Fabricat intre anii 1981-1982
Greutate 8.1 kg
Consum de la retea: 460W
Cateva date tehnice culese de pe net, din pacate nu am reusit inca sa gasesc manualul:
Direct-coupled class A amp 2x40W (both channels driven)
THD @ rated power 0.007% (8 Ohms)
@ 50mW 0.08% (4 Ohms)
Intermodulation distortion 0.007% 60Hz:7kHz 4:1 SMPTE (8 Ohms)
Power bandwidth (both channels driven) 5Hz-30kHz (3dB)
Damping factor (8 Ohms) 40
S/N 100dB (IHF A-weighted) Tape/Tuner/Aux
82dB (IHF A-weighted) Phono
Freq. Response 2Hz-100kHz (-3dB) 20Hz-20kHz (0 dB)
Channel separation 55dB @1kHz
It has neat things like separate record and input selectors so you can record off the radio whilst listening to a CD, for instance. It also features overload and DC input-bias protection - the protection circuit operates a relay in the output so it disconnects the speakers if needed and it won't connect them until the output has no DC (also stops any thumps when switching on).
The whole thing is very neatly made and well thought out - there's no mass of internal wiring and the selector switches are physically at the back, near the sockets, for short signal paths. They're remote-controlled from the front selectors with a kind of flat cable rack-and-pinion arrangement.
Pret: 380 ron
Si oarecum offtopic dar mi-a placut cum este explicat, comparatia intre cum se masura in anii aceia puterea unui amplificator si cum se masoara in zilele noastre Altfel spus, de ce sunt trecute puteri nereale si bombastice pe panourile frontale, posterioare si laterale ale receiver-elor de pe piata:
Because 35 watts/channel as specified by Marantz in the 1970's meant...
" The unit can deliver 35 watts into 8 ohms for one hour, from all channels at the same time, with no significant change in distortion, or other specifications, at any time during, or after, the test hour."
...while 100 watts/channel today (for instance, in my JVC surround system) means...
" The unit can deliver 100 watts for a fraction of a second, in one channel only, if the other channels aren't running and nothing else high energy has happened to drain the power supply of stored energy in the last few seconds."
In fact, my JVC 5-channel Dolby surround receiver claims 500 watts RMS, but the power consumption label on the back panel tells the story:
If my JVC receiver was 100% efficient, meaning that every bit of power it took from the wall was delivered to the speakers as audio power (which it isn't), that'd give you only 64 watts a channel, about 2/3rds of the claimed power rating (which is 100 watts per channel, remember, 500 delivered as 100 per each of the five channels.)
But since the receiver can only (at best) convert about 50% of the available energy to the speakers, and the available energy is what is left over after the heat is generated (did I mention that this model JVC runs almost too hot to touch on top, even when making no sound at all?) and the watts that go to lighting the panel and powering all of the other circuitry are accounted for, the system can perhaps, when brand new, on a good day, generate 32 watts a channel continuously with all the channels going, which is pretty sorry compared to the claimed 100 watt per channel rating. That is less power per channel than an old 2235 receiver. Shocking, eh?
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