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.




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32.7 Ohm Primary DC Resistance J Series Audio Transformer

32.7 Ohm Primary DC Resistance J Series Audio Transformer
33.7 Ohm Primary DC Resistance J Series Audio Transformer

33.7 Ohm Primary DC Resistance J Series Audio Transformer
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53.4 Ohm Primary DC Resistance J Series Audio Transformer
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50 Ohm Primary DC Resistance J Series Audio Transformer
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50 Ohm Primary DC Resistance J Series Audio Transformer
Description N/A 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. N/A 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. N/A 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. N/A 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. N/A 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 N/A 1 mW N/A 1 mW N/A 1 mW N/A 10 mW N/A 10 mW
Primary Impedance N/A 50 Ohm250 Ohm600 Ohm N/A 150 Ohm600 Ohm N/A 225 Ohm900 Ohm N/A 50 Ohm250 Ohm600 Ohm N/A 150 Ohm600 Ohm
Secondary Impedance N/A 85000 Ohm N/A 60000 Ohm N/A 60000 Ohm N/A 60000 Ohm N/A 60000 Ohm
Direct Current (DC) for Primary Matching Impedance N/A
DC Resistance (Primary) N/A 32.7 Ohm N/A 33.7 Ohm N/A 53.4 Ohm N/A 50 Ohm N/A 50 Ohm
DC Resistance (Secondary) N/A 3450 Ohm N/A 4040 Ohm N/A 4178 Ohm N/A 5000 Ohm N/A 4920 Ohm
Overall Turn Ratio N/A 1:12 N/A 1:10.16 N/A 1:8.7 N/A 1:10 N/A 1:10
Frequency Response at (±) 3 dB N/A 30 to 15000
RMS Test Voltage N/A 500
Case Type N/A J
Connections N/A Leads
Case Dimension (H) N/A 1-3/4 in
Case Dimension (D) N/A 1-3/8 in
Mounting Hole Diameter N/A 3/8 in
Maximum Unit Weight N/A 0.35 lb
Hum Reduction N/A 40 to 60 dB N/A 40 to 60 dB N/A 40 to 60 dB N/A 60 to 80 dB N/A 60 to 80 dB
Transformer Contact Type N/A N/A Center Tap Split Winding N/A Split Winding N/A N/A Center Tap Split Winding
Applications N/A

Line or Mike to Grid

 		N/A

Balanced Line or Mike to Single Grid

 		N/A Balanced Line or Mike to Single Grid N/A Line or Mike to Grid N/A Balanced Line or Mike to Grid
Note N/A

Static Shield

 		N/A

Static Shield

 		N/A Static Shield N/A Static Shield N/A Static Shield
Features N/A
  • Low level high fidelity.
  • Single-hole mounting, allowing rotation for maximum hum reduction.
  • Alloy shielding gives 40 to 60 dB hum reduction.
  • Wide frequency ranges.
  • Flexible leads for ease of mounting.
  • Input units electrostatically and magnetically shielded .
  • Lightweight.
  • Smooth, baked enamel cases, 1-3/8" diameter, 1-3/4" above chassis .
  • Legible circuit diagrams permanently affixed to every case.
 		N/A
  • Low level high fidelity.
  • Single-hole mounting, allowing rotation for maximum hum reduction.
  • Alloy shielding gives 40 to 60 dB hum reduction.
  • Wide frequency ranges.
  • Flexible leads for ease of mounting.
  • Input units electrostatically and magnetically shielded .
  • Lightweight.
  • Smooth, baked enamel cases, 1-3/8" diameter, 1-3/4" above chassis .
  • Legible circuit diagrams permanently affixed to every case.
 		N/A
  • Low level high fidelity.
  • Single-hole mounting, allowing rotation for maximum hum reduction.
  • Alloy shielding gives 40 to 60 dB hum reduction.
  • Wide frequency ranges.
  • Flexible leads for ease of mounting.
  • Input units electrostatically and magnetically shielded .
  • Lightweight.
  • Smooth, baked enamel cases, 1-3/8" diameter, 1-3/4" above chassis .
  • Legible circuit diagrams permanently affixed to every case.
 		N/A
  • Low level high fidelity.
  • Single-hole mounting, allowing rotation for maximum hum reduction.
  • Alloy shielding gives 60 to 80 dB hum reduction.
  • Wide frequency ranges.
  • Flexible leads for ease of mounting.
  • Input units electrostatically and magnetically shielded .
  • Lightweight.
  • Smooth, baked enamel cases, 1-3/8" diameter, 1-3/4" above chassis .
  • Legible circuit diagrams permanently affixed to every case.
 		N/A
  • Low level high fidelity.
  • Single-hole mounting, allowing rotation for maximum hum reduction.
  • Alloy shielding gives 60 to 80 dB hum reduction.
  • Wide frequency ranges.
  • Flexible leads for ease of mounting.
  • Input units electrostatically and magnetically shielded .
  • Lightweight.
  • Smooth, baked enamel cases, 1-3/8" diameter, 1-3/4" above chassis .
  • Legible circuit diagrams permanently affixed to every case.