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Ken's Electronics, (Wholesale & Retail Electronic Parts) Kalamazoo, Michigan

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Audio & CB Modulation Transformers
E35-002 Mod Xmfr Pace123A RobynTR123C Surveyor2300 & other CBs $12.95
OPTE-35 Audio Modulation Transformer: Robyn DC30 GT7C SX101 SX401 XL-1 etc $12.95
OPTE-35: some labeled 20t, =Thordarson TR-784, Robyn 401005
TF-106 Audio Modulation Transformer used with UPC1156H audio IC's $12.95
TF-107 Audio/Modulation xmfr use with UPC1156H & MB3710 AM500D & (1977) 29XLR $12.95
TF-109 Audio/Modulation transformer used with UPC1156H audio IC's $12.95
TF-112 Audio/Modulation xmfr use with UPC1156H & MB3710 (1978) 29XLR use TF-107
TF-129 Uniden/Cobra Audio/Modulation transformer: use 110004 to replace
TF-154 Uniden/Cobra Audio/Modulation transformer: use 110004 to replace
TF-177 Uniden/Cobra Audio/Modulation transformer: use 110004 to replace
KETR-010-B Recent Cobra 29 with TDA2003 audio IC: use 110004 to replace
240012 audio output 5-10K tube impedance to 4-8 ohm spkr $14.95
core 1-3/8" long, 1-3/4" high, 9/16" thick, mount centers 1-3/4"
240012 Primary: White=B+, Red=Plate; Secondary: Yellow=Spkr, Black=Ground
240012 compatible with radios using 6AQ5, 6BQ5, 6V6, 12AQ5, 12V6, 25V6, 35C5, 50L6, 50B5, 50C5 & other tubes
S-1738 Demco AM30WBR2535 push pull 20-25 Watt audio output transformer for pair of 6BQ5 & similar tubes ($25.00)
20t Robyn audio output xmfr
E24-003 Robyn audio output xmfr
S691M Robyn audio output xmfr
Robyn Red audio output xmfr
110004 Robyn sub for TF129 & TF154 & TF177 for 25&29GTL/LTD & PC66/76 etc $12.95
TF-129 SchematicTF-129, TF-154, KETR-010-B110004 Wire Colors TF-177 positions
Using 110004 to replace TF129 & KETR-010-B (Cobra 29), TF154 & TF177 (Cobra 25) see drawings above
Perspective for above drawings: looking down at parts side of the circuit board
TF-129 & TF-154 & TF-177 & KETR-010-B Function110004 Color equivalents
S1 =Speaker lead #1use Black wire of 110004
P1 =Primary lead #1use Brown wire of 110004
P2 =Primary lead #2=Centertapuse Yellow wire of 110004
P3 =Primary lead #3use Orange wire of 110004
S2 =Speaker lead #2use White wire of 110004
Red & Blue wires not used for this application
General Purpose Audio Transformers
CR45-698 audio xmfr 1/2"cube insulated wire "line level" 600 ohm to 600 ohm impedance $5,55
two CR45-698 eliminate ground loop buzz when computer connects to audio system
CR45-699 audio xmfr 1/2"cube bare wire "line level" 600 ohm to 600 ohm impedance $5,55
use CR45-699 for ground loop isolation to eliminate Public Address system hum
[20+] CR45-700 audio xmfr 3/4x5/8x5/8" insulated wire 100K to 1K ohm mic impedance matching $11,70
CR45-701 audio xmfr 3/4x5/8x5/8" insulated wire 1.2K to 3.2 ohm $7.00
CR45-704 audio xmfr 1/2"cube insulated wire 500-CT to 3.2 ohm $7,50
CR45-705 audio xmfr 3/4x5/8x5/8" insulated wire 20K to 1K ohm $8,70
CR45-707 audio xmfr 3/4x5/8x5/8" insulated wire 10K to 2K-CT $8,40
CR45-708 audio xmfr 1/2"cube insulated wire 10K to 2K-CT $7.80
CR45-709 audio xmfr 3/4x5/8x5/8" insulated wire 500-CT to 3.2ohm $7,80
CR45-710 audio xmfr 1/2"cube insul wire 500-CT to 8 ohm $5,85
CR45-711 audio xmfr 3/4x5/8x5/8" insulated wire 1K-CT to 8 ohm $7,20
CR46-711 useful for homebrew Music On Hold telephone line circuit
CR45-712 audio xmfr 3/4x5/8x5/8" bare wire 10K to 2K-CT $4,50
CR45-713 audio xmfr 3/4x5/8x5/8" bare wire 500-CT to 3.2 ohm $4,50
CR45-714 audio xmfr 3/4x5/8x5/8" bare wire 1K-CT to 8 ohm $4,50

Free Technical Repair Tip: Build your own (cheap) Audio Ground Loop Isolator. Ground Loops often introduce hum into Home Theatre systems when multiple components--such as Computers, TV's, Stereos, DVD players, VCR's are connected together. Use audio transformers with the appropriate impedances for your application. RCA Plugs and Jacks found on most components are "Line Level"--typically 600 ohm so CR45-698 and CR45-699 are appropriate for many applictions. If you are working with a different impedance and don't see audio transformers in the paragraph above--simply find a transformer with the right impedance on one side--and use two of them "back to back" to get the desired impedance. If your hum problems disappear when you disconnect your TV cable wire--then you need an RF Ground Loop Isolator (see our TV ANTENNA webpage): CR75-504 RF Isolation Transformer 75 ohm input & output $9,75

PA Speaker Line Matching transformers
45-720 for 8 ohm 5W speaker to 25V & 70V PA outputs $6,90
45-722 =T-64A xmfr for 8 ohm 10W spkr to 25V & 70V PA system $9,00
T-110 xmfr for 8 ohm 10W spkr to 70V PA system wiring $9,00
45-788 speaker 50W transformer for 70V PA outputs $26,00
 
Transformer
Revised December 2014; kt, Copyright © 1997 Fernando Lezica, All Rights Reserved.