Hammond 126A 5K Single-Ended Interstage Transformer, 15 mA Bias
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Create Free Business AccountKey Features
- 5K to 5K ohm interstage, 178 ohms DCR each winding
- Rated for 15 mA DC bias on a gapped core; 59 H inductance
- Driver use only in single ended tube output amplifiers
- Bifilar wound; minimum 20 Hz - 20 kHz (+/- 1 dB)
- 400 VDC max working voltage, hi-pot tested at 1,000 VDC
- Closed style, minimum 8" leads, 29M6 silicon laminations
- RoHS and REACH compliant
The 126A is a 5K to 5K ohm tube driver interstage transformer designed for driver use only in single ended tube output amplifiers. It replaces a coupling capacitor circuit between the driver and output stages for improved sound, and is aimed at single ended amplifier designers and DIY builders.
The 126A carries a rated DC bias current of 15 mA on a core that is gapped to support that current, with an inductance of 59 henrys. Primary and secondary are both 5K ohms with 178 ohms DC resistance each, and the 4 audio watt rating is shared across the 126 Series. All 126 models use bifilar wound windings for coupling and bandwidth, and the series is specified for a minimum frequency response of 20 Hz - 20 kHz (+/- 1 dB max, ref. 1 kHz).
The core is built with hi grade 29M6 silicon laminations. Maximum working voltage is 400 VDC and units are hi-pot tested at 1,000 VDC.
The 126A is a closed style transformer with leads at least 8 inches long. Dimensions are A 2.50 in (64 mm), B 3.12 in (79 mm), C 3.12 in (79 mm), D 2.00 in (51 mm) and E 2.25 in (57 mm), with 0.20 in (5 mm) x 0.38 in (10 mm) mounting slots. The series lists a unit weight of 3 lbs. 2 oz., while the part's shipping weight is listed as 1.2 lbs (0.54 kg). It is RoHS and REACH compliant. Compared with the 126B, which shares the 5K impedance, this model has a lower 15 mA bias rating and a higher 59 H inductance.
Ideal For
- Interstage coupling in single ended tube amplifiers
- Replacing driver-to-output coupling capacitors
- Single ended tube driver stages at 15 mA
Overview
| Series | 126 Series Tube Driver - Interstage |
| Application | Driver use ONLY in single ended tube output amplifiers; replaces coupling capacitor circuits |
| Description | Audio transformer, tube driver, interstage, for single ended tube amplifiers |
| Part Number | 126A |
| Short Description | INTERSTAGE AUDIO TX |
Dimensions
| A | 2.50 in (64 mm) |
| B | 3.12 in (79 mm) |
| C | 3.12 in (79 mm) |
| D | 2.00 in (51 mm) |
| E | 2.25 in (57 mm) |
| G - Mounting Slot | 0.20 in (5 mm) x 0.38 in (10 mm) |
| Unit Weight (Series) | 3 lbs. 2 oz. |
Electrical
| Inductance | 59 Henrys |
| Audio Watts | 4 |
| Hi-Pot Test | 1,000 VDC |
| Primary Impedance | 5K ohms |
| Frequency Response | Minimum 20 Hz - 20 kHz (+/- 1 dB max, ref. 1 kHz) |
| Secondary Impedance | 5K ohms |
| Primary DC Resistance | 178 ohms |
| Maximum Working Voltage | 400 VDC |
| Rated DC Bias Current | 15 ma. |
| Secondary DC Resistance | 178 ohms |
Identifiers
| UPC | 623980024172 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 1.2 lbs (0.54 kg) |
Construction & Finish
| Core | Gapped to support the specified D.C. bias current |
| Leads | Minimum 8" long |
| Style | Closed style |
| Windings | Bifilar wound |
| Laminations | Hi grade silicon laminations (29M6) |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What is the 126A used for?▾
Driver use only in single ended tube output amplifiers, where it replaces a coupling capacitor circuit for improved sound.
How much DC current can flow through the 126A?▾
It is rated for 15 mA DC bias current; the core is gapped to support that current.
How does it differ from the 126B?▾
Both are 5K to 5K ohm; the 126A is rated 15 mA with 59 H inductance, while the 126B is rated 30 mA with 44 H.
What is the maximum voltage?▾
Maximum working voltage is 400 VDC, and units are hi-pot tested at 1,000 VDC.
What frequency response does it have?▾
Minimum 20 Hz - 20 kHz (+/- 1 dB max, ref. 1 kHz).