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Friday, December 18, 2015

Input transformers

Input transformers - helping a friend to clear his personal collection of input transformers. 

What are the functions of input transformers?
  • Signal isolation / equipment isolation
  • Eliminate ground loop
  • Conversion - SE to balance, balance to SE
  • Impedance matching 
  • Step-up / step-down 
  • Etc
 Notes:
  • These are used transformers. Outlook will not be perfect.
  • Measurements are just for reference - quick test only from the seller. 
  • Buyers are to research the items properly before making purchase.
  • Limited stocks - kindly book early.
Here goes!

UTC A-22 (1pr only)
  • 500R : 500R
  • 40Hz - 20kHz 
  • Square metal shield, 38x38x50mm, weight ~270g/pc
  • U$300/pair
 




UTC A-20 (1pr only)
  • 500R : 500R
  • 10Hz - 50kHz (excellent)
  • Square metal shield, 38x38x50mm, weight ~270g
  • U$400/pair (reserved)




Tamradio (Tamura) HT5-004901-003 
  • 600R : 500R
  • Primary DCR ~57R, primary inductance ~60H
  • Secondary DCR ~44R, secondary inductance ~60H 
  • Measured frequency response ~10Hz - 30kHz +/- 0.2dB
  • 52x33x50mm, weight 0.7KG/pair
  • U$100/pair







  Tamradio HG3-1255-01 HYB-75-380U
  • 75R : 380R
  • 35x25x45mm
  • Weight ~0.1KG/pc
  • U$80/pair






 Tamradio 
  • 75R : 600R
  • Copper plated iron case, double shielded
  • 30x23x18mm
  • U$80/pair





Nihon Kohden TF-3
  • 600R / 200R : 600 (150R + 150R)
  • Can be used to unbalance to balance conversion
  • 52x50x34mm
  • Measured response ~10Hz - 36kHz -0.4dB, 20Hz - 20kHz -0.1dB
  • U$120/pair





Nihon Kohden SEC M13178
  • 75R : 600R
  • 75x43x70
  • Weight ~0.8KG/pair
  • U$120/pair





German made CGT 
  • 500R : 600R
  • 2 input windings and 2 output windings
  • Primary inductance, in series ~8-9H, DCR ~12R
  • Secondary inductance, in series ~7-7.5H, DCR ~6.5R
  • 110x40x110mm, 2.4KG/pair
  • Quick measurement 20Hz ~50kHz -0.5dB, 50Hz - 30kHz -0.3dB
  • U$180/pair



J&K Audio Design
12/19/2015



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