International Crystal Manufacturing Co.
Made-to-order crystals for Collins equipment. Give radio model number and/or Collins part number when calling as they are not listed in catalog. ICM will make band crystals as well as upper and lower sideband and calibrator crystals. VISA/MasterCard/AMEX
Electric Radio Magazine
ER is a monthly magazine that is devoted to vintage radio. ER is a source for the “Collins Compendiums” which are 3-ring-bound reprints of all technical service bulletins for the S-Line, KWS-1 and 75A-4 (three volumes). ER also stocks several books and videos about Collins equipment. An ER Magazine subscription is $34 per year in US ($45 first class mail) See their website at ermag.com . The current Editor is Ray Osterwald, N0DMS.
HI-RES Communications, Inc.
Floyd Soo, W8RO
Repair and maintenance videos and CDs for popular Collins radio equipment. Hi-Res also sells the PDC-1 peak reading wattmeter kit which converts ANY average reading wattmeter, including the 312B-X series, to a true PEP reading instrument for less than $30. VISA/MASTERCARD accepted.
Nationwide Radio & Eq. Sales LLC
Mark Olson, KE9PQ
Collins mechanical filters for the 75A-4. Available bandwidths: 6khz and 10 khz AM, 2.5 khz SSB and 500hz CW. $195.95 each plus $7.00 shipping. ($15.00 international). Pictures and more info is available on my web site.