WORKING CONDITION: Very Good. The power switch is soldered to the always ON position, so if the unit is plugged in, the power is ON. Both channels work and add a nice amount of saturation to the input signal. Channel 1 can be plugged into Channel 2 for more over-the-top sounds, bordering on the heavy fuzz of the EHX Big Muff Pi.

PHYSICAL CONDITION: Good. There is some patina to the raw metal, and the faceplate, knobs and iO jacks are in very good condition. 

INVENTORY #59259

BRAND: PAiA

MODEL: TubeHead

FUNCTION: Rackmount Tube Guitar Preamp 

PRODUCT DESCRIPTION: This listing is for a PAiA TubeHead Rackmount 2ch Tube Guitar Preamp. The PAiA TubeHead (Model 9305) is a classic, low-cost dual-channel (stereo) vacuum tube preamplifier and distortion processor originally released in the 1990s as a DIY kit. Often built into a 1U rackmount format, it is popular among guitarists, electronic musicians, and studio engineers for adding "starved-plate" tube warmth and controlled saturation to line-level instruments and tracks.

SPECS:

• Starved-Plate Topology: The TubeHead utilizes an innovative design that operates its twin 12AX7 triode vacuum tubes at a very low plate voltage. This drives the tubes very low on their plate characteristic curve, yielding smooth, non-abrupt clipping and natural compression rather than harsh solid-state clipping.
• Independent Dual Channels: It features two fully separate channels, allowing for true stereo operation or the processing of two distinct instruments (like a guitar and a bass) simultaneously.
• Solid-State Blend: Each channel features a variable "blend" control. This allows you to mix the clean, transparent solid-state input signal with the tube-distorted signal for parallel processing.
• Drive / Pre-Gain: Dictates how hard the input signal hits the vacuum tubes, controlling the level of saturation and compression.
• Blend: Balances crisp solid-state transparency with exaggerated tube caricature warmth.
• Output Level: Masters the final output volume to prevent clipping downstream audio interfaces or mixers.
• Physical Connections: Typically configured with 1/4" phone jack inputs and outputs on the rear chassis.

ACCESSORIES INCLUDED: This item comes as seen in photos and does not include any accessories.

EXTRAS INCLUDED:

• None

UNPACKAGED WEIGHT: 3 lbs.

UNPACKAGED DIMENSIONS: 19" x 2" x 6"