Frequency Spurious D. High-Frequency Tweets E. Eliminate 0.455 KC Signal Bypassing Transmit Mixer F. Improve Carrier Balance 1017 32S-3 10/16/65 1. 80-Meter Spurious Reduction 2. Updated Balanced Modulator For the very best collection of Collins service bulletins, try Marvin Born's book. Marvin Born, KF8XU 7956 Greenside Lane Worthington, Ohio 43235 614-436-9000 Offers the following: "Service Modification Compendium for the S-Line and KWM-1/2/2A." 260 pages - $45.00 ? "Service Modification Compendium for the KWS-1, 32V, and 75A Series." 42 pages - $15.00 KWM2 Service bulletins can also be downloaded and printed (as scanned .gif images) from: ftp://bama.sbc.edu/downloads/collins/kwm2sb/ Boatanchor Manual Archive - ftp://bama.sbc.edu Although the download versions may be a little fuzzy, they are readable.
