Conrad Johnson PV10A All Tube Preamp with Phono Input

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We receive C-J preamps from time-to-time but they're usually just line stage variety that lacks a phono input to connect your turntable.

Whenever we list one with phono capability we receive lots of calls and emails even *after* it's sold!

Just serviced and ready to please for another 30 years. In overall very good cosmetic condition with little signs of use.

Includes a solid built-in phono stage which is always desirable for fans of the brand.

SkyFi Service Notes:
• Tested and replaced all three phono stage tubes
• Cleaned and tested controls
• All inputs and outputs checked and passed testing
• Listening Test review and pass

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - Phono Interconnects

More from Conrad-Johnson:
The PV10 drew on the technology of conrad-johnson’s path-breaking Premier Seven to achieve musical performance beyond its modest price.

Both the phono and line stages are zero feedback design. The phono section uses two triode amplifiers separated by a passive RIAA equalization network.

The PV10A revision featured a new line stage circuit based on two 12AU7s. A bit more than a year after the introduction of the PV10A, a line-stage only version was offered — the PV10AL. There have been three variants of the PV10A and AL. The first had the same control set as the PV10, as listed below. The second used a new balance control, with a detented center position that was out of the circuit. The balance enable/disable switch was deleted. The final version of the PV10A and AL deleted the balance control. Aside from these changes, and associated cosmetic revisions, the three versions are all identical in circuitry.

Features:
• Inputs/Outputs
• Phono
• Tuner
• CD
• Video
• Auxiliary
• One Tape input with monitor and recording facilities
• One main output
• Auto-muting to suppress warm-up transients

Controls:
• Selector
• Source/Monitor
• Balance (deleted in last version of PV10A and AL)
• Balance In/Out (deleted in later versions of PV10A and AL)
• Volume
• Power

Specifications:
• Gain: Phono Stage 48.5 dB (phono overload 125 mV at 1kHz)
• 31.5 dB (18 dB for PV10A and PV10AL)
• Distortion: less than .1% THD or IMD
• Response: bandpass 2Hz to more than 100kHz
• RIAA Equalization: +/- .25 dB (20 to 20 kHz)
• S/N Ratio: Phono Stage 72 dB below 10 mv input
• Line Stage 84 dB below 2.5 volt output
• Phase: Line Stage phase inverting, Phono Stage phase correct

Mechanical:
• 16″ X 3″ x 11″

Conrad Johnson PV10A All Tube Preamp with Phono Input - Owner's Manual

The SkyFi Testing Process for Preamplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. Special attention is paid to the power supply which is the most common source of failure for preamps. We then power up the unit and run a simple 1k sine wave while monitoring the low voltage output on an oscilloscope for signs of distortion or noise to get a baseline.

At this point we will lubricate and clean all switches and potentiometers (that are not sealed) with a high quality contact cleaner, and then re-test all functions for any signs of noise or scratching.

Final testing involves putting actual music through the preamplifier We have learned over time that some issues are only noticeable to a trained ear while listening to a familiar source material. Our test bench has reference vintage KEF speakers that we are super familiar with which will quickly reveal any discrepancies. Some preamps will then move into the listening room where they will be tested with our in-house reference system.