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ModWright Instruments Analog Bridge
The Analog Bridge
The Analog Bridge was designed to fill a niche left by our custom tube modifications for digital source equipment. Due to the rapidly changing world of modern digital, we wanted a product that could be used with a variety of digital and analog SS sources. The Analog Bridge will not be replaced as digital technology progresses and system components change. It is an accessory that will be a constant and improvement in your system.
The purpose of the Analog Bridge, is to add the strengths and positive attributes of tubes to any system, without the bandwidth limitation, noise and added distortion that many associate with tube electronics.
The Beginning of Something Greater
For many, the Analog Bridge is the first step into the ModWright approach to system design.
It is designed to deliver an immediate improvement—without compromise.
But it is also designed with something more in mind.
As your system evolves, the benefits of the Analog Bridge scale with it—revealing more with every upgrade downstream.
Many customers who begin here go on to explore:
- Dedicated phono stages
- Tube line stages
- Power amplification
Not because they need to—but because they now hear what is possible.
The Analog Bridge does not define the system. It reveals what the system can become.
Where This Fits in Your System
Every ModWright product is designed as part of a greater whole.
A typical system progression:
- Analog Bridge – Enhances musicality and engagement at any level
- PH 9.0XT / Line Stage – Reveals deeper detail, space, and tonal richness
- KWA Amplification – Provides control, authority, and realism
Each step builds on the last—bringing you closer to a system that disappears, leaving only the music.
Analog Bridge Uses & Sonic Benefits
1. Between digital or analog source(s) and preamp. – Any digital that is deemed thin, bright or lacking depth and body will definitely benefit. Even digital that is not bright, but lacks body, will benefit from tube body and weight.
2. Between preamp and amp. – An all SS system that customer feels is lacking in body, depth or warmth. Perhaps system is very resolving but uninvolving. The Analog Bridge will bring 3-dimensionality and broad soundstage to the system.
3. Between source and amp. – A simple system one or two sources (with integral volume control) and amp is ideal. It adds the sonic benefits of tubes while keeping the system simple. Very low output impedance means it will drive ANY amp.
4. Between passive attenuator and amp. – Same as above, source(s) – passive pre/attenuator – Analog Bridge – Amp. Analog bridge provides necessary buffering not provided by a passive.
Product Advantages
1. SYSTEM USE – The Analog Bridge can be added to any system and allows customers numerous ways to improve and tailor their sound. Most importantly, it has very low noise, distortion, and wide bandwidth. It does not add undue coloration or take away anything from the signal path.
2. PURELY ANALOG – There are no integrated circuits, clocks, or other processors. This is a purely analog product. We chose toggle switches for this reason.
3. SOLID STATE & TUBE SYSTEMS – It is intended for use in an all-solid-state system that wants to add tubes. It ideally goes before the amp, because it offers exceptionally low output impedance which means it will interface with any amp very well! It can go in any system with tubes also. In this case, it would ideally follow a digital or analog source that is SS. The signal in a system starts with the source and even if there is a tube system that follows, the improved source signal will benefit the whole system.
4. ON-THE-FLY & 3 DIFFERENT TUBE TYPES – The Analog Bridge features two parallel output tube stages, that can be switched on-the-fly, via a toggle on the faceplate. One is 6922/6dj8/7308 and the other is 6SN7 based. Each tube type has its own tonal characteristics and rolling tubes by other manufacturers also allows for a change in sound. This circuit uses three different tube types: GZ34 rectifier and 6922 or 6SN7 driver tubes. The Analog Bridge is tube rectified and SS regulated, to allow rectifier tube rolling as a way of changing tonal characteristics of the Analog Bridge. SS voltage regulation is chosen for the best regulation and lowest noise and distortion possible. Tubes are exposed for easy access and tube rolling. Brief mute circuit is designed into the switching between tubes to prevent any DC issues.
5. COLOR SELECTION – The Analog Bridge comes in two color options. The chassis will always be black, but the faceplate can be changed to black or silver for system matching.
6. TUBE DISCOUNT – The Analog Bridge comes in two versions, RCA or XLR for balanced systems. We know that many customers already have collections of all three of the tubes used in the Analog Bridge. As you are aware, tubes are much more costly now. Because of this, we will give customers, the option of receiving the unit without stock tubes, at an appropriate additional discount due to the cost savings of not shipping with stock tubes. Customers can choose which tubes they want included in their purchase. If you choose not to include certain tube types with your purchase, the discount will be as follows: 6922: $50 Discount if not included. 6SN7: $50 Discount if not included. GZ34: $25 Discount if not included.
Tube Benefits
JJ GZ34 Rectifier Tubes:
- The rectifier tube can be changed to 5AR4, GZ34, 5R4GY, 274B, 5U4, 5U4G, 5U4GB, 5V4, 5V4G, 5V4GB. Virtually any rectifier tube can be used, provided it is pin compatible with those listed.
- The filament winding is rated for 3A. The supply circuit is designed to meet the requirements of any rectifiers' tube data.
- There is enough headroom in the voltage regulator to allow for rectifier tubes with different levels of forward voltage drop.
- All rectifier tubes sound different. Some have tighter bass, others more bloom, some are warmer while others are faster.
JJ 6922 Output Tubes:
- The 6922 output tubes can be changed to 6DJ8, 7DJ8, 7308, ECC88. Many NOS options available.
- 6922 and compatible tubes are more neutral and detailed, which will suit some tastes and music better than the 6SN7.
JJ 6SN7 Output Tubes:
- The 6SN7 output tubes can be changed to CV181. Many NOS options are available for the 6SN7.
- The 6SN7 has a 'fat tone' and warmth, compared to the 6922 and as such, will suit some tastes and music better than the 6922.
Three Tubes That Can Be Changed:
- This allows for a myriad of different sonic combinations to suit any customers sonic preferences for all music.
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Professional Reviews 82/100
Nicely Roasted
Sound Quality
82/100
Build Quality
80/100
Features Usability
80/100
Value for Money
85/100
The Analog Bridge brings tube warmth, body and convincing three-dimensionality to leaner solid-state systems without sacrificing a quiet background. HiFi Huff found its switchable 6SN7 and 6922 voicings especially persuasive: choose rich, juicy weight or a sharper, airier, more animated presentation. Compact, flexible and purpose-built for system tuning, it makes music feel more involving.
What Reviewers Are Saying
Pros
Adds warmth, fullness, body and three-dimensionality while remaining free of audible hum, buzzing and interference.
Switchable tube types offer useful voicing flexibility: 6SN7 for richer, warmer weight and 6922 for a more detailed, airy and lively sound.
Optional XLR connectivity and bypass support easy integration into both RCA and balanced line-level systems.
&
Cons
Its intentional tube voicing is not strictly neutral, and the warmer 6SN7 setting can sound darker than the unprocessed signal.
It is a line-level system-tuning component, not a headphone amplifier or a standalone source component.
SOUND QUALITY PERFORMANCE 82/100
The review finds the Analog Bridge notably quiet and free of audible interference, while its tube choices let owners tailor the presentation from warm and rich to more open and detailed. Its audible contribution is intentional rather than strictly neutral, and it is a line-level component rather than a headphone-driving amplifier.
Transparency Resolution
86/100
HiFi Huff says the unit introduced no negative artifacts and could seem effectively invisible in the system. With 6922 tubes, the reviewer also heard a sharper, more detailed and airier presentation, though the device is designed to add tube character rather than preserve an entirely unchanged signal.
Tonal Balance Musicality
93/100
The 6SN7 option was praised for adding warmth, body, juiciness and a stronger emotional connection to music. Switching to 6922s brought a more lively and airy sound, giving the Analog Bridge useful tonal flexibility without the reviewer finding either presentation unpleasant.
Dynamics
88/100
The reviewer describes the 6922 presentation as more exciting and more alive, with greater three-dimensionality than the system without the Bridge. There is little direct discussion of large-scale transient impact or headroom, so the evidence is strongest for a livelier sense of musical expression.
Noise Floor
94/100
HiFi Huff explicitly reports no noise, hum, buzzing or interference after inserting the Analog Bridge into the system. That very quiet behavior supports its intended role as a line-level tube stage, although the review does not test it with sensitive headphones or IEMs.
Headphone Compatibility
50/100
The Analog Bridge has line-level RCA and optional XLR connections, but no headphone output or stated headphone-driving function. The review assesses it between source and amplification components rather than with headphones of varying impedance or sensitivity.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
80/100
The reviewer notes that ModWright products are handcrafted in the United States and speaks positively of the company’s longstanding reputation. There is little direct comment on the Bridge’s chassis execution, controls, connectors or long-term durability.
Features Usability
80/100
It provides two RCA input pairs and two RCA output pairs, with optional balanced XLR operation, input selection, mute, bypass, and a switchable choice of 6922 or 6SN7 tubes. The compact unit is straightforward as a line-level tube buffer, but it includes neither DAC functionality nor headphone outputs.
Value for Money
85/100
At $2,900, the Analog Bridge is a specialist component for listeners seeking adjustable tube character in an existing system. The review calls its effect on a solid-state system remarkable, but does not directly compare its price or value against competing tube buffers or preamplifiers.
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