LTA Ultralinear ZOTL Power Amplifier
This power amplifier has earned the right to be called our “favorite” and we believe that if you have the opportunity to audition one, it will quickly become your new reference piece of equipment.
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.
Design Features
All the benefits of David Berning's 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.
General Specifications
20 watts channel 8 ohms
Push pull class AB
Frequency response 8hz to 60khz - +0, -.5db
Input - One pair L & R RCA
Output - One set of stereo speaker binding posts
Switchable Stereo-Mono
Power Supply
The Ultralinear features an advanced switching power supply designed by David that has been the foundation of several of his most cherished designs.
• 115VAC or 220VAC - 50/60Hz - IEC receptacle
Tubes
17JN6 power tubes
12AU7 and 12AX7 input tubes
Autobias for all tubes
All tubes NOS
I/O & U/X
The casework designed & manufactured by Fern and Roby features front and rear panels milled from one inch slabs of 6061 aluminum plate to improve manufacturabilty and deliver excellent grounded connections for all critical hardware to ensure improved sonic performance.
Hardware: Cardas RCAs, WBT copper binding posts, front panel industrial toggle switch, and a stereo mono switch with all markings laser engraved.
Dimensions & Materials
Dimensions: H - 5.5", W - 17", L - 15" (including binding posts)
Weight - 15lbs. or 6.75kg
Face and Back plates: 6061 Aluminum plate with a black "honed", Hard Anodized finish
Sheetmetal: 6061 with powder coated black finish