IMPORTANT NOTICE - JULY 2018 -Response Audio will be producing a final run of our Spirit Tube Linestages and Segue Tube Buffer and Segue Tube Buffer/Preamp before taking a short hiatus to focus on other designs for Purity and another company. For pieces currently available for shipping, please visit our Custom Builds Page. If you would like a custom Spirit or Segue built for you, please take a look at the web page for the model you are interested in and contact us for pricing.

The Spirit X provides some of the finest components available today making it an exceptional valued, reference level 
tube preamp currently offered. You will not find another preamp in this price point that offers so much or sounds as good.

Overview. The Spirit X is an enhanced, tranformer coupled version of our Spirit tube linestage with a choke filtered power supply along with the inclusion of a full polypropylene power supply. Take a look at the Spirit's Standard Features below to understand why the Spirit X could possible be the best sounding preamp you can own without going into double digit pricing.

You will be amazed by the performance of this affordable vacuum tube preamplifier. The Spirit X  utilize the same Class A, Zero Feedback circuit and performs well above it's affordable price indicates. The Spirit X is housed in the same chassis as the Spirit linestage. A rugged aluminum chassis measuring 16" W x 12" D x 3.25" H. 

Circuit: The Spirit X uses the same circuit as the standard Spirit but has been enhanced to accommodate the use of output transformers. We also offer RCA balanced outputs to pair the Spirit X with our Ibrido MK II hybrid power amplifier. The signal path capacitors have been upgraded to DynamiCap pieces of a much larger capacitance.

Power Supply: The Spirit X offers a choke filtered power supply with a high current toroidal transformer for the B+ rail and high quality filter capacitors. Full array of polypropylene filter capacitors have also been added for an even lower noise floor. Music Bella products are already noted for having an exceptionally low noise floor.

The circuit is based on the 6922 dual triode with a constant current source topology. Why the 6922? The 6922/6DJ8 is superior with harmonic distortion 1/8th (-18db less) that of any 6SN7 variety/equivalent, or other tube type. Signal path components include high precision Carbon Film resistors, output transformers, DynamiCap output capacitors and high quality cryogenically treated, silver plated copper signal wiring. A remote Alps Blue volume pot with Mute function is standard.

Front panel options: The Spirit  comes equipped with an HT Btpass.  While some may desire this options to fit into their system configuration, there are many, including myself, that do not need or want the extra circuitry. You can choose to leave this option out for a more pure signal.

The Spirit X's circuit and well designed power supply provides a black as night presentation.
The back panel houses 4 sets of single ended inputs and 2 sets of transformer coupled single ended outputs or 1 set of RCA balanced outputs.

All Spirit preamps are custom made in house one at a time as orders are received. Please note this is a time consuming process and delivery times vary depending on work load. Please contact us for build time on your unit.

Spirit - Standard Features

- Pure Class A 6922 Triode vacuum tube purest design

- Dynamicap signal capacitors
- Transformer coupled single ended output 

- RCA balanced output optional
- Cryogenically treat, silver plated in Teflon signal wire
- High current toroidal PS transformer

- Central one-point star earth grounding
- Solid state power supply provides a high speed 
​energy delivery on transients

- Ultra Fast - Soft Recovery high current Fairchild diodes
-  100% polypropylene power supply filter capacitors
- Choke filtered
- Highly regulated DC filament supply
- Remote volume w/Mute
- Precision carbon film resistors 

- HT Bypass
* Fully hand assembled to insure the highest level of craftsmanship
* Chassis finish: Black Anodized Aluminum/
* Line Inputs - 4 sets single ended or 1 set balanced
* Line Outputs - 2 sets transformer coupled RCA
* Made in the USA
* Two year parts and labor warranty: 30 days on supplied vacuum tubes.

* Retail Price - 

* Selling Price 

Circuit: 6922 Class "A" zero feedback
Stage Gain: 15.5dB
Input Impedance: 100k ohms
Output Impedance: 180 ohms
Phase: Inverts
Frequency: <10Hz->35kHz
Fuse: 1.2A slow
Voltage: 110V-120V / 220V-240V

Specifications subject to change without notice.

Availability INQUIRE


Spirit X
Class A Vacuum Tube Linestage

Enhanced Version, Transformer Coupled,
Remote Volume/Mute and More.