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ADCOM PowerAmp GFA-1 - $350 (Reno)
condition:
like new
make / manufacturer:
AdCom
model name / number:
GFA-1
size / dimensions:
8-7/8"W x 6-5/8"H x 10-1/2"D
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Key Specifications & Design
* Power Output: 200 watts per channel into 8 ohms (stereo).
* Circuitry: Uses an internal balanced-bridge design where each channel essentially uses two internal amplifiers tied together, meaning it is not bridgeable by design.
* Cooling: Features an internal cooling fan blowing air through a center heat sink fin configuration.
* Compatibility: Requires a robust preamplifier capable of a 0–10 volt output to drive the amplifier to full power (such as the companion Adcom GFP-1A).
Operational Notes
* Power and Care: Users on audio communities like diyAudio note that the GFA-1 can punch well above its rated output and delivers high amounts of clean power, requiring robust 8-ohm speakers and careful volume management to avoid component damage.
* Internal Layout: Each channel's circuitry and power supply setup are tightly integrated around central heat sinks, requiring proper maintenance given the vintage-era parts and internal cooling mechanism.
Dimensions:8-7/8"W x 6-5/8"H x 10-1/2"D