SkyFi Audio - Curators of Vintage Audio Gear

SkyFi Audio is a small startup business specializing in the purchase, reconditioning, and reselling of high end audio equipment. We only buy equipment that we admire and are passionate about. No mid-fi, no gimmicks, no junk. 

Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. If it does not meet or exceed the original manufactures specifications, it will not be sold. We are very selective about the equipment we purchase, focusing on mostly analog, high-build quality, American, and European built units.

Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Project, and Sony ES, we have access to OEM parts, service, and support.

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Super flexible and powerful Lucasfilm THX rated theater amplifier from McIntosh.

6 x 100 Watt amplifier channels in a single chassis!

*Note that a current McIntosh home theater amp will set you back over $7k

You can configure this beast in the following configurations:

• 3 x 300W for 3 channels total

• 4 x 100W and 1 x 300W for 3 channels total

• 6 x 100W for 6 channels total

• 2 x 100 AND 2 x 300 for 4 channels total)

Condition:
The 6 x LED VU meters, not activated in the pictures, are simply gorgeous and very useful. There is also an adjustable display brightness control as shown on the back panel photo in this listing.

This unit, like almost all other McIntosh units, uses a front glass face plate which provides an attractive and very durable finish. The lettering will never show wear.

This particular sample is in super clean condition without any noticiable scratches or blemishes. It has been fully tested in our lab to manufacturer specifications.

It comes in its original McIntosh box and includes an original copy of the owner's manual and a power cord.  

Specifications

ELECTRICAL: Eight channels. 40w/ch into 4 ohms. (100w into 4 ohms mono with 2 channels bridged) Response 20-20kHz (+0 -0.25dB). Distortion 0.005%. Noise and hum -112dBA. Output direct coupled for 4 to 8 ohms. No autoformers. Damping factor 100 or greater. Input impedance 20k. Input sensitivity 1v. Sentry Monitor. Power Guard.

FRONT PANEL: Glass panel. Illuminated. Power Guard lights. Power LED's indicate when each channel pair is active.

BACK PANEL: Output terminals. Audio inputs and outputs. Power control jacks: in and out. Power sw: on or off/remote. THX 25 pin input connector. Level controls: bridged and stereo/mono. Mode sw: bridged, stereo or mono. Multi-room connector. Fuse.

Size 7-1/16"H, 17-1/2"W and 20"D. Weight 48 lb.

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.

Item	Included
Original Box	Yes Included
Manual	Yes Included
Remote	Not Applicable
Cables	Yes - Power Only
Physical Condition	8 / 10
Working Condition	10 / 10

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PURCHASING GUIDELINES:

1) We do not review or accept any offers that do not go through the official eBay system. We have too many items for sale and it is nearly impossible to keep track of offers outside of the official system. Please do not message, email, or text any offers. 

2) All listings are eligible for the eBay Global Shipping Program, unless the item exceeds the maximum weight/price requirements to your country. If this is the case simply message us via eBay as we accept bank wire transfers for international payments and frequently ship worldwide via UPS.

3) Please ensure your shipping address is correct within eBay as we will ONLY ship to the eBay/PayPal Confirmed Shipping Address. No exceptions.

4) eBay may charge and collect sales tax to your state/jurisdiction. Please understand the have no control over this.

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