ADCOM GFA-545(II) Power Amplifier
Audio upgrading of the classic ADCOM GFA-545(II) stereo power amplifier is available. This robust amplifier is capable of operating into very low impedance or difficult speaker loads due in part to its high current design. It is based on a triple Darlington configuration and uses no protection or current limiting circuitry other than the fuses used in the DC power supply voltage rails. For highest performance sound, it is essential that the highest quality audio grade parts be used otherwise ultimate sound quality will be compromised. We offer what we feel is the most comprehensive and sensible upgrade available today.
As part of our upgrade modification process, we will:
Replacement of main power supply capacitors $100
IEC rear AC power connector installation is available $129
Non-working amplifiers sent in for modification will incur additional repair charges.
Manufacturer’s specifications: 100 watts RMS minimum per channel into 8 ohms or 150 watts RMS into 4 ohms at less than .04% THD; Frequency response: 1.7 Hz ~ 100 kHz +0/-3dB; S/N ratio: >110dB (A-weighted); Dynamic headroom: 2.1dB; Damping factor: >400.
ADCOM GFA-545 Series II Amplifier Improvements Over Original Version:
Larger potted AC power transformer provides better overall regulation and greater peak-current capability.
No electrolytic capacitors in the signal path or feedback-loop path - only non-polarized capacitors are used.
Addition of a servo circuit minimizes DC offset voltage at the speaker output terminals.
Larger rear heatsinks for greater heat dissipation, better temperature and dynamic bias tracking insuring greater thermal stability.
Additional cooling vents on top cover and chassis for greater cooling efficiency and cooler operation into lower or difficult impedances.
High-quality gold plated brass RCA phono input jacks with teflon insulators.
Upgraded 5-way binding posts for speaker terminals.
Thermal overload LED indicator on front panel.
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