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GAS (Great American Sound Company) Son of Ampzilla Amplifier

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Pickup currently unavailable at SkyFi 479

Gas (Great American Sound Company) Son Of Ampzilla Amplifier

GAS (Great American Sound Company) Son of Ampzilla Amplifier

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


Featuring Gorgeous BIG analog meters, backlit in a warm yellow hue for a great vintage look to go with the big sound.

Super simple circuit design capable of delivering that full vintage sound.

This amplifier was serviced by Analogique in 1998.

On initial testing we were surprised at how well the amp tested, delivering rated power with ease, with near perfect channel balance.

We made minor adjustments to the DC Offset and Bias to original manufacturer specs, and calibrated the meters.

All four meter lamps were also replaced, along with the power indicator LED. (4) extra lamps are included with your purchase for future replacement.

Lightly serviced and ready to perform!

GAS (Great American Sound Company) Son of Ampzilla Amplifier Manual


80 Watts Per Channel Into 8 Ω (Stereo)

Frequency Response
20Hz to 20kHz


Input Sensitivity

Signal to Noise Ratio
100 dB

Speaker Load Impedance
4 Ω to 16 Ω

16.25" W x 5.25" H x 11" D

25 lbs.

Years Produced
1977 - 1978

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



Original Box







Yes - Power

Physical Condition


Working Condition


SKU: 102103