Triad is pleased to relaunch our J series of shielded audio impedance matching transformers. The parts are manufactured in our California facility, not far from Venice. CA where they were originaly produced, all in strict accordance to the original designs, materials and processes.
Vintage audio recording gear is very popular today, due in some part to the nature of digital recording and the desire to "warm" up the audio signal using vacuum tubes and transformers; as well as the history of the original recording equipment that was used to create, essentially, the American songbook of recorded popular music. Triad transformers were a big part of some of the most important equipment that is still used today in every major recording studio, as well as new recreations of the same vintage circuits used in the booming home recording market.
| Items |
 A-9J 32.7 Ohm Primary DC Resistance J Series Audio Transformer |
 A-10J 33.7 Ohm Primary DC Resistance J Series Audio Transformer |
 A-80J 53.4 Ohm Primary DC Resistance J Series Audio Transformer |
A-11J 50 Ohm Primary DC Resistance J Series Audio Transformer |
A-12J 50 Ohm Primary DC Resistance J Series Audio Transformer |
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| Description | Triad's A-9J Input Transformer provides the durability and precision required in today's demanding designs. Mu-Metal case construction for magnetic field immunity and 60 to 80 dB Hum reduction. Large step-up turns ratio to couple low-level input signals to the grid of the first amplifier tube or, in a multistage system, to the input element of the first transistor amplifier. Low level High Fidelity with excellent Unwanted Noise reduction. Applications include signal pre-amplification, inter-stage isolation, signal level step up/down, and impedance matching. | Triad's A-10J Input audio transformer provides the durability and precision required in today's demanding designs. Mu-Metal case construction for magnetic field immunity and 60 to 80 dB Hum reduction. Large step-up turns ratio to couple low-level input signals to the grid of the first amplifier tube or, in a multistage system, to the input element of the first transistor amplifier. Low level High Fidelity with excellent Unwanted Noise reduction. Applications include signal pre-amplification, inter-stage isolation, signal level step up/down, and impedance matching. | The flexibility of Triad J Series transformers permits amplifiers to exceed broadcast standards. Although economy in construction places them in a lower price class, these units approach and closely approximate the performance characteristics of more costly hermetically sealed units. | The flexibility of Triad J Series transformers permits amplifiers to exceed broadcast standards. Although economy in construction places them in a lower price class, these units approach and closely approximate the performance characteristics of more costly hermetically sealed units. | The flexibility of Triad J Series transformers permits amplifiers to exceed broadcast standards. Although economy in construction places them in a lower price class, these units approach and closely approximate the performance characteristics of more costly hermetically sealed units. | |||||
| Maximum Input Level | 1 mW | 1 mW | 1 mW | 10 mW | 10 mW | |||||
| Primary Impedance | 50 Ohm250 Ohm600 Ohm | 150 Ohm600 Ohm | 225 Ohm900 Ohm | 50 Ohm250 Ohm600 Ohm | 150 Ohm600 Ohm | |||||
| Secondary Impedance | 85000 Ohm | 60000 Ohm | 60000 Ohm | 60000 Ohm | 60000 Ohm | |||||
| Direct Current (DC) for Primary Matching Impedance | ||||||||||
| DC Resistance (Primary) | 32.7 Ohm | 33.7 Ohm | 53.4 Ohm | 50 Ohm | 50 Ohm | |||||
| DC Resistance (Secondary) | 3450 Ohm | 4040 Ohm | 4178 Ohm | 5000 Ohm | 4920 Ohm | |||||
| Overall Turn Ratio | 1:12 | 1:10.16 | 1:8.7 | 1:10 | 1:10 | |||||
| Frequency Response at (±) 3 dB | 30 to 15000 | |||||||||
| RMS Test Voltage | 500 | |||||||||
| Case Type | J | |||||||||
| Connections | Leads | |||||||||
| Case Dimension (H) | 1-3/4 in | |||||||||
| Case Dimension (D) | 1-3/8 in | |||||||||
| Mounting Hole Diameter | 3/8 in | |||||||||
| Maximum Unit Weight | 0.35 lb | |||||||||
| Hum Reduction | 40 to 60 dB | 40 to 60 dB | 40 to 60 dB | 60 to 80 dB | 60 to 80 dB | |||||
| Transformer Contact Type | Center Tap Split Winding | Split Winding | Center Tap Split Winding | |||||||
| Applications |
Line or Mike to Grid |
Balanced Line or Mike to Single Grid |
Balanced Line or Mike to Single Grid | Line or Mike to Grid | Balanced Line or Mike to Grid | |||||
| Note |
Static Shield |
Static Shield |
Static Shield | Static Shield | Static Shield | |||||
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