Hammond 124 Series Tube drivers 

Interstage Transformers 

124 Series Tube Driver - Interstage Transformers
Part Watts Primary
 DC Resistance
124A 5 watts 10k 403 90k C.T 1524 C.T
124B 5 watts 10k 403 90k C.T 1500 C.T
124C 5 watts 10k 403 90 C.T  1524 C.T
124D 5 watts 7k C.T 454 15.8k C.T 681 C.T
124E 5 watts 15k C.T 728 33.8k/135k 3880 Dual
124F 5 watts 15k C.T 900 3.75k/15k 899.5 Dual
  • Designed for general purpose or replacement use in push-pull or phase inverter tube driver circuits.
  • Should not be used for single-ended applications. They have no gap for DC bias current present in SE mode.
  • Open style with minimum 5" long primary leads.
  • Minimum frequency response 150 Hz. - 15 Khz (+/- 1db max. ref. 1 Khz.) at full rated power.
  • Part number 124B is the same as our 124A except for 49% Nickel laminations for greater fidelity.
  • Part number 124C is the COIL ONLY (for those experimenters who want to use their own "iron").

Hook Up Data

  • For Parallel connected operation (33.8K Ohm Secondary):
    • Connect the GRN/YEL wire to the GRN wire AND the BLK/YEL wire to the BLK wire.
  • For Series connected operation (135K Ohm Secondary):
    • Connect the BLK/YEL wire to the GRN (this becomes the centre tap) - GRN/YEL and BLK wires are the output.
SKU 124series
Brand Hammond
Shipping Weight 0.6000kg
Shipping Width 0.060m
Shipping Height 0.060m
Shipping Length 0.060m
Unit Of Measure ea

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