ZOTL Ultralinear Amplifier
ZOTL Ultralinear Amplifier
The LTA Ultralinear is the latest ZOTL amplifier design by David Berning: the first Ultralinear amplifier not limited by traditional output transformers.
“I did all of my listening to this amp in my reference system, and I’ll start by saying this is the best Class AB amplifier I have ever heard. The first thing I noticed was that the LTA Ultralinear was the quietest amp I have ever heard; not the quietest tube amp, but the quietest amp. I think this enabled me to hear some of its most captivating qualities; its incredible sense of pace and rhythm, explosive dynamics, and micro-dynamics. I found myself tapping my foot almost as often as I do when listening to live music. The amp is so unbelievably natural that it was hard to think about anything but the music, the glorious music.”
- The Audio Beatnik, 8-16-18
The LTA Ultralinear is the latest ZOTL amplifier design by David Berning, utilizing his Zero-hysteresis output transformerless audio design and his unique power supply.
The LTA Ultralinear outputs 20 watts per channel using 17JN6 tubes, a Compactron-style TV sweep tube that can't be easily used in traditional transformer-coupled amplifier designs. The ZOTL circuit is able to take advantage of these great-sounding, under-utilized tubes, and in this case, does so in what can be considered the only ultralinear amp without traditional output transformers.
David designed the amplifier specifically for high efficiency speakers. A balance between triode and pentode mode, the ultralinear topology delivers a less forward presentation which is "more pleasing to listen to". The Ultralinear delivers accuracy, detail and realism. Pianos sound like pianos. The bass is controlled but fluid. Very transparent, no hum and very dynamic.
The power supply is an advanced switching supply optimized for audio that only David Berning deploys. All the benefits of ZOTL technology, including 3 times the tube life, 1/3 the heat, a super wide frequency response of 8hz -60Khz, and a under 2 ohm output impedance to play nicely with all speakers, are all included. There is also a sophisticated speaker protection system to prevent damage to the amplifier and speakers if there ever was a tube issue.
Fern and Roby Audio designed the casework featuring front and rear panels milled from slabs of aluminum, Cardas RCAs, WBT copper binding posts, front panel industrial toggle switch, and a stereo mono switch with all markings laser engraved.
David Berning designed, hand-built by Linear Tube Audio, with casework by Fern and Roby.
Inputs: One pair L & R Cardas RCA
Outputs: One set of stereo WBT speaker binding posts
Amplifier class: Push-pull class AB
Power output: 20 watts channel 8 ohms
Frequency response: 8hz to 60khz - +0, -.5db
Stereo/Mono: Switchable Stereo-Mono
Weight: 23 lbs.
Tube complement: 12AU7 and 12AX7 input tubes, 17JN6 power tubes - Autobias for all tubes. All tubes NOS.