Harmonic Stage
A tube line buffer with true bypass and documented coloration modes for listeners who want a deliberate, measurable tube effect.
Designed, built, and shipped from Wyoming.
Made to order · 56 days (8 weeks)
Estimated ship date if ordered today: 2026-12-11
We make every effort to finish and ship earlier. The estimated date allows for production and final checks.
Tax and shipping are calculated before payment. About made-to-order builds.
What it does
A deliberately characterful tube buffer for placement between a line-level source and a preamplifier/amplifier. It offers a true bypass and selectable documented operating modes. It is not a DAC, equalizer, compressor, or restoration device.
Required but not included
- Line-level source
- Downstream preamplifier or amplifier
- Suitable stereo interconnects
Included
- Hardwood/metal tube buffer with bypass and validated operating modes
- Level-matched mode measurements, instructions and serialized build record
What it does not do
- Not a DAC, equalizer, compressor or restoration device.
- Does not recover missing recording information or guarantee a preferred sound.
- Bypass, gain matching, transition behavior, noise and harmonic spectrum are specified for the released revision.
Specifications
Specifications apply to the selected configuration. Estimated values are identified below.
| Input/output | Estimate: 1 stereo RCA pair each |
|---|---|
| Modes | Estimate: Relay true bypass plus 2 validated active modes |
| Gain | Estimate: Near unity with calibrated level matching; exact values published |
| Tube | Estimate: One common dual triode or final validated complement |
| Power | Estimate: 120 VAC or approved external supply; final design controls |
| Enclosure target | Estimate: Approximately 9 W x 7 D x 4 H in body |
| Standard lead time | Estimate: 8 weeks |
| Production estimate | Made to order; estimated 8 weeks, confirmed with the accepted order. |
| Opening price | $879 base; options priced only when available in the configurator. |
| Black finishes | Satin black or polished piano black; piano black adds approximately three weeks. We make every effort to ship earlier. |
| Optional handles | Pair of hand-machined, polished solid brass handles, nominal 6-inch grips. |
Design revision 12 · Current product reference.
Options
Choose the available options in Your configuration. Your selection updates the item price and is saved with your order.
What it does
A deliberately characterful tube buffer for placement between a line-level source and a preamplifier/amplifier. It offers a true bypass and selectable documented operating modes. It is not a DAC, equalizer, compressor, or restoration device.
Compare bypass and active modes
The design offers a bypass path and selectable tube operating modes. Active modes are intended to change the signal character; the result depends on source, load and listening preference. They do not restore missing information from a recording.
Product information
Ask for measured level, noise, response and harmonic behavior for the selected revision. Compare modes at matched volume when assessing the effect.
Ordering and configuration
Configuration and specifications are confirmed during order review. Ask for the measurements and documentation applicable to your build.
Made-to-order price and scope
Base price $879. Estimated production 8 weeks. Exact configuration, included items, exclusions and ship date are agreed before payment.
Documentation & connections
Find connection details, operating requirements and product information in the reference below.
Read the product reference →Buying and setup guides
Made to order. Supported by people.
Read about shipping and production estimates, returns, repairs and warranty, and safety and certification.