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<<PCB ONLY. No components included. Assembly required.>>

Discrete transformer-balanced mic and instrument preamplifier for 500 series racks. With the high fidelity yet vintage tone of Deane Jensen's 918 discrete op amp at the heart and your choice of transformers (Jensen, Cinemag, Lundahl) in the signal path, the 818 provides the clean and thick sound you need to make the best recordings possible. The unbalanced input automatically switches to a D.I. circuit and runs the signal through a third transformer (the aforementioned brands or Pikatron) allowing direct recordings for guitar, bass, synth or drum machine.  A total of 3 transformers in the signal path makes the 818 the ultimate preamp for instrument tracking. An output fader allows you to drive the transistors and transformers harder for saturated tone while maintaining optimal recording level.

 

I initially made this mic pre for myself because I found some vintage Pacific Recorders 918 blocks with a huge non-2520 footprint. Referencing Jensen's original 918 documentation as well as the 990 application notes, I added multiple input and output transformer manufacturer options, mic input circuitry and a DI. I dug how it sounded and because I only had 2 of those vintage 918's I decided to ditch its huge footprint for the modern ones and to clear up some space for some nicer extras.

 

Relay-activated “PHD”

  • 48v Phantom
  • 20dB Pad
  • Polarity reversal

 

Auto-switching Transformer D.I. (unbalanced only)

  • Jensen JT-DB-EPC
  • Cinemag DBX
  • Lundahl LL1935
  • Pikatron UP3096M
  •  

Input Transformers

  • Jensen JT-16PCjr
  • Cinemag CMMI-2C
  • Lundahl LL1570

 

Output Transformers

  • Jensen JT-11E Series
  • Cinemag CMOB-3 or CMOQ-3
  • Lundahl LL1517
  • optional snap-in THAT 1646 PCB for transformerless out

 

Discrete Op Amps

  • gar918 (from CAPI)
  • http://capi-gear.com/catalog/product_info.php?cPath=71_72&products_id=527
  • BLU-18 (from DIY Recording Equipment)
  • https://www.diyrecordingequipment.com/collections/parts/products/blu-18-discrete-opamp-kit

 

The 818 name is a slight nod to the 918 and an homage to the area code where Jensen Transformers was and continues to be headquartered (and Cinemag too) – the San Fernando Valley in California, the Silicon State.

818 Mic Preamp for 500 Series (PCB only)

$15.00Price