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TEA1 Series 3 Phono Preamplifier
The TEA1 Series 3 triode equalization amplifier is a stand-alone vacuum-tube phono stage designed to satisfy the expectations of the most demanding music lovers.
The TEA1s3 features a zero loop feedback circuit with passive RIAA equalization. It offers two phono inputs, one with switch selectable resistive and capacitive loading allowing the user to fine-tune performance to the chosen phono cartridge. The other input is fitted with premium wide-bandwidth audio transformers installed on the PHONO 1 input to provide the higher gain and very low noise required by low output moving coil cartridges. Designed to precisely track the prescribed RIAA equalization curve, the TEA-1s3 assures absolute tonal accuracy. The low-gain audio circuit of the TEA-1s3 is comprised of two cascaded single-ended triode amplifiers. The circuit is a zero-feedback design, to eliminate the temporal inaccuracies that negative feedback introduces. RIAA equalization is established by a passive network between the two gain stages. Careful implementation of this fundamentally simple circuit results in extremely wide bandwidth and low distortion, without resorting to negative feedback.
Like the GATs2, the upgraded TEA1s3 benefits from improvements to the main audio power supply and increased capacitance.
The TEA1s3 is equipped with two phono inputs, one a direct input with 54 dB of gain and variable resistive and capacitive loading, the other fitted with premium step-up transformers for low output cartridges, to provide an overall gain of 66 dB. The TEA1s3 is optionally available as the TEA1s3b without the step-up transformers, having instead two direct inputs, one with variable loading and one with fixed loading.
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