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QII 80 Lancaster Grey
The Quad II-Eighty valve amplifier is the perfect partner to the Quad ESL speakers. Designed by one of the most famous tube-amplifier designers in the world, Tim DeParavicini, the Quad II-Eighty takes inspiration from the ori...
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Specifications
- Country (main office) United Kindgdom
- Type power amplifier
- Color Lancaster Grey
- Damping factor 16
- Gain channels 1
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Quad QII 80 Mono Power AMP Lancaster Grey
The Quad II-Eighty valve amplifier is the perfect partner to the Quad ESL speakers. Designed by one of the most famous tube-amplifier designers in the world, Tim DeParavicini, the Quad II-Eighty takes inspiration from the original Quad II amplifier.
It is an 80-Watt mono power amplifier following in the tradition and philosophies of Peter Walker. The output section consists of 4 KT88 valves running as two pairs in push-pull with the hallmark Quad topology of partial cathode loading in the output transformer. This method reduces distortion when compared to the usual Ultra Linear or triode methods, however, it does require a greater grid driving voltage, achieved using a balanced pair input stage.
The output transformer was designed to improve high frequency performance and accurately balance the push pull halves. Also, the transformer was designed to make sure that full output is realised at the bass frequences down to 20 Hz.
Each output valve has its own cathode resistors to provide reliability and self-matching. The screen grids of the KT88 valves are run from a lower voltage, again for good reliability. The whole amplifier has a total of only 16 dB of feedback providing good stability into virtually any known loudspeaker and especially the famed Quad electrostatic loudspeakers.
Specifications
Basic
Country (main office)
United Kindgdom
Type
power amplifier
Color
Lancaster Grey
Damping factor
16
Gain channels
1
Headphone output
no
Lamp model
2 x 6SL7, 4 x KT88, 1 x 6SN7
Maximum frequency, Hz
30000
Minimum frequency, Hz
10
Remote control
no
Signal-to-noise ratio, dB
94
THD (Total Harmonic Distorsions), %
0.3 (40 W), 0.5 (80 W)
Features
Arrow indicator
no
Equalizer
no
Separate terminals for different impedances
yes
Functions
Built-in DAC
no
Inputs
RCA line inputs
1
Power
Power consumption, W
180
Power per channel (4 ohm), W
80
Power per channel (8 ohm), W
80
Wireless connection
Bluetooth
no
Wi-Fi
no
Dimensions
Weight, kg
20.5
Height, mm
208
Depth, mm
174
Width, mm
421
Quad
The history of Quad is one of technical achievement in the field of sound reproduction. It is a story that began with the Quad 1 amplifier, which brought the benefits of 15 years knowledge and experience in professional audio and industrial products to the task of making the most accurate domestic audio amplifier of its age.A few years later, in 1953, the product which set the standard for amplifiers was the Quad II Power Amplifier, the time of Queen Elizabeth’s Coronation and the year in which Mount Everest was finally conquered. This amplifier pioneered the principle of cathode coupling through the output transformer to reduce harmonic distortion to almost negligible levels. Such was its clear superiority that this model remained in production for 18 years. Three years later, in 1956, Quad demonstrated the first true full-range electrostatic loudspeaker. This remarkable product (known later as the ESL 57) used a virtually mass-less plastic film as a moving diaphragm between two charged plates. Compared with moving coil loudspeakers, the ESL 57 was free of unwanted colourations and distortions. This landmark product remained in production, virtually unchanged, for 28 years.
Find out more about Quad
We also offer you
About brand
Quad
Free expert consultation
Connection and setup
Call an expert
Quad
The history of Quad is one of technical achievement in the field of sound reproduction. It is a story that began with the Quad 1 amplifier, which brought the benefits of 15 years knowledge and experience in professional audio and industrial products to the task of making the most accurate domestic audio amplifier of its age.A few years later, in 1953, the product which set the standard for amplifiers was the Quad II Power Amplifier, the time of Queen Elizabeth’s Coronation and the year in which Mount Everest was finally conquered. This amplifier pioneered the principle of cathode coupling through the output transformer to reduce harmonic distortion to almost negligible levels. Such was its clear superiority that this model remained in production for 18 years. Three years later, in 1956, Quad demonstrated the first true full-range electrostatic loudspeaker. This remarkable product (known later as the ESL 57) used a virtually mass-less plastic film as a moving diaphragm between two charged plates. Compared with moving coil loudspeakers, the ESL 57 was free of unwanted colourations and distortions. This landmark product remained in production, virtually unchanged, for 28 years.
Find out more about Quad