Adcom GTP-450 (1993)
A stereo tuner preamplifier from Adcom, released in 1993 and designed to pair with high-current power amplifiers.
Overview
The Adcom GTP-450 is a stereo tuner preamplifier, released by Adcom in 1993. It is a preamp and an AM/FM tuner in one box, built to be the central control unit of a high-fidelity system. Adcom engineered it to work with its high-current power amplifiers, and that made it a common pairing in enthusiast setups of the era. One owner's system paired the GTP-450 with a Carver TFM-20 power amp. Detailed performance reviews are sparse, but it has been described as "serious audio equipment" and shows up in multiple user systems from the 1990s and beyond.
Specifications
| Product type | Tuner Preamplifier |
| Production year | 1993 |
| Original price | $500 |
| Frequency response | 20Hz to 20kHz |
| Output impedance | Main Outputs 475 ohms, Tape Outputs 500 ohms |
| Output Level (Rated) | 1.0V |
| Input impedance | 25 |
| Dimensions | 76 x 432 x 292mm |
| Weight | 6.3kg |
| Voltage | 110/120V |
| Power | 20W |
Design
The GTP-450 was engineered as an ideal match for Adcom high-current power amplifiers, which suggests a focus on signal integrity and system synergy.
Market
Used GTP-450 units have sold for prices ranging from $20 for individual preamps to $175 for complete original-owner setups including amplifiers and remotes. A 2020 listing suggested a value of $200. A service manual is available for download.
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