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Monday, September 14, 2015

Linestage Output Transformer

Can you do linestage output transformer? I've seen a lot of publications about output transformers but I've not seen you said something about linestage output transformer, or preamp output transformers, one customer asked.

Of course we do! And here's the reward for asking that question! This customer requested a 8K:600 linestage output transformer for his 5842 simple preamp, running at ~25mA at 130V B+. 

Level 3 Nanocrystalline Double C Core Linestage Output Transformer
  • In circuit measurement
    • 600 Ohm load: 20Hz (-0.38dB) - 1kHz (0dB/ref) - 20kHz (-0.16dB)
    • 100K Ohm load: 20Hz (-0.54dB) - 1kHz (0dB/ref) - 20kHz (-0.09dB)
  • Primary DCR: 390.4 Ohm, 391.1 Ohm (B-P, at 22 degC)
  • Secondary DCR: 30.4 Ohm, 30.4 Ohm (600-common)
  • Primary inductance: 48.5H, 49H (DC bias at 25mA, 20Hz, 5Vrms)
    • Lower bias current will yield higher primary inductance (68H at 0 DC). 
  • Max. primary current: 30mA (recommended <=25mA)
 5Hz - 85kHz +/-3dB
FFT with difficult load (SS amp)
5Hz - 100kHz +/- 3dB

FFT with easy load (tube amp)

J&K Audio Design
14/9/2015

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* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.  
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Level 0: link 1

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Level 3: depends on type, size and complexity. Email us for details.

Iso-trans: link 1, link 2

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* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.

* Our product lines are always improving and increasing. If you do not see what you want, contact us!

* Please email for volume discounts, distributor and OEM pricing.

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