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WARNING: For safety, the cover of this amplifier should be secured at all times. DC
voltages as high as 700V and peak AC voltages as high as 800V are present inside. The service
information contained in this manual is intended only for trained service personnel. Furthermore,
this amplifier generates radio-frequency energy that can interfere with communications
equipment.
Note: The circuitry is different in ZOTL amplifiers than any other tube amplifier. Do not
attempt to service this yourself even if you are familiar with tube amplifier circuitry.
Call or email Linear Tube Audio if you have any need to service this amplifier.
Introduction
The ZOTL10 is a high quality Class AB tube Power amplifier utilizing ZOTL (Zero-hysteresis
Output Transformer-Less) technology. This is significantly different from traditional OTL
(Output Transformer-Less) technology.
Features
• ZOTL technology eliminates the need for output transformers,
• ZOTL technology enables the correct turns ratio coupling between amplifier and speakers
(which cannot be done using output transformers)
• ZOTL technology operates tubes operated in a manner to last as long as 10,000 hours
• Very little hum – not audible until volume is turned up more than 50%
• Uses 4 EL-84s, 2 12AU7s, and 2 12AT7 tubes. Supplied with current-production Genalex
Gold Lion tubes.
• 3 Inputs – RCA without volume control, RCA with volume control, or unbalanced XLR/
phone jacks
• Sophisticated protection circuity monitors the output to shut the amplifier down if the
wrong signal is detected. Amplifier is not harmed if nothing is connected when turned
on, but the protection circuitry functions much better if speakers are connected.
• Auto-bias circuitry for automatic tube biasing.
ZOTL10
POWER AMPLIFIER
USER GUIDE
Linear Tube Audio
Takoma Park, MD USA
301-448-1534
hifi@lineartubeaudio.com
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Summary of Contents for Linear Tube Audio ZOTL10
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Page 1: Power Amplifier
Note: The circuitry is different in ZOTL amplifiers than any other tube amplifier. Do not attempt to service this yourself even if you are familiar with tube amplifier circuitry. Call or email Linear Tube Audio if you have any need to service this amplifier. 301-448-1534 hifi@lineartubeaudio.com... - Page 2 • Patented impedance conversion technology Operation Operation of the ZOTL10 amplifier is straightforward. It is not an integrated amplifier, but can be used with a high-level source such as a preamp, CD player, DAC or electronic crossover. We do recommend that it is paired with a preamp. The amplifier has one set of speaker binding posts per channel.
- Page 3 Normal operation with Right and Left inputs and Right and Left speaker outputs are enabled with the switch in the Stereo position. The ZOTL10 can be operated as a mono amplifier, with both channels bridged into one speaker to provide approximately 1.7 times the singe channel output.
- Page 4 Tube Replacement. Fuses The ZOTL10 has three fuses, two of the 5x20mm type 3.15A, in the AC power input assembly. There is a 5A 5x20mm fuse on the audio board in the power supply in the lower section of the amplifier enclosure.
- Page 5 If you’re experiencing distortion immediately and cannot identify the source, look for components in the source chain that may be leaking DC, such as power supplies. The ZOTL10 does not have a capacitor at the input to filter DC (in order to not compromise audio quality), so is susceptible to such leaks.
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