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Audio Connection

Jeff Rowland Coherence One Preamplifier

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Posted (edited)
Item Condition: As Traded
Shipping Options: Pickup available and you can audition.
Suburb or Town: Leichhardt
State: New South Wales
Payment Method: Cash on Pickup, EFT
Reason for selling:

Further information: 

Up for sale is two box preamp from Rowland Research. This preamplifier has technical innovation with unmatched beauty and ergonomics back in the day and still considered to be very sort after by many audiophiles. It has advanced in field effect transistor technology and research into low-level signal recognition and resolution have positioned the Coherence One preamplifier as a standard by which other units will be compared. Powered by a companion power supply which eliminates the possibility of hum field contamination in the low-level circuitry. In addition, extra care was spent on overall power supply design due to the understanding that an audio amplifier is simply a modulated power supply. 


This unit has a MM/MC phono preamp built in. 



Phono Section: RIAA Deviation:  20 Hz - 20 kHz ±0,15 dB

Input Impedance:  0 to 100 Ω, user adj. 47 k Ω for MM

Equiv. Input Noise:  less that 1 nanovolt per square root Hz

Gain:  40 dB MM at 1 kHz, 60 dB MC at 1 kHz

Line Section: Frequency Response:  0,2 Hz to 500 kHz -3 dB

Input Impedance:  10k Ω

Output Impedance:  100 Ω

Gain:  20 dB

Distortion:  less that 0,05% THD or IM below rated output

Signal-to-Noise ratio:  greater than 92 dB A referred to rated output

Rated Output:  5 volts RMS

Power Supply: Transformer:  30 VA encapsulated toroidal

Capacity:  10,000 microfarads total








Edited by Audio Connection

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