Hammond 124F 15K CT to 3.75K/15K Dual-Secondary Interstage
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Create Free Business AccountKey Features
- 15K ohm centre-tapped primary with dual 3.75K / 15K ohm secondary
- 5 W audio rating for tube driver interstage duty
- Grain-oriented steel laminations
- Primary DCR 900 ohms, secondary DCR 899.6 ohms
- Open style, minimum 5" primary leads, 0.19 in (5 mm) mounting holes
- Series frequency response 150 Hz - 15 kHz (+1/-3 dB) @ 1 kHz
- RoHS and REACH compliant
The 124F is a 5 watt tube driver interstage transformer with a 15K ohm centre-tapped primary and a dual secondary rated 3.75K / 15K ohms. The short description identifies it as a 15k-15k tube driver. It is intended for general purpose or replacement use in push-pull or phase inverter tube driver circuits, making it a fit for valve amplifier designers and service technicians.
DC resistance is 900 ohms on the primary and 899.6 ohms on the secondary according to the series ordering table (the part page lists 900 ohms). The core is built with grain-oriented steel laminations, and the 124 Series is specified for a minimum frequency response of 150 Hz to 15 kHz (+1/-3 dB) referenced to 1 kHz.
Physically the 124F is an open style transformer with primary leads a minimum of 5 inches long. Its outline dimensions are A 2.88 in (73 mm), B 1.75 in (44 mm), C 2.37 in (60 mm) and D 2.38 in (60 mm), with 0.19 in (5 mm) mounting holes. Shipping weight is 1 lb (0.45 kg).
Because the series has no gap for DC bias current present in SE mode, this transformer should not be used for single ended applications. It is RoHS and REACH compliant, with UPC 623980240336 for inventory and ordering systems.
Ideal For
- Push-pull tube driver interstage
- Phase inverter tube driver circuits
- Replacement interstage transformer in valve amplifiers
Overview
| Style | Open style |
| Series | 124 Series Tube Driver - Interstage |
| Description | Transformer, tube driver, interstage, 5 watts, for push-pull circuits |
| Part Number | 124F |
| Circuit Type | Push-pull or phase inverter tube driver circuits |
| Primary Leads | Minimum 5" long |
| Single-Ended Use | Not for single ended applications; no gap for DC bias current present in SE mode |
| Short Description | AUDIO TX TUBE DRIVER 15k-15k |
| Frequency Response (Series) | Minimum 150 Hz - 15 kHz (+1/-3 dB) @ 1 kHz |
Dimensions
| A | 2.88 in (73 mm) |
| B | 1.75 in (44 mm) |
| C | 2.37 in (60 mm) |
| D | 2.38 in (60 mm) |
| G - Mounting Hole | 0.19 in (5 mm) |
Electrical
| Audio Watts | 5 |
| Primary Impedance | 15K ohms C.T. |
| Secondary Winding | Dual |
| Secondary Impedance | 3.75K / 15K ohms |
| Primary DC Resistance | 900 ohms |
| Secondary DC Resistance | 899.6 ohms (ordering table); 900 ohms (part page) |
Identifiers
| UPC | 623980240336 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 1 lbs (0.45 kg) |
Construction & Finish
| Laminations | Grain Oriented Steel |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What are the 124F impedances?▾
15K ohm centre-tapped primary and a dual secondary rated 3.75K / 15K ohms.
What is the power rating?▾
5 audio watts.
What core material is used?▾
Grain-oriented steel laminations.
Can the 124F be used single ended?▾
No. The 124 Series has no gap for DC bias current present in SE mode and should not be used for single ended applications.
What are its dimensions?▾
A 2.88 in (73 mm), B 1.75 in (44 mm), C 2.37 in (60 mm), D 2.38 in (60 mm), with 0.19 in (5 mm) mounting holes.
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