MANLEY VARIABLE MU® MASTERING VERSION WITH T-BAR MOD
T-Bar Modification and Mastering Version: Precision, Vintage Tone, and Mastering Excellence
T-Bar Modification for Vintage Tone:
The T-Bar Modification is a solution developed by Paul at Manley Labs to address the challenges posed by the unavailability of the original USA GE 6386 tubes, which were a crucial component of the classic Variable Mu units. With the 5670 tubes replacing the 6386, the T-Bar Mod seeks to maintain the smooth limiting curves characteristic of the original 6386 tubes. The modification involves using a pair of 6BA6 pentodes wired as single triodes to replace each dual triode 5670 (or 6386). This ensures optimal matching, low noise, and minimal microphonics. The T-Bar Mod not only resolves tube scarcity issues but also retains the vintage tone and performance of the classic Variable Mu, making it a preferred system.
Mastering Version for Precision and Flexibility:
The Mastering Version of the Variable Mu Limiter Compressor is tailored for the exacting requirements of mastering engineers. It features detented and loggable steps achieved with 1% metal film resistors on sealed gold-contact Grayhill switches. The use of Greyhill rotary switches with gold contacts enhances precision, repeatability, and left-right matching. Stepped controls for Input Level, Output Attenuators, Threshold, Attack, and Release provide mastering engineers with a high degree of control over their settings. The Mastering Version is designed to meet the rigorous demands of mastering studios, offering a subtle audible improvement with stepped switches, a crucial feature for achieving optimal performance in high-end audio production.
Key Features of T-Bar Modification and Mastering Version
- T-Bar Modification:
- Replaces 5670 or 6386 tubes with a pair of 6BA6 pentodes per channel.
- Preserves smooth 6386 limiting curves for vintage tone.
- Addresses issues of tube availability, noise, and microphonics.
- Maintains the classic Variable Mu performance.
- Mastering Version:
- Detented and loggable steps for precision.
- 1% metal film resistors on sealed gold-contact Grayhill switches.
- Stepped controls for Input Level, Output Attenuators, Threshold, Attack, and Release.
- Enhanced left-right matching for mastering applications.
- Input Level Control:
- Five-position switch for quick adjustments.
- Optimum setting at "0," with each step in either direction providing 2 dB change.
- Output Attenuators:
- Half dB steps for fine-tuning gain makeup.
- Reference Unity at -11.5 or fully counter-clockwise.
- Threshold Control:
- Half dB steps in LIMIT mode (24 detents) and approximately 1/4 dB steps in COMPRESS mode.
- Wide range of adjustment for precise threshold control.
- Attack and Recovery:
- Extended Attack Time in 11 steps for dynamic control.
- 5-position Recovery switch for tailored release times.
- Mono-Friendly Design:
- Ganged input control with separate threshold and output controls.
- Suitable for both stereo and mono applications.
- LINK Mode:
- Takes advantage of the stereo input control for final mix, 2-track, or mastering limiting and compression.
- Enhances warmth and cohesiveness in the mix.
The combination of the T-Bar Modification and Mastering Version ensures that the Manley Variable Mu Limiter Compressor continues to be a go-to choice for audio professionals, offering vintage tonal characteristics, precision control, and tailored features for mastering applications.
