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Rebuilt by novalux stereophonic:
“Rebuilt - All functions tested - works 100% sounds amazing, very powerful and fast. The face looks beautiful overall but does have a couple small blemishes. There are a few light scratches near the Kenwood logo and LED, there are some dings on the top right edge of the face, and the metal cover could use a fresh coat of paint. Its a little rusted and scuffed up in spots. I left it as is since it has an attractive dark gray speckle texture The presence knob has a small dimple. (See Images)”
Here for sale is a completely rebuilt example of the rare and sought after Kenwood Model 500 Supreme. This is a true dual mono 100WPC design. It sounds as stunning as it looks and the solid milled aluminum knobs give it a feel that simply screams "premium". Its design is full featured yet simplistic. The tone section can be easily defeated. It sounded best ran flat with the attenuator set to 0dB. The variable loudness switch is surprisingly useful. I found myself running it on the "1" setting which adds just a touch of low end punch. The phono stage is well regarded and the original RCA plugs and caution paper are still present on the back panel. Please review the full cosmetic condition description above.
This amp was truly a pleasure to work on. My full rebuild is detailed below. Feel free to message me with questions about the work or the performance of this piece. I had it running on my main rig for over two months.
Power Supply: The Model 500 main power supply board is card based and easily removed for service. All of the electrolytic capacitors and diodes were replaced. Most of the new caps are audio grade Panasonic and Nichicon. Stacked film caps were used for the smaller values. Some trouble transistors were replaced, but the original voltage regulators were kept. A new relay and diode were added to the secondary power supply board. The (4) large filter caps were upgraded from 15,000uF to 18,000uF each. The filter cap terminations were converted to screw on types and bypass caps were added.
Amplifier Boards: All electrolytic capacitors replaces. Trimmers converted to Bourns. Known trouble transistors replaced. New thermal compound applied to drivers. The original Sanken output devices were in good shape and were kept. New thermal compound was applied. Bias and DC offset adjusted to factory spec.
Preamp: The preamp section is made up of (3) boards. All electrolytic caps were replaced. Again audio grade parts were used, mostly Elna Silmic II and Wima stacked film. All controls were cleaned and lubricated with Caig products.
Misc: The original power switch had failed so it was replaced with an equivalent switch with fresh safety caps. The original incandescent lamp has been replaced with a green LED. I will include the original lamp in the box.
Review from The Vintageknob website:
Part of the later, export-only, Supreme series, the Model 500 is essentially a Model 600.
It is in fact the same amplifier, the same circuits, the same parts, the same everything with only less power output, less tape output level on both DIN and RCA terminals, and a 5dB recessed S/N ratio of the power amp section.
Dropped from the Model 600 is the front Phono 1 impedance 3-step switch which is put at the back on the Model 500 and reduced to 2-step ; what takes the place of that front switch is a Phono 2 0...-6dB gain knob.
Otherwise it is the same, therefore just as good, therefore just as excellent : Supreme
RMS power : 2x 100W (8 Ohm, 20Hz...20Khz, 0,08% THD)
2x 110W (8 Ohm, 1Khz)
2x 135W (4 Ohm, 1Khz)
Dynamic power : 520W (4 Ohm)
THD : < 0,08% (rated output into 8 Ohm)
< 0,03% (1W into 8 Ohm)
IMD : < 0,08% (rated output into 8 Ohm)
< 0,03% (1W into 8 Ohm)
S/N ratio : 110dB short-circuited
Power bandwidth : 5Hz...50Khz
Frequency response : DC...70Khz (+0/-1dB)
Damping factor : 50 at 8 Ohm
Inputs : 2,5mV 50 or 100kOhm (Phono 1)
2,5...5mV / 50kOhm (Phono 2)
150mV / 50kOhm (tuner, tape, aux)
Max. input level : 220mV (phono, RMS, 0,008% THD, 1Khz)
S/N ratio : 76dB at 5mV input (phono)
Outputs : tape rec (140mV / 80kOhm)
Din (30mV / 150kOhm)
Frequency response : ± 0,2dB (phono)
Bass control : 400Hz : ± 7,5dB at 100Hz
150Hz : ± 7,5dB at 40Hz
Treble control : 3Khz : ± 7,5dB at 10Khz
6Khz : ± 7,5dB at 20Khz
Loudness (-30dB) : +2 / +4 / +6 / +8dB at 100Hz
Low filter : 40Hz, 12dB/octave
High filter : 8Khz, 12dB/octave
Presence : +6dB at 800Hz
+6dB at 3Khz
PC : 790W at full power
Dimensions : 44 x 15,4 x 38,8cm
Weight : 20,2kg.
This ad was originally posted on US Audio Mart.