Complete Microphone Input Transformer Product List & Specifications

Part No.Turns RatioImpedance RatioCommentsConnection MethodOriginal Customer
13K7-APC1:5150:3.75K Printed circuit pins
731061+1:16150/600:40KLead wires
731121:8 1:8 150:10KLead wiresAssociated Sound
7341PC1+1:16150/600 : 40KPrinted circuit pins.Warm Audio
751121/2:9.650/200:14KPrinted circuit pins. Sphere Electronics
767121:8150:10KLower inductance than CMMI-8APCLead wiresJE-110K-D Jensen
771111:10Lead wires
781051:1150:150 {1.5K:1.5K}Mic coupler. For Universal Studio's specific phantom power requirement.Lead wires.Universal Studios 1978
79411/2:11.5150/600:20KPrimary windings each isolated by Faraday shields.Printed circuit pins.
812041: 11.5K:1.5KHigh inductance. Printed circuit pinsJensen JE-8043
B11178D1+1:10150/600:15KLead wiresU.R.E.I.
CM-11531+1:8150/600:10KHigher inductance than CMMI-8B3. Dual primaries.Lead wires or PC Pins. Bryce Young/Warm Audio
CM-11811:1:1:1150:150:150:150Extreme bandwidthLead wires. Multi-filar.Undertone
CM-121191+1:5150/600 : 3.75KDual primary windings (hum-bucking)Printed circuit pins or lead wires.
CM-12911+1:5150/600 : 3.75KUpgraded CMMI-8B3Lead wires.Warm Audio
CM-17901PC1+1:24150/600:86.4KPrinted circuit pins.
CM-20601PC1:1150:150124DU laminations. Hum-bucking. mu-metal can optional.Printed circuit pins.
CM-2239PC1+1 : 2.5+2.5150/600:6.5KHum-bucking. No mu-metal can.Printed circuit pins.
CM-24381:10/20150/600:15K/60KHum-buckingLead wires. John Hall/Steve Firlotte/Inward Connections
CM-2511STD1+1:10 150/600:15KUpgraded B11178DLead wire or PC PinsB11178D U.R.E.I.
CM-271101:8 150:9.6KHum-bucking. 124DU laminations.Lead wires (or PC Pins large quant only)
CM-271101:8150:9.6KHum bucking. Mu-metal can optional.Lead wires or pinted circuit pins
CM-281211CT + 1CT: 4CT + 4CT37.5/150/600:2.5K + 2.5KLead wires or printed circuit pinsLangevin TF425C. AM-16 Preamplifier.
CM-3213PC1+1:10150/600 : 10KSimilar to early API input transformers, but higher inductancePrinted circuit pins. Revive Music
CM-4223PC1:7150/600:10KDual primary windings (hum-bucking)Printed circuit pins.
CM-49621+1:10150/600:15KDual primary windings (hum-bucking)Lead wires.
CM-6101150/600 : 600150/600 : 600Small footprint. No mu-metal can.Printed circuit pins. Marquette Audio
CM-75101A1+1:10 150:15KCM-75101AT available with tapped primary windings.Lead wires or PC Pins.Quantum Audio
CM-9955-T50,200,300,600,1200,2400:9.1K50,200,300,600,1200,2400:9.1KHum-bucking Lead wires only.Groove Tubes "Vipre"
CM-9994A1+1:24 150/600:85K+3dBu/150Ω >+24dBU/600Ω @20HzLead wires only.
CM-E146501/2/4:4037.5/150/600:60KLead wires
CMMI-10APC1:10 150:15K-2dBu @20HzPC Pins only. Wide bandwidth.
CMMI-10B/PC1:10150:15K-1dBu @20HzLead wires or PC Pins. RE-115KE with improved inter-winding spacing
CMMI-10C1:5/10150CT:15K+5dBu @20HzLead wires or PC Pins.
CMMI-2APC1CT:237.5150:600-1dBu @20HzPC Pins only.
CMMI-2C1:2 150:600+8dBu @20HzLead wires or PC Pins. RE-16A
CMMI-3.5APC1:3.5150:1850+0dBu @20HzLead wires or PC Pins.
CMMI-3.5B31:3.5 150:1838-0.05dBu @20HzLead wires or PC Pins.
CMMI-3.5C1CT:3.537.5/150:1850+9dBu @20HzLead wires or PC Pins. Center tapped.
CMMI-5C1CT:537.5/150:3.75K+10dBu @20HzLead wires or PC Pins. Center tapped.RE-13K7A
CMMI-7B3PC1+1:750/200:9.8KVintage soundLead wires or PC Pins.
CMMI-7C1CT:7 50/200:9.8K+7dBu @20HzLead wires or PC Pins. Center tapped.
CM-MI851+1:10150/600 : 15KEmulates Sescom MI85Lead wires.
CMMI-8APC1:8150:10KJE-110K-HPC -2dBu @20HzPrinted circuit pins only. QEE-7100-01 QuadEight
CMMI-8B3/PC1:8 150:10K-1dBu @20HzLead wires or PC Pins.
CMMS-2150:150150:150Dual Faraday shielding.DUAL USES: Mic splitter/Mic Input
CMQEE-3440A1:9/18/3637.5/150/600:50KFor the PC pin version, 2 ratios available.Lead wires or PC Pins. QuadEight
ET-80261:15.5/8.9/4.550/150/600:3K/12KElectrodyne. Hum-bucking. Mu-metal case.Lead wires. ET-8026
ET80561:9/18/3650/200:50KLead wires or PC Pins.Electrodyne/Cetec
JE-110K-B 1:8150:10KLead wiresJensen
JE-110K-C1:8150:10KLead wiresJensen
JE-110K-D1:8150:10KLead wiresJensen
JE-110K-F1:8150:10KOBSOLETEPrinted circuit pinsJensen
JE-110K-HPC1:8150:10KPrinted circuit pinsJensen
JE-115KD&E1:10150:15KSee CMMI-10B for improved performanceJensen
JE-115K-MAX1:10150:15KLE-187 LaminationsOBSOLETEJensen
JE-135K-A1:15 150:35KLead wires. Jensen
JE-135K-D1:15 150:35KSlightly lower inductance than JE-135K-1Jensen
JE-145K-C1:15150:35KJensen
JE-150K-A 1:18 150:50KJensen
JE-150K-C1:18 150:50KJensen
JE-4KB-APC1+1:5150/600 : 4KPrinted circuit pinsJensen
JE-6110K-APC1+1:8150/600 : 10KJensen
JE-6110K-B1+1:8150/600 : 10K+8dBu EI-375 high nickel laminationsJensen
JE-6110KBP1+1:8150/600:10KLead wires, or printed circuit pins. Jensen
JE-6115K-B1+1:10150/600 : 15KRE-0887 marked as JE-6115K-B
JE-615K-A1+1:10150/600 : 15KJensen
JE-80431 : 11.5K:1.5KHigh inductance. EI-375 laminationsJensen
RE-08871+1:10150/600 : 15KAlso see JE-6115K-BLead wires or PC Pins.Wally Heider Recording
RE-115K-E / PC1:10150:15KSee CMMI-10BSee CMMI-10APC
RE-135K-31:2600:2.4KLead wiresMcKinney - Requisite Audio
RE-13K6-C1:9.5150:3.6KLead wires.
RE-15K7-A RE 151501:10 150:15KEI-375 laminatinos
RE-16APC1:2150: 600EI-375 laminations.See CMMI-2C
CM-240961+1:5150/600:3.75K +12dBu/+16dBu Improved performance compared to LL1538BLead sires or PC Pins.