Jump to content

Sign in to follow this  
Audio Connection

Jeff Rowland Coherence One Preamplifier

Recommended Posts

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. 

 

Specifications

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

 

jr.jpg

jr2.jpg

jr3.jpg

6Mf%p8m3S%2qZr1GJbq9NQ_thumb_44a3.jpg

UNADJUSTEDNONRAW_thumb_4498.jpg

E89nLspfS5yfdJkRSr1guQ_thumb_449a.jpg

Edited by Audio Connection

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Classifieds Statistics


    Currently Active Ads

    Total Sales (Since 2018)

    Total Sales Value (Last 14 Days)

    Total Ads Value (Since March 2020)
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...