Advertisement
THÖRESS
Hybrid Triode . Mono . Power Amplifier
=============================
"EHT Mono Block"
................................................................
I N S T R U C T I O N
M A N U A
L.............
Thank you for purchasing the
Hybrid Triode Mono Power Amplifier! The
THÖRESS
most powerful amplifier model in our product line provides 30, 40 or 50 watts of
output power into a 8, 6 or 4 ohm load respectively, combined with very low output
resistance (high damping factor). Such providing excellent drive capability for
loudspeakers with medium to low efficiency or with critically low impedance which
may present a challenge for our all-tube single-ended triode amplifier models.
The amplifier is built with meticulous hand construction using our proven point-to-
point wiring techniques. Much care has been taken in arranging each aspect of the
internal construction to ensure low noise performance, ease of service and the
highest reliability for many years to come. Please read the following explanations
and instructions carefully to get the most out of your EHT Mono Amplifier!
TUBES
The vacuum tube gain section of the EHT Mono Amplifier comprises a
6J5GT or 7A4
triode whereas a
12HG7 or 12GN7A
beam power pentode operated in triode mode is employed in the buffer section in-
between the gain stage and the MOSFET output stage. The 6J5GT tube is a medium-
gain octal base triode with fairly low transconductance from the early times of tube
electronics, whereas the 12GN7 is a rather modern (all-glass) high transconductance
power tube with high gain capabilities, making it an ideal choice for buffer
applications. The amplifier comes with a set of tubes which have been carefully
tested and hand-picked to meet tight specifications. It is strongly advisable to use
only the carefully tested matched sets of driver tubes supplied by the manufacturer.
The use of tubes with questionable characteristics may lead to a degraded sonic and
signal-to-noise performance. Even serious damage may occur in worst case scenarios!
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for THÖRESS EHT Mono Block
Summary of Contents for THÖRESS EHT Mono Block
- Page 1 THÖRESS Hybrid Triode . Mono . Power Amplifier ============================= "EHT Mono Block" ..............I N S T R U C T I O N M A N U A L…..Thank you for purchasing the Hybrid Triode Mono Power Amplifier! The THÖRESS...
- Page 2 GAIN & BASS BOOST SELECTOR The EHT Mono Amplifier allows for on-the-fly adjustment of the gain (input sensitivity) in 7dB-steps by means of a 6-position rotary switch on the rear panel near the input jack. The (voltage) gain is 4dB (1.5-times) , 11dB (3.5-times), 18dB (8-times) and 25dB (20-times) when the switch rests in position 1, 2, 3 and 4 respectively (neutral tonality, flat frequency response).
- Page 3 SETUP To set up a pair of EHT Mono Amplifiers switch off all components of the system and proceed as follows. Do not connect the L+R amplifier to the mains until steps 1 to 7 have been taken. 1. Set the power switch (on the power inlet module) to the OFF position on both units.
- Page 4 loudspeakers and/or the preamplifier! When powering off the system, always switch off the power amplifier first, then switch off the other components of the setup, observing a delay of at least 30 seconds! Keep the original crate and the tube protection case for later use. They have been specifically designed for safe transport under rough conditions! Shipping the amplifier in inadequate packaging will result in catastrophic damages! F E A T U R E O V E R V I E W...
Need help?
Do you have a question about the EHT Mono Block and is the answer not in the manual?
Questions and answers