The Accuphase P-600 Power Amplifier is one B-I-G mother of an amplifier. Come with me as I complete a post-purchase inspection and voltage conversion on this one.
Anyway, I’m not complaining, I LOVE working on equipment like this, even if it is heavy and the work slow. The Accuphase P-600 was, as far as I recall, Accuphase’s best class-A/B stereo power amplifier back around the early ’80s. There were class-A amps which were more expensive and the ridiculous M-100 monophonic power amps, but as far as stereo class-A/B amps go, this was king of their hill.
The P-600 produces 300 watts per channel into 8 ohms and much more into lower impedances. It weighs in at 38.5kg and this one even has the optional and gorgeous persimmon wood side panels. It’s superbly well-built, typical of Accuphase. The P-600 also has some useful features like digital power output meters, stepped attenuators and lots of protection.
Accuphase P-600 Specifications
Courtesy Audio Database.com
|Type||Stereo power amplifier|
|Continuous average power|
(20 Hz to 20 kHz
Strain rate 0.02%)
|Stereo specification Normal Load Imp. Operation:700W/ch (2 Ω)|
500W/ch (4 Ω)
300W/ch (8 Ω)
150W/ch (16 Ω)Low Load Imp. Operation:450W/ch (1 Ω)
300W/ch (2 Ω)Monaural specification Normal Load Imp. Operation:1400W (4 Ω)
1000W (8 Ω)
600W (16 Ω)Low Load Imp. Operation:900W (2 Ω)
600W (4 Ω)
|Total harmonic distortion factor||Stereo :0.02% (1 Ω ~ 2 Ω)|
0.01% (4 Ω ~ 16 Ω)Monaural specification :0.02% (2 Ω ~ 4 Ω)
0.01% (8 Ω ~ 16 Ω)
|IM Distortion Factor (EIA)||0.01%|
|Frequency characteristic||20 Hz ~ 20 kHz + 0 -0.2 dB (Continuous Average Output, Level Control MAX)|
0.5 Hz ~ 250 kHz + 0 -3dB (at 1W Output, Level Control MAX)
0.5 Hz ~ 150 kHz + 0 -3dB (Level Control -6dB at 1W Output)
|Gain||27.8 dB (stereo specification)|
33.8 dB (monaural specification)
|Load impedance||Stereo specification : 1 Ω ~ 16 Ω|
Monaural specification : 2 Ω ~ 16 Ω
|Stereo specification: 300|
Monaural specification: 150
|Input sensitivity||Stereo:2.0 V (8 Ω, 300W, Normal Load Imp. Operation)|
1.0 V (2 Ω, 300W, Low Load Imp. Operation)Monaural specification:1.83 V (8 Ω, 1000W, Normal Load Imp. Operation)
0.91 V (2 Ω, 900W, Low Load Imp. Operation)
|Input impedance||20k Ω unbalance|
600 Ω equilibrium
|S/N (A correction)||Stereo:125 dB (Input Short, 8 Ω, Continuous Average Output, Normal Load Imp. Operation)|
100 dB (Input 1k Ω, 1W output, EIA)Monaural specification:118 dB (Input Short, 8 Ω, Continuous Average Output, Normal Load Imp. Operation)
90 dB (Input 1k Ω, 1W output, EIA)
|Subsonic filter||10 Hz, -12dB/oct.|
|Output meter||Type: 3-digit Digital Display, Peak Direct Reading TypeDisplay Range: 0.001W ~ 999W|
|Semiconductor used||Transistor: 90 Nos.|
FET: 8 Nos.
IC: 36 Nos.
Diode: 104 units
LED: 8 pcs
|Power supply voltage||AC100V/117V/220V/240V, 50Hz/60Hz|
(Normal Load Imp.
|165W (no input)|
1100W (Electrical Appliance and Material Control Law)
1100W (at 8 Ω load, rated output)
|External dimensions||Width 480x Height 232 (Including Legs) x Depth 476 mm|
|Sold Separately||Persimmon / Wood Panel A-14 (Set with mounting bracket, ¥ 16,000)|
Heat Dissipation Fan O-81 (set, ¥ 8,000)
This unit came in for a post-purchase inspection, voltage conversion, a new mains plug and recommissioning on local voltage. Her owner purchased her from Japan, a location where 100V line voltage is standard. Naturally, he wanted her converted to 240V operation, carefully tested etc. before flicking the switch. Very sensible customer. The inspection also means that I can catch anything that isn’t as the owner expected in the form of a professionally written report.
Note that this conversion and recommissioning isn’t a simple flick of an internal switch. Anytime you work on a complex, rare and expensive amplifier like this, you go slowly. Even more so when changing primary side transformer taps, because one mistake, one slip-up if you were rushing for example and the thing would ash itself at turn-on.
Inside the Beast
Let’s face it though, you don’t want to hear me rabbiting on, this is what you’re really here for…