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868L / 868P Pre Amp

868L / 868P Pre-Amp
 
The EAR 868 is a transformer-coupled linestage and phono preamplifier that employs two pairs of the somewhat unusual 7DJ8 tube (PCC88) instead of the ubiquitous 6DJ8 (which can be directly substituted). According to the 868’s page on the website of Audio Revelation, a longtime EAR dealer in Carlsbad, California, the linestage gain is 17dB, the phono gain a variable 50-80dB, and the output impedance a relatively low 600 ohms. The 868 doesn’t invert phase. Also, rather than using another set of tubes for a third gain stage in the phono section with its attendant risk of noise, EAR’s legendary designer, Tim de Paravicini, chose to handle that with custom-designed step-up transformers, with selectable primaries of 10/1, 20/1, and 30/1. The settings are determined by a DIP switch inside the chassis, toward the rear: As you change the gain, the internal impedances also change, to 50, 125, and 500 ohms, respectively. 
 
Specification
  • Inputs - 1 x phono 5 x line level unbalanced (RCA phon
  • Tape Out - 1 x tape monitor
  • Output - 2 sets Balanced XLR 2 sets Unbalanced RCA Pho
  • Line Amp - S/Noise Line Amp = 90dB (1v out ref)
  • Phono section - Noise (weighted) = -80dB (IHF)
  • Input Impedance - Phono 47k ohms MC input40 ohms(as standard t
  • Maximum Output - 5V into 600 ohms(Both balanced & unbalanced o
  • Power Consumption - 24 W max total
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