124 Series Spec. Datasheet by Hammond Manufacturing

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8/28/2019 Tube Driver - Interstage (124 Series) - Hammond Mfg.
https://www.hammfg.com/electronics/transformers/audio/124 1/2
Data subject to change without notice
Tube Driver - Interstage 124 Series
Features
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.
Our part number 124B is the same as our 124A except for 49% Nickel laminations for
greater fidelity.
Our part number 124C (below) is the COIL ONLY (for those experimenters who want to
use their own "iron").
If you are looking to replace Radiola III-A audio transformers, check out our universal
radiola replacement unit.
Hookup 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 center tap) - GRN/YEL
and BLK wires are the output.
Part No.
Audio
Primary Secondary
Laminations
Dimensions
Impedance
D.C.
Impedance
D.C.
Winding
Resistance Resistance
ABCD
G
Watts (Ohms) (Ohms) (Ohms) (Ohms) Mtg Hole
124A 5 10K 403 90K C.T. 1524 C.T. Grain Oriented Steel 2.38 1.35 1.43 2.00 0.19
124B 5 10K 403 90K C.T. 1500 C.T. 49% Nickel 2.38 1.35 1.43 2.00 0.19
124C 5 10K 403 90K C.T. 1524 C.T. None-Coil Only - - - - -
124D 5 7K C.T. 454 15.8K C.T. 681 C.T. Grain Oriented Steel 2.81 1.46 1.68 2.38 0.19
124E 5 15K C.T. 728 33.8K/135K 3880 Dual Grain Oriented Steel 2.88 1.74 2.37 2.38 0.19
124F 5 15K C.T. 900 3.75K / 15K 899.6 Dual Grain Oriented Steel 2.88 1.75 2.37 2.38 0.19
© 2019. Hammond Manufacturing Ltd. All rights reserved.
Quality Products. Service Excellence.
8/28/2019 Tube Driver - Interstage (124 Series) - Hammond Mfg.
https://www.hammfg.com/electronics/transformers/audio/124 2/2