AVA Ultravalve Vacuum Tube Amplifier
Best tube amplifier for audiophiles seeking classic warmth on a budget.
The AVA Ultravalve Vacuum Tube Amplifier offers exceptional value and performance, delivering a resolving, classic sound. Based on a modified Dynaco Stereo 70 design, it utilizes 6CA7 output tubes and readily available small-signal tubes. Frank Van Alstine's extensive experience is evident in its refined circuit, providing impressive bass control, dynamics, and a spacious soundstage. Despite its modest price, the Ultravalve competes with much more expensive amplifiers, making it a highly rewarding choice for both modest and high-end systems. It's an amplifier that rewards careful listening and delivers a captivating audio experience.
$1999.00
Owner Satisfaction
4.5
/ 5
Category Rank
1157
/ 1687
#1157 in Power Amplifiers
Price vs Category Average
-76%
Below average
Dimensions
Not specified
/ Not specified
Who it's for
- Audiophiles seeking classic, rich, and organic vacuum tube sound
- Listeners prioritizing emotional connection and natural musical flow
- Value-conscious buyers looking for reliable, upgradeable high-end audio gear
Who should skip it
- Users wanting a low-maintenance, set-and-forget audio system
- Owners with limited ventilation or small, temperature-sensitive listening rooms
- Listeners using inefficient speakers requiring high-wattage solid-state power
Performance breakdown
Sonic Resolution
Modern circuit refinements extract impressive detail from classic vacuum tube topology.
Low-End Authority
Delivers surprisingly tight and controlled bass for a tube-based design.
Soundstage Imaging
Creates a spacious and immersive environment that belies its modest footprint.
Maintenance Ease
Utilizes readily available tubes to minimize the headache of sourcing replacements.
Build Integrity
Point-to-point wiring and polished stainless steel ensure long-term structural reliability.
System Versatility
Flexible output taps and ground switching accommodate a wide range of speakers.
Key Specs
Dimensions
Not specified
Weight
Not specified
MSRP
$1,999
Features
- Classic vacuum tube sound with modern resolution
- Exceptional bass control and dynamics for its class
- Quietly refined design based on proven topology
- Uses readily available small-signal tubes, reducing the need for tube rolling
- Point-to-point wiring for signal paths
- Ground float switch for system flexibility
- Impressive performance that belies its price point
- Awarded Exceptional Value
- 35 watts per channel output power
- Tube Complement: 2 x 6CA7 (or EL34, KT77), 1 x 5AR4 rectifier, 2 x 6GH8A small-signal tubes
- Speaker Outputs: 4-, 8-, and 16-ohm binding posts
- Chassis Material: Polished stainless steel
- Ground Switch: Yes, on rear panel
What customers say
Customers consistently praise the AVA Ultravalve Vacuum Tube Amplifier for its exceptional sound quality, often describing it as warm, detailed, and immersive. Many highlight its ability to bring new life to their music collections, creating a rich listening experience. Users also appreciate the amplifier's robust build and long term reliability, noting its solid construction and consistent performance over time. This combination of superior audio performance and dependable craftsmanship makes it a highly regarded choice among enthusiasts seeking a premium listening experience.
Know before you buy
With 35 watts per channel, this amplifier performs best with speakers of average to high sensitivity. It is well-suited for most bookshelf and floor-standing speakers in a typical listening room, though it may struggle to drive very inefficient, low-impedance designs to high volumes.
The design is optimized for reliability and ease of use, utilizing readily available small-signal tubes. While you can experiment, the amplifier is engineered to perform exceptionally well with standard, accessible tubes, sparing you the need for constant searching or expensive replacements.
The Ultravalve provides the warmth and harmonic richness characteristic of vacuum tubes, but with the tighter bass control and resolution typically associated with modern solid-state designs. It avoids the overly soft or 'syrupy' sound of some vintage tube gear, offering a more balanced and transparent presentation.
The ground float switch is a practical feature designed to help eliminate ground loop hum, which can occur when connecting multiple components in your audio system. If you experience a low-frequency buzz, toggling this switch can often resolve the issue without needing external ground loop isolators.
Point-to-point wiring is a hallmark of high-end audio construction that minimizes signal path interference and improves long-term durability. It allows for a cleaner, more direct signal flow, which contributes to the amplifier's refined soundstage and overall clarity.
Yes, the Ultravalve is compatible with 6CA7, EL34, and KT77 output tubes. This flexibility allows you to fine-tune the sonic character of the amplifier to better match your specific speakers or personal listening preferences.
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$1999