JVC 4VR5436

1 9 7 4 1974
1 9 7 5

Large receiver prepared for the surround, surrounding and surrounded future : CD-4 4-channel for records, CD-4 4-channel for FM, S.E.A. equalizer and 5-position mode for a sea of sounds coming one direction, many directions or any other directions.

A sizeable transformer, two 5800µF / 35V caps, OCL circuit and two pairs of output transistors make the power section.
Even if the literature says it multiplies output by four, the amplifier really is a 2-channel amp divided by four when used for 4-channel replay (and therefore BTL mode).

The preamp section is mopre complex, CD-4 oblige.
Even if the CD-4 Radar lights up when a CD-4 source is used, with Mono, 2CH, Discrete 4CH, Matrix 1 and Matrix 2 modes... I'm already lost !

The balance and volume controls allow balancing and "voluming" the front and rear speakers, just like the headphones' output are doubled for 4-channel-compatible headphones (such as the Koss Phase/2+2) and the tone controls are doubled with basic bass/treble for the rear and 5-band S.E.A. equalizer for the front.

CD-4 sounds possibly crawling everywhere, the third tape i/o takes the shape of an added DIN socket labeled "front" (but where do the rear signals go ?)

Hidden at the back, the CD-4 phono input has three pots to adjust separation (left), separation (right) and 30Khz level for a lot of (blind) fiddling between CD-4 cartridge adjustment, front/rear and left/right balance(s).

The FM section has a FET front-end, 3-gang varicap, and two ICs and 3-resonator mechanical filters in its IF section ; MPX is also IC-based.

This banal (for 1974) FM section nevertheless has an FM detector output, should CD-4 broadcasts begin in the near future, in the future or sometime around 2025.

A september 1974 test / review of the VR5436 at gramophone.

JVC 4VR5436, image 1 JVC 4VR5436, image 2 JVC 4VR5436, image 3
JVC 4VR5436 specifications
Title Value
Total dynamic power : 4x 27,5W (110W, 8 Ohm)
4x 35W (140W, 8 Ohm)
RMS power at 1Khz : 4x 17W (68W, 8 Ohm, 1Khz, all channels driven)
4x 18W (72W, 8 Ohm, 1Khz, all channels driven)
BTL power : 2x 34W (68W, 8 Ohm, 20Hz...20Khz, IHF)
RMS power : 14W / channel (8 Ohm, 20Hz...20Khz)
14W / channel (4 Ohm, 20Hz...20Khz)
THD : 0,8% (aux input, for rated power)
IMD : 1,0% (aux input, for rated power)
Frequency response : 20Hz...20Khz (aux input ; ± 1dB)
Load impedance : 4...16 Ohm
8...16 Ohm (BTL)
PREAMP section PREAMP section
S/N ratio : 65dB (phono)
75dB (aux 1)
75dB (aux 2)
75dB (tape play)
Inputs : 1,5mV phono
200mV aux 1 (4CH)
200mV aux 2 (4CH)
200mV tape mon (DIN 2CH)
200mV tape mon (RCA 4CH)
Outputs : 30mV tape rec (DIN 2CH)
200mV tape rec (RCA 4CH)
SEA section SEA section
Front center frequency : 40 / 250 / 1k / 5k / 15k
Front control range : ± 12dB
Rear bass control : ± 10dB at 100Hz
Rear treble control : ± 10dB at 10Khz
Loudness control : +12dB at 50Hz
+6dB at 10Khz
Low cut filter : -10dB at 50Hz
High cut filter : -10dB at 10Khz
Crosstalk : 50dB at 1Khz
FM section FM section
Tuning range : 88MHz...108MHz
Usable sensitivity : 2,0µV (IHF)
THD : 0,5% mono (400Hz, 100% modulation)
0,8% stereo (400Hz, 100% modulation)
S/N ratio : 65dB
Selectivity : 65dB (IHF)
Capture ratio : 2dB (IHF)
Image rejection : 55dB
Stereo separation : 35dB
Frequency response : 20Hz...15Khz (± 1dB)
AM section AM section
Tuning range : 525Khz...1605Khz
Usable sensitivity : 30µV , 200µV/m
Image rejection : 45dB
General General
PC : 170W
Dimensions : 50,8 x 16,3 x 39,1cm
Weight : 14,3kg.
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