VTL TL-7.5 Preamplifier

MSRP: Contact Us

If you want the music AND the message, and you want it right there right now, then the TL7.5 Series III is a great place to start, the MB450 Series IIIs the perfect partners. Costly to purchase and demanding to house they may be, but these electronics will deliver the warm, beating heart of a truly great system; for once, value really isn’t an issue. Roy Gregory-HiFi+

Product Description

VTL TL-7.5 Preamplifier Specifications

Vacuum Tube Complement 2 x 12AU7
Inputs 4 pairs balanced/XLR or RCA single-ended, 4 pairs single-ended/RCA
Outputs 2 pair balanced out, 2 pairs single-ended RCA out, 2 pairs single-ended RCA buffered Tape Out
Remote control functions Power, Source Select, Volume up/down, Mute, Fade, Balance Control, Phase Reverse
Gain Balanced in and Balanced out: 19.2 dB, Single-ended in and Balanced out: 19.2 dB
Balanced in and Single-ended out: 13.2 dB, Single-ended in and Single-ended out: 13.2 dB
Output impedance 25Ω, Max 150Ω @ 10Hz
Input impedance 50kΩ, 20kΩ min
Frequency Response +0 -1 dB 1Hz – 100kHz (20Hz – 100kHz +0 –1dB into 600Ω with 900pF 20’ interconnect cable)
Maximum Output Voltage <1% THD 30V into 10kΩ or above (10Hz – 200kHz +/-1dB)
10V into 600Ω
Channel separation >100dB @ 1kHz (>80dB @ 20kHz)
Power consuption 150W
Dimensions W x D x H Control chassis – 17.5 x 17.5 x 4 inches (44.5 x 44.5 x 10.2 cm)
Audio chassis – 17.5 x 17.5 x 6 inches (44.5 x 44.5 x 15.3 cm)
Weight 90 lbs (40.82 Kg) Fully packed in two boxes
Unpacked weight: Audio Unit – 38lbs (17.24Kg), Control Unit – 32lbs (14.50Kg)

VTL TL7.5 Preamplifier Features

  • Isolated Control Unit chassis with 12 separate fully regulated power supplies
  • Separate Audio Unit chassis with zero internal digital activity and isolated from AC and power supply noise

Audio unit features

  • Fully balanced differential circuit with balanced in and out, and mirror-image layout
  • Simple 2-stage circuit topology with differential gain stage and output buffers for musical purity and integrity
  • Ultra low impedance output stage to drive any length of cable and any power amplifier/paralleled amplifier/subwoofer load
  • 30 microfarad output capacitors for vastly improved bass control
  • Tube complement: 2 – 12AU7 tubes
  • Gain switching between normal gain and low gain with 6dB gain reduction
  • Single fully balanced differential 95-step 70dB discrete resistor relay attenuator for all attenuation functions, using low signal instrumentation ruthenium relays for greatest resolution
  • Microphonically damped tube gain stage for greater vibration noise elimination

Control power supply unit features

  • Ramped B+ filament soft-start power up for extended tube life
  • Huge energy storage power supply for elimination of AC fluctuation and noise rejection
  • Low noise processor control design for all functions

User interface features

  • Processor loop – any of 8 inputs can be assigned as fixed unity gain pass through
  • Tape monitor function for both tape loops
  • 4 separately programmable trigger outputs
  • Bi-directional RS-232 interface
  • Programmable input offsets
  • Selectable padded inputs
  • Rigid Combination steel and non-magnetic chassis and machined aluminum remote wand
  • Factory upgradeable from Series I and Series II

Audio unit features

  • New FET device output stage for more tube-like sound and simpler circuit
  • New device in the gain stage current source for improved musicality and better single-ended operation
  • Zero Global NFB for vastly improved faster dynamic and tonal resolution, and unconditionally stable circuit, without any phase shift.
  • All audiophile grade Mundorf capacitors in signal path with bypass system for improved HF resolution

Control power supply unit features

  • Vastly improved lower impact and greater precision-regulated current-sourced shunt power supply
  • Teflon power supply bypass caps for improved top end

VTL TL7.5 Preamplifier Overview

More than eight years after introducing the TL-7.5 Reference preamplifier to universal acclaim, VTL presents the latest version, the TL7.5 Series III. The new model incorporates numerous technological advances while retaining the best elements of the TL7.5 platform. The proven strengths of the original system architecture include: a fully balanced differential design; a hybrid circuit that combines tubes in the gain stage for voltage linearity (less than 2dB NFB) with a MOSFET buffer for greater current capacity; a high resolution volume control; and a clean box/dirty box architecture with multiple precision-regulated power supplies. The highly-regarded user interface of the TL7.5 platform sets the standard for intuitiveness, and ease of use.

The Series III builds on improvements made to the Series II for an even higher level of performance. The new design features an extensively revised power supply based on current-sourced shunt regulator technology that minimizes impact on the audio signal by eliminating high voltage gain. Far more precise power regulation yields dramatically improved rejection of noise and AC fluctuation.

The completely redesigned high current gain stage utilizes newly available FET technology developed for green technologies such as solar panels and electric cars that require a normally-on state. Unlike MOSFETs that need to be biased on, normally-on devices operate more like vacuum tubes in the audio output stage, with simpler circuits that continuously conduct current, resulting in a more tube-like sound. The high-current gain stage has been further optimized for linearity with zero global negative feedback in the circuit.

Also included in the upgrade are new specially selected audiophile grade capacitors and a fully bi-directional RS-232 control interface for increased compatibility with modern home theater systems.

Enhancements to the Series III result in an even higher level of coherence, integration and transparency of sound, with dramatically improved mid-bass and midrange, and a more tube-like sonic character. The VTL TL7.5 preamplifier represents a new level of performance for music lovers.

About Analog Audio of Minnesota

Analog Audio of Minnesota offers world class stereo equipment to the Minneapolis/St. Paul and greater Minnesota area. Located in Maple Grove, Analog Audio of Minnesota provides a unique environment to audition home audio equipment and the latest record releases. Come visit us for all of your home audio and two channel stereo system needs.

Interested in vinyl playback? Analog Audio of Minnesota is recognized nationally for its experience, product offerings and unmatched set-up and ongoing service. To learn more about our analog products, browse our turntable department.

Service

Analog Audio of Minnesota prides itself in its service. We offer in-home consultations in the greater Twin Cities area to learn about your goals and provide expertise to guide you through the purchase process. Of course, your stereo equipment will be expertly set up and optimized in your home by our service technicians. Questions with your audio equipment? Not to worry, our service staff is available to assist you.

To learn more about Analog Audio of Minnesota, please visit our About Us page. Ready to set up an appointment to audition a component or learn about our products and services?  Give us a call at (612)808-0709 or drop us a note. We look forward to hearing from you.