Tube Works IVAC65-112 User Manual

This exciting new guitar amplifier design offers dynamic versatility from its user friendly analog topol-
ogy. The focal point of the most sought after tone in guitar amplification is the character and warmth
of the 12AX7 tube. Our INTERGRATED VALVE AUGMENTED CIRCUITRY utilizes the tube (valve)
as the center point in the design and enhances its tone with unique circuits that shape the tonality,
gain and saturation. The result is a highly versa- tile guitar amplifier with traditional analog knobs that
allow the performer to use the amp as an extension of the instrument.
The 5 gain stages in the preamp are coupled to our high-output 65 waft solid-state amplifier design
that features true high-fidelity audio reproduction and include complete short circuit, VI limiting over-
load curves and precise thermal tracking protection. A patented “SPIKE" thermal management sys-
tem is built into the power transistor, providing an elegant form of management and protection of all
vital amplifier parameters.
This amplifier is rated at a “real world” 65 watts RMS @ 4 ohms but with dynamic headroom in ex-
cess of I 00 watts! The complete design and features combine to make the IVAC an uncompromising
guitar amplification system.
FEATURES AND OPERATION OVERVIEW:
INPUT - The IVAC-65 is equipped with a standard 1/4” input. The input impedance is approximately
500k ohms, which we determined provides the best response from all pickups currently available. An
added benefit of this 500k impedance is the smoothness of the tonal response, consistency of sus-
tain and an overall reduction of noise. Additionally, the precision input scaling preamp contains a 40
Hz, 12 dB/octave high pass filter (more effective and less intrusive than the more common 6 dB fil-
ters) and an “RFI” filter (radio frequency interference) to eliminate bleed-through from those pesky
DJ's and truckers.
CLEAN CHANNEL -The IVAC-65's clean channel is constructed using a monolithic FET amplifier for
a clean, sweet, non-distorted sound. The tone is natural and open, lending itself readily to any musi-
cal style. The CLEAN GAIN control uses “loop feedback" style circuitry for wide dynamic range and
an exceptionally low noise floor. Whether playing soft or hard, the responsiveness of the clean pre-
amp is punchy and articulate, with a big bottom end that is not muddy or overpowering. Mixing this
signal with the overdrive channel will give the player endless possibilities.

Tube Works IVAC65-112 Specifications

General

Brand	Tube Works
Model	IVAC65-112
Category	Musical Instrument Amplifier
Language	English

Summary

Introduction and Amplifier Overview

Exciting New Guitar Amplifier Design

Highlights the dynamic versatility of the analog topology and the use of the 12AX7 tube for warmth and tone shaping.

High-Output 65 Watt Solid-State Amplifier

Details the amplifier's features including high-fidelity audio, short circuit protection, VI limiting, and thermal management.

Features and Operation

Input and Signal Conditioning

Describes the 1/4" input, 500k ohm impedance, precision scaling preamp, 40 Hz high pass filter, and RFI filter.

Clean Channel

Details the monolithic FET amplifier for a clean, open sound with wide dynamic range and low noise floor.

Tube Drive Channel

Explains the musical preamp and overdrive control circuit using a 12AX7 tube for warm, rich tone with natural harmonics.

Tube Texture Section

Covers a control section with switches for tailoring circuit parameters to customize individual tone.

Channel Switching and Mixing

Explains the FET/TUBE switch and MIX switch for layering clean and tube channels for varied effects.

Boost and Attack Functions

Describes the BOOST switch for added drive and the ATTACK switch/control for increasing bite and sustain.

Body and Presence Controls

Details shelving EQ controls for enhancing tone, providing thick chunk or adding snap and spank.

Switch Function Operation

Explains how amplifier switches affect only the tube channel and how they interact with the footswitch.

Master Equalization and Reverb

Details the 4-band active EQ for smooth tonal adjustment and the REVERB MASTER control.

Master Volume and Power

Covers the MASTER VOLUME control for overall output and the POWER SWITCH for AC mains power.

Connectivity and Outputs

Describes footswitch input, effects send/receive, direct output, headphone output, and speaker outputs.

Power Inlet, Voltage Selector, and Fuse

Details the IEC power inlet, voltage selection between 115V and 230V, and the internal fuse.

Suggested Tone Settings

Spankin' Clean Tone

Recommended tone settings for a 'Spankin' Clean' sound, played with a Fender Strat.

Texas Blues Tone

Recommended tone settings for a 'Texas Blues' sound, played with a Fender Strat.

Jazz Tone

Recommended tone settings for a 'Jazz' sound, played with a Gibson Les Paul.

Classic Rock Tone

Recommended tone settings for a 'Classic Rock' sound, played with a Gibson Les Paul.

Heavy Metal Tone

Recommended tone settings for a 'Heavy Metal' sound, played with a Gibson Les Paul.