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