Jeff Rowland Cadence Phono Preamplifier - W/ Rare power supply

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General:
The Cadence phono preamp from Jeff Rowland is an incredible piece by itself, but even better, we have its matching optional power supply. The power supply even has its original plastic on the front.

In typical Jeff Rowland fashion these two pieces are finished to a very high degree with the best materials and components possible. Both units are quite heavy. The finish truly looks great in the light.

Included with be its original box, manual, and a set of Cardas XLR to RCA adapters. Also included will be two different length power cables for linking the two chassis.

SkyFi Cosmetic Notes:
The original box is included with this unit but some of the original internal packaging is no original.

SkyFi Technical Notes:
A set of Cardas adapters are included to adapt the XLR inputs and outputs for use with single ended turntables and preamps. There are also two power supply cables included. One is the original short cord. The second is a longer Cardas cable which allows the power supply to be separated from the phono stage a bit more.

Ownership:
Single Owner

Connections:
XLR, DIN Power Supply connections, Ground Post

General Sound:
Big beautiful musical sound with little fatigue.

Cosmetic Condition:
8/10 = Very Good. Excellent front faceplate, one minor flaw on chassis side or top. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab and listening room.

Included:
Exactly as pictured and described above.

Packing:
Original Manufacturers Packing

Specs:
Gain: selectable 64 or 74dB
RIAA accuracy: 20Hz to 20kHz
Frequency response: 0.5Hz to 180kHz
Common mode rejection ratio: 130dB
THD: <0.015%
Output noise: <59mV (low gain), <60mV (high gain)
Cartridge loading: 30, 50, 250 or 400 ohms
Connections: balanced XLR, unbalanced XLR (RCA adaptors included)

Dimensions:
Preamp: 44.5cm x 13cm x 8cm Power Supply: 44.5cm x 12cm x 4.25cm

Weight:
45 lbs.

Recommended Cables:

Kimber Kable - BALANCED XLR Connectors - Better

Kimber Kable - BALANCED XLR Connectors - Best

Kimber Kable - Power Cords - Better

Kimber Kable - Power Cords - Best

Testing Process:
We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

When we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface.

The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1 KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope.

We then switch to a 1 KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment.

Once the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and/or outputs these are tested as well.

We finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected.

If the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.