For Sale Jeff Rowland 625 Power Amplifier

Further Information

Hi, I’m selling my Jeff Rowland 625 Power Amplifier with original box and packaging.

l am the second owner of this amplifier and have owned it for approximately 5 years. It is Australian stock.

This is a wonderful sounding amp and build quality is superb. I have owned various integrated amplifiers from Vitus, Dartzeel and others but it is the JR that l have kept the longest, a beautiful sweet sound with plenty of power to drive previous speakers from Magico S5’s , Avalon “Eidelon “and currently Audio Solution “Virtuoso” with ease!

l am including a voodoo adapter for 15 -20 amp if needed.

I pair it with the latest pre from JR the Capri S2-SC fitted with HP phono card. I will be listing this at a later date but if anyone is interested in buying both please contact me.

These amplifiers are rarely seen on the s/h market.

*This is the mk 1 version. Thanks

Any questions welcome.

Model 625 Features

Machined Aluminum Chassis
Precision-machined chassis with integrated heatsinks, milled from a solid block of aircraft-grade 6061-T6 aluminum, provides exceptional thermal heat transfer/dissipation, RFI/EMI shielding, and resonance control.

Composite Circuit Architecture
Unique composite circuit architecture incorporating separate Class AB voltage and current gain blocks with no overall negative feedback, delivers a sensuous grain-free musicality of unparalleled transparency and low-level resolution.

Balanced Topology
Inherent cancellation effects of balanced topology implemented throughout all power and input/output circuits ensures greatly reduced distortion and noise under dynamic signal conditions.

High Current Copper Bus-bars
High current, dual polarity, ultra low impedance copper bus-bars distrubute both power supply input current and signal output current, virtually eliminating intra-circuit EMI signal contamination, greatly reducing internal wiring, while increasing circuit board rigidity.

High-Precision Surface Mount Components
Extensive use of Lead (Pb)-free, low temperature coefficient, active and passive surface-mount components results in significantly smaller loop areas, reduced circuit capacitance and inductance, and introduces less noise than conventional leaded components.

Transformer-Coupling and Isolation
Transformer coupled input circuitry provides universal component compatibility and virtually eliminate ground loop noise and RFI/EMI. Transformer coupling ensures identical amplifier overall gain when using unbalanced input adapters.

Power Factor Correction
Power Factor Correction (PFC) in the power supply reduces AC line harmonic noise pollution and increases AC line power utilization to 99%.

High-Efficiency Switch-Mode Power Supply
Highly efficient, compact, lightweight, 1500 watt DC switch-mode power supply provides optimum voltage regulation for all circuits and operating conditions, and allows for quiet operation over a wide range of AC mains power sources.

Dual-Position Speaker Terminals
Dual CE approved speaker output terminals, in both horizontal and vertical orientation, require no tools for secure, low resistance connections, and allow for easy bi-wiring applications.

Flexible 20 amp AC Power
20 amp AC power inlet accepts a wide variety of after-market high-performance power cables.

Front Panel Standby Button
Illuminated front panel push-button switches the amplifier into standby mode (< 1 watt consumption).

Rear Panel Remote Jack
12V 3.5mm jack on rear panel permits amplifier power on/standby switching in remote and home theater applications.

Self-Leveling Supports
Removable 3-point self-leveling Delron chassis supports provide high frequency mechanical noise isolation.

Model 625 Technical Specifications

Stereo power amp

Output Power
300 watts @ 8 ohms
550 watts @ 4 ohms

Frequency Response
5 Hz – 350 kHz

S/N Ratio
95 dB, ref. 1.0 watt @ 8 ohm load

Output Noise
< 55 ìv, 20 Hz – 20 kHz, unweighted

Crosstalk
> 91 dB @ 1 kHz, 74 dB @ 20 kHz

Input Impedance
10k ohms

THD + Noise
0.005% @ 1 kHz, 8 ohms

Damping Factor
> 200, 20 Hz – 20 kHz

Overall Gain (Balanced or Unbalanced)
27 dB

Common Mode Rejection Ratio
> 90 dB, 20 Hz – 20 kHz

Absolute Phase
Non-inverting Pin 2 Positive

Inputs
1 pair balanced (XLR)

Outputs
2 pair parallel binding posts per channel

Power Consumption
Idle 100 watts
Standby 1 watt

Amplifier Weight
54 lbs. / 24.5 kg

Amplifier Shipping Weight
64 lbs. / 29 kg

Overall Amplifier Dimensions (h/w/d)
5.75” x 15.5” x 16.25” / 146mm x 394mm x 413mm