Integrated Amplifier

The Integrated Amplifier
Building neat, compact integrated amplifiers offering high output power and superb sound quality is an art at which T+A has no peer. As proof of this claim we present the PA 2000 R integrated amplifier. It is incredibly dynamic, powerful, and incisive. There are two reasons behind these characteristics: the extremely linear output stages with very low negative feedback, which are a completely new development, and the new form of mains power supply employed. We designed the latter specifically for audio devices, to ensure that they are ultra-stable under load, with no danger of collapse even when handling extremely high peak levels. The result is that the PA 2000 R can deliver a continuous power of more than 200 Watts per channel into 4 Ohms loudspeakers, enabling it to drive impedance-critical speakers whilst maintaining effortless control.

Technology.
The construction, circuit layout, components, and sub-assemblies of the two R-series integrated amplifiers are identical, but they differ in output power, connection facilities and case size. The input and output sections are equipped with professional sockets (XLR and RCA) made of non-magnetic materials, and all feature hard gold-plated contact surfaces. All sockets are screwed permanently to the solid aluminium back panel. In the R-series the volume control and input select functions are entrusted to sealed gas-tight gold-contact relays, which are not preyed to contact problems caused by corrosion, dust, or ageing effects even after many years of operation. Integrating the relays directly into the circuit allows the signal paths to be as short as possible, and the signals pass from the input sockets to the pre-ampli­fier circuit boards without crosstalk. As an option, input 4 can also be fitted with one of two high-quality phono pre-amplifier modules; they feature different circuit topologies optimised for MM or MC pickups. R-series pre-amplifiers and power ampli­fiers are constructed in accordance with the double-mono principle. This means that we completely isolate the left and right channels from each other – even in mechanical terms – and use identical circuit boards, so that the sound quality of both channels is identical.

Pre-amplifier stage
-Frequency response + 0 / − 3 dB-0,5 Hz – 300 kHz
-Signal: noise ratio, unweighted/A-weighted       105/109 dB
-Total harmonic distortion/Intermodulation-< 0,001 % / < 0,001 %
-Channel separation> 90 dB
-Loudness-Switchable, variable to suit loudspeaker efficiency
-Tone controls
-Bass Treble-Switchable, channel-separate
−6 … +8 dB
−6 … +8 dB
-Nominal input sensitivity           
-High level (RCA3 × 250 mV … 4 Veff/20 kOhms
-Balanced (XLR) 3 × 500 mV … 8 Veff/5 kOhms
-Phono-MM (optional*)
-*Phono module replaces one high-level input    1 – 5 mV,
-16 Capacitances
-Phono-MC (optional*)
-*Phono module replaces one high-level input
-60 – 1000 µV,
-16 Impedances GS