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Power Amplifiers and Headphone Amplifiers

E.A.R. offers and extensive and award winning line of power amplifiers. From the budget-compatible 534 to the luxurious M100A mono blocks, there is something for everyone who craves the E.A.R. sound. And don’t forget about the versatile E.A.R. HP4 vacuum tube headphone amplifier. Think E.A.R. when it’s time to think about your next power amplifier.

Please read on to learn more about these exquisitely designed and built amplifiers.  For questions, please call 573-696-3551 or email  To order, please give us a call or visit our Online Store.

Vacuum Tube Power Amplifiers

E.A.R. 861

The E.A.R. power amplifier is a true push-pull design that operates in pure class A.  Subjectively it has the same “family” sound as the E.A.R. 859. Listeners will find it builds heavily upon this, with an increase in authority and attack. The lower bass has real grip and feel with this amplifier, far beyond its power rating, while the treble is smoother, cleaner, and sweeter, due primarily to the lack of overall feedback. A single word can sum up the 861: ''effortless.'' It has real power and control, the power to convey the emotion of the most demanding of recordings, whether the source is analog or digital.


  Vacuum Tube Selection- EL519 output tubes
  Power Output- 32 watts/ channel stereo bridgeable to 64 watts mono into 4, 8, or 16 Ohm
  Biasing- Self biasing
  Inputs- Both RCA and XLR
Retail Price:  $10,095.00
Please allow 4 to 6 weeks for delivery of this product.

E.A.R. 534

The E.A.R. 534 has been designed to meet a wide variety of needs, from the most demanding of audiophiles to the professional seeking high quality monitoring equipment in the studio. The circuit design features push-pull output and driver stages operating in pure class A, a high quality in-house designed output transformer, and low negative feedback. It is capable of operating in bridged-mono mode, to make a true mono block amplifier. Available with your choice of black or chrome faceplate.


  Vacuum Tube Selection- 2 x ECC83, 2 x ECC85, 8 x EL34
  Power Output- 50 watts/channel (24Hz - 15k Hz at 1% THD) bridgeable to 100
  watts mono into 4, 8, or 16 Ohm
  Power Consumption- 260 watts total
  Inter-modulation Distortion- Less than 1% at any level from 10mW to 50 watts
  Output Damping Factor- 18
  Power Bandwidth- 15 Hz - 40k Hz at less than 3% THD
  Input Sensitivity- 1V    
  Signal to Noise Ratio- 92dB
  Input Impedance- 47k Ohms
  Inputs- Both RCA and XLR
  Size- Width 16'' (405mm), Depth 16'' (405mm), Height 6'' (150mm)
  Weight - 20kg
Retail Price: $6795.00 Please specify black or chrome faceplate when ordering.
Please allow 4 to 6 weeks for delivery of this product.

E.A.R. 890

The E.A.R. 890 vacuum tube amplifier builds on the original circuit design of the venerable 834 integrated amplifier, but offers more power by way of the KT90 vacuum tube.  Build quality and finish are to E.A.R.'s usual high standards, with a distinctive touch of luxury in the thick brass front panel, heavily chromed and polished to a mirror finish. Reliability is assured and there are no user adjustments.


  Vacuum Tube Selection- KT90 output tubes
  Power Output- 70 watts/channel bridgeable to 140 watts mono into 4, 8, or 16 Ohm
  Biasing- Self-biasing
  Inputs- Both RCA and XLR
Retail Price:  $8295.00
Please allow 4 to 6 weeks for delivery of this product.

E.A.R. 509

The E.A.R. 509 Mono Block Amplifier is built to professional standards using advanced industrial grade, high capacity valves not used in domestic power amplifiers.  No feedback is used on the transformer secondary, and the 509 is stable into any loudspeaker load.  Features convenient self-biasing of the vacuum tubes.


  Power Output- 100 watts (20 Hz - 20k Hz at <0.25% THD into rated load)
  Power Consumption 180 VA
  Inter-modulation Distortion- Less than 1% at any level from 100mW-100 watts
  Output Damping Factor- 20
  Power Bandwidth - 12 Hz – 60k Hz, -3dB, 0.5% THD
  Input Sensitivity (Unbalanced)- 1.2V
  Signal to Noise Ratio- 96dB
  Input Impedance (Unbalanced)- 25k Ohm
  Size Each- Width 12'' (30cm) x Depth 10'' (25.4cm) x Height 6'' (15cm)
  Weight- 18kg
Retail Price per Pair:  $15,000.00 with RCA Inputs, $16,000 with XLR Inputs.  Please specify.
Please allow 4 to 6 weeks for delivery of this product.

Vacuum Tube Headphone Amplifiers

E.A.R. HP4

The HP4 is arguably the world's finest headphone amplifier designed for use with the highest quality dynamic headphones.  The HP4 uses 6SL7 valves, properly matched to the load through Tim de Paravicini's renowned transformers, to deliver nearly 1W of high quality, low distortion power into high or low impedance headphones. The output circuit configuration uses the “Enhanced Triode Mode” while the input is also transformer coupled, giving the flexibility to accept balanced or unbalanced signals from the preamplifier.

The HP4 has its own volume control, while input signals can be independently switched through to the power amplifier for either headphone or loudspeaker listening. As with all E.A.R. products, reliability is paramount and valve life is expected to be in excess of 10,000 hours.

The E.A.R. HP4 has facilities for up to five line inputs, and offers a genuine tape monitoring circuit, making a total of six inputs. A high quality volume control is fitted, as well as a panel mounted power switch. Input and output terminals are gold plated.  Accommodates up to 4 pairs of headphones.


  Vacuum Tube Selection- 6SL7
  Power Output- <1 Watt
  Outputs- 2 pair high impedance, 2 pair low impedance, 1 pair tape monitoring
  Inputs- 2 pair, both single ended and balanced
  Controls- On/off for headphone outputs and mute for amplifier
Retail Price:  $5895.00
Please allow 4 to 6 weeks for delivery of this product.

Osage Audio Products, LLC ∙ P.O. Box 232 ∙ Hallsville, MO  65255
  573-696-3551 ∙
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