Harman/Kardon PM660

Harman/Kardon A660

October   1 9 8 1 october 1981
February
1 9 8 3 february 1983
1 9 8 5 1985

Part of the mainly-export H/K lineups but the original version, A660, was Japan-only. Built by Shin Shirasuna, of course.
The A660 was silver-only and had only vertical LED dots to identify functions ; the PM660 changed the latter with written backlit descriptions and was available in silver or black depending on the destination market (and black in Japan).

Inside both versions, which are identical, is a very beefy EI trafo, a partly copper-all-over chassis (A660 only !), four rows of black-anodized sharfin heatsinks and a properly isolated phono stage.
Features-wise, this was before CD so there's an MM/MC selector and a four-way capacitance trim acting on both phono inputs ; phono 1 is MM, phono 2 is MM or MC. The "main direct" switch circumvents all but the volume pot and source selector but takes -7dB.
Healthy, reliabe and very powerful.


Nudies of a black PM660 here ; an A660 here.

Harman/Kardon PM660, image 1 Harman/Kardon PM660, image 2 Harman/Kardon PM660, image 3 Harman/Kardon PM660, image 4
Harman/Kardon PM660 specifications
Title Value
Power output : 2x 80W (8 Ohm, 20Hz...20Khz, 0,02% THD)
2x 90W (8 Ohm, 1Khz, 0,02% THD)
1x 400W (8 Ohm, peak)
Power bandwidth : 10Hz...100Khz (half rated power, 8 Ohm)
Frequency response : 4Hz...140Khz (+0 / -3dB)
Rise time : 1,8µs (20Khz, half rated power, 8 Ohm)
Slew rate : 80V /µs (half rated power, 8 Ohm)
Damping factor : > 50
Square-wave tilt : < 5%
Inputs : 135mV / 25kOhm (lines)
2,2mV / 47kOhm (MM)
70µV / 100 Ohm (MC)
S/N ratio : 94dB (lines, A-wtd)
84dB (MM, A-wtd, 5mV input)
74dB (MM, A-wtd, ?µV input)
Maximum phono input : 200mV (1Khz)
5mV (1Khz)
Nominal phono input resistance : 47kOhm
Capacitance trim : 100 / 150 / 200 / 300pF
Bass control : ±12dB (50Hz)
Treble control : ±12dB (10Khz)
Subsonic filter : -3dB below 15Hz
High filter : -3dB above 6Khz
Loudness switch : +10dB @ 50Hz // +3dB @ 10Khz (-40dB)
+5dB @ 50Hz // +1,5dB @ 10Khz (-15dB)
Muting : -20dB
Main direct : -7dB
PC : ?
Dimensions : 44 x 12,2 x 36cm
Weight : 12,5kg.
List price : 105,000¥ (A660 ; 1981)
118,000¥ (PM660 ; 1983)
795CHF (PM660 ; 1984)
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