HARMAN KARDON hk670 TWIN-POWERED DC RECEIVER (1979)

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  • Item Category: Tools
  • Source: eBay
  • Sold Date: May 04,2011
  • Channel: Online Auction
Not just a vintage receiver. A restored work of vintage art.
There are probably less than 5 units of this model ... in this condition ... anywhere.
The hk670, the top-of-the-line for HK in 1979 and most powerful receiver HK built to-date, featured a post-modern, industrial exterior design. The first full series manufactured completely in Japan, HK used this design for the run of this series only and it looks nothing like the USA-made "x30" series that preceded it or the lower-profile Japanese-made "i" series that followed it. Originally rated at 60 watts per channel RMS driven from 20-20,000 kHz into 8 ohms with less than 0.08% total harmonic distortion (THD), it had an extremely clean sonic presentation. Following the fall 2010 complete restoration and rebuild by Mark Wilson at Absolute Sound Labs of Minneapolis, its power output improved to 70 watts per channel at similar impedance and it sounds better today than it did the day it was built. It has an excellent tuner section with outstanding stereo separation. It is essentially a hand-made 2010-parts receiver in the body of a near-mint vintage unit. The exterior and faceplate are in excellent condition with only a couple of minor blemishes, including a slight, crescent-shaped mark in the faceplate between the "Balance" and "Treble" knobs (see photo). It could not be entirely rubbed out without risking damage to the entire faceplate and so it was left as-is. It does not detract from the rugged appeal of the unit. I would rate it a 9.5 out of 10. Owner's Manual in PDF file form and restoration invoice/receipt from Absolute Sound Labs will be provided to buyer.
One element of the hk670's design that I much prefer is that the analog tuning display is always lit when the receiver is powered up, regardless of which function is in use. Featuring a black field and reverse-illuminated dial instrumentation (see main photo above), the subdued lighting of the analog dial does not present a distracting amount of light from the receiver when placed beneath a flat-screen TV, while still allowing the user to easily see the control panel when making adjustments.
The "Tape Copy" function which controlled dubbing from one tape deck to another while listening to a different source (a common task back in 1979, but relatively useless today) was not repairable. This does not affect the normal operation of the receiver, only the described function of tape deck dubbing. Other than that feature, the entire internal construction of the receiver has been restored to better-than-new including:
All electrolytic caps replaced with new Panasonic FC or Nichicon series capacitors Power supply updated with more robust semi-conductors Main filter capacitors were checked and met factory performance Filter capacitors in the power supply regulator and sub-supplies replaced with updated components All control switches cleaned and lamp bulbs replaced Complete AM/FM multiplex alignment to factory specifications Dial pointer mechanically aligned Faceplate and panel assemblies poly-coated to prevent typeface deterioration Entire unit completely cleaned and tested following restoration burn-in This unit is currently in daily use and provides plenty of powerful, clean outstanding sound for CD's, DVD's, TV and FM Stereo. Located in an urban setting, the FM reception is very clean and quiet.
I also have a Technics 85 WPC receiver for sale HERE
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MORE BIG PHOTOS AT THESE LINKS:
FRONT FACEPLATE: Front Faceplate LEFT FACE: Left Faceplate BACK PANEL: Back View BACK LEFT: Back Left
BACK RIGHT: Back Panel Right Side INTERNAL--TOP VIEW: Internal Top View INTERNAL--BOTTOM VIEW: Internal Bottom View
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Unit will be care...

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