The REVOX G36 also known as model 736 is a mono/stereo machine with stacked erase heads, separate recording heads separate replay heads, six audio pre-amplifiers. and a push/pull power amplifier. Tape speeds of 3 3/4 and 7 1/2 .i. p. s. are obtained by pole-changing the synchronous Papst capstan motor. Twin-track and four-track models are available, both fully stereophonic, recording to the latest C.C.I.R. (DIN 45113) characteristic.
Switched inputs are provided on each channel for mic, radio, or diode, and separate channel gain controls enable recordings to be independently of one another in the stereo mode. Alternatively, one channel can be set to playback whilst the other channel is recording, and all forms of duoplay and multiplay are possible. Furthermore, mixing arrangements provide for both pre-amplifiers to be coupled to the same channel, with neither gain control acting a master. Thus any two signals may be mixed and recorded simultaneously in the mono mode. Two V.U. meters calibrated + 3 to 20 v.u.'s as per A.S.A. standard, are set 6 db. above constant tone to permit accurate register of signal peaks. The mono power amplifier of the REVOX gives an output of 6 watts at less than 1% distortion, and its input may be switched to monitor either or both tape replay amplifiers or the incoming signal on either channel. The same control switches the signal to one of the two sets of cathode follower outputs ( B ), located on the rear connecting panel, designed to feed external high quality amplifiers.
REVOX provide three ring - core heads on all models. thus permitting optimum performance to be obtained. Each head is beautifully engineered, and in bonded in Araldite to prevent the laminations from moving. due to jarring or heat with a resultant lose of high frequency response. In addition the record and replay heads are placed in screening cans with a face shield covering the front of the replay head when the machine is running. The heads are now mounted on a head block casting, which is integral with the motor casting above the baseplate. The tape is held against the heads by the use of pads but in the professional manner of arranging the heads in an arc. Result - less friction on the tape and much reduced and more even head wear. An end-of-tape stop is ingeniously provided during all functions, with or without the use of stop foils. The machine also stops should the tape break or the mains fail momentarily, but a plug-in relay and delay circuit serve to avoid unintentional stoppages.
Your assurance against wow and flutter, now or later, is the huge Papst Hysteresis - Synchronous capstan motor with external rotor directly coupled to a dynamically balanced flywheel by means of a special anti-vibration rubber disc (as shown in figure 1). This effectively damps out all but the barest traces of flutter and permits piano recordings to be made at 3 3/4 i. p. s. in absolute safety. The motor is now carried in a new casting to reduce any ringing noise. Two smaller Papst outer rotor motors are employed for fast winding and tensioning and a slight back tension is retained during winding. So smooth is this operation that you can actually switch from right to left (or vice versa) on fast tape handling - no tape snatch no tape spill no breakage. The braking is mechanical with electrical control. Consequently braking in efficient precise and immediate; so the REVOX always fails 'safe' with any tape. The use of solenoid control throughout provides for effective remote control, and the machine may be started or stopped in the record or replay functions at any distance.
|Tape speed||3 3/4 and 7 1/2 ips, pole-switching capstan motor, direct drive (motor may be switched off, if recorder is used as an amplifier)|
|Flutter and wow||below ± 0,1% at 7 1/2 ips|
|Rewind time||approx. 80 seconds of a 2400 feet reel|
|Max. reeldiameter||up to 25 cm (10 1/2")|
|Frequency response||40 - 15'000 cycles at 7 1/2 ips +2/-3 db
40 - 12'000 cycles at 3 3/4 ips +2/-3 db
|Equalization||in accordance with CCIR standards.
70 micro-seconds at 7 1/2 ips.
140 micro-seconds at 3 3/4 ips.
|Signal to noise ratio||Better than 52 db at peak record level (2 track)
Better than 50 db at peak record level (4 track)
|Dynamic range (overall)||2-track recorder:||55 db at 7 1/2 ips|
|53 db at 3 3/4 ips|
|4-track recorder||52 db at 7 1/2 ips|
|50 db at 3 3/4 ips|
|Crosstalk||Mono 55 db||stereo 40 db|
|Oscillator-bias frequency||70'000 cycles,||push-pull oscillator|
|Inputs per channel||1. microphone||= 1 Megohm, 3 mV|
|2. Radio||= 1 Megohm, 50 mV|
|3. Diode||= 47 K'ohms, 3 - 50 mV, adjustable|
2 cathode-follower outputs, impedance = 5'000 ohms (input impedance of amplifier to be connected should be higher than 100'000 ohms.)
1 loudspeaker output 5 ohms, 6 watt Push-pull power amplifier, internal speaker may be switched off.
|Tube complements||4 x ECC 81, 1 x ECC 82, 5 x ECC 83, 2 x ECL 86, 1 x EM 801,
3 diodes, 3 selenium rectifiers
|Power line voltage||110, 240 volts, 50 cycles|
|Power requirements||approximately 120 watt|
|Fuses||for 220-240 volts: 0.6 Amps) 5 x 20 mm slow-blow
for 110-145 volts: 1,2 Amps) 5 x 20 mm slow-blow
|All these data are valid for the 2-track as well as the 4-track recorder, unless noted otherwise.|
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