Detail 01
Two selectable opamps
The x731 and x18 respond differently when gain is pushed into saturation.
Product detailSKU #1500000301319
Warm AudioTB12 Black Tonebeast Microphone Preamp
1/5
Independent shopping perspective
The Korena take
Warm Audio’s TB12 Tone Beast is a microphone preamp built around gain, saturation, and selectable signal paths. Two opamps and two output transformers let you change how the unit reacts as it is driven, while the output control lets you keep the outgoing level in check at high gain settings. The x731 breaks up sooner with more color; the x18 stays more linear and takes longer to saturate. You can also bypass the output transformers or replace the stock opamps.
Strong match
Who this is for
- Recording electric guitar or bass with deliberate high-gain grit and distortion.
- Studios that want to compare opamp and output-transformer behavior while driving a preamp.
- Shaping a signal near saturation while controlling the level leaving the preamp.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Two selectable output transformers
The steel and 50% nickel transformer options impart different character when driven.
Detail 03
Output control
Lets you limit the signal leaving the preamp even while using very high gain.
Final check
Know before you order
- 01Opening the unit and replacing opamps may affect warranty coverage.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Which opamp saturates faster?
The x731 (Melcor 1731) breaks up faster and adds more color when pushed than the x18.
02Can the TB12 be set for a cleaner result?
The x18 with the output transformers bypassed is described as the ultra-clean, low-character option.
03Can the stock opamps be replaced?
Yes. The TB12 is designed so users can remove the stock opamps and install their own.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- Black
