The Imperial
II records directly onto disc from a variety of program sources - AM and FM
radio, tape, live performances and record to disc. The equipment is housed in 2
portable vinyl-covered cases. Rek-o-Kut's SPK-44 may be used with the Imperial
II for general sound amplification or playback.
The Imperial
II consists of:
Model TR-43H
: Three-speed recording turntable
Model R8B
: new 20 watt, low noise, transitorized
recording amplifier.
Model M-12S
: Overhead lathe
Model RH-5
: Newly designed wide range recording
head.
Model S-120
: High fidelity tonearm.
Recording
amplifier Model R8B offers the following advantages:
A compact
and versatile combination of three separate transistorized preamplifiers and
20-watt power Amplifier.
Choice of
mixing or separate use of three outputs from Microphone, Tape and Phono
Preamplifiers, as desired.
Specially
designed tone controls for exact compensation of recording equalization or
playback.
Individually
selected, low-noise transistors for low signal-to-noise ratio in recording and
playback.
Specifications
of Imperial II
Record Cutter and Playback Unit
Motor: Hysteresis Synchronous motor fitted with
lamitex drive pulley. Suspended in shock mounts to prevent transmission of
motor vibration.
Recording
Area: Records from 6" up to 13¼"
Speeds: Simple, finger-tip speed control. Records at both 33⅓
and 78 rpm. Includes idler and adapter for 45 rpm recordings
Overhead
Recording Lathe: Model M-12S Lathe.
Hand Crank
for run-in and run-off spiral grooves.
Provision
for Interchanging leadscrews for Standard and Microgroove.
Equipped
with standard 120 line leadscrew, Liftomatic Safety Cam prevents double cutting
stylus damage. Automatically raises cutter as center of disc is approached.
Calibrated
Scale for Timing
Recording
Head: Model RH-5 response from 30
-13,000 Hz
Playback
Arm: Model S-120 for records up to 13¼" - with magnetic cartridge
Recording Amplifier Unit - R8B
Output: 20 watts
Response: 20 to 20,000 Hz ±2 dB (at full output)
Harmonic
Distortion: 0,32% at 1,000 Hz (at full
output)
Intermodulation
Distortion: 0,8%
Hum Level
(below rated output):
Tape : 60 dB
Mike : 64 dB
Phono : 61 dB
Inputs: Microphone; Tape and Phono (mixing); Tuner
(high level)
Preamplifier
sections completely transistorized
Mike Preamplifier
Input
Impedance: 10,000 Ω
Sensitivity: 3,25 mV
Power
gain: 102 dB
Distortion:
less than 1%
Noise: -65 dB below rated output
Tape Preamplifier
Input
Impedance: High impedance head
Sensitivity: 2,17 mV
Power
Gain: 104 dB
Distortion: less than 1%
Frequency
Response: 50 to 15,000 Hz ±2 dB,
equalized for NARTB
Noise: -55 dB (below rated output)
Phono Preamplifier
Input: magnetic, high impedance
Sensitivity: 4,75 mV,
equalized for RIAA
Power
Gain: 99 dB
Distortion: less than 1%
Noise: -59 dB (below rated output)
Tuner
Input: Accepts all std. AM and FM Tuners
Controls:
Phono,
Microphone and Tape Level;
Master
Volume;
Bass Control
(±22 dB at 50 Hz)
Treble
Control (±20 dB at 15 kHz)
Playback-Recording
switch;
Power
switch.
Recording
Level Indicator: Damped volume unit type
meter with special calibrated scale.
Outputs:
Speaker and
Cutter (16, 8 and 4 ohms);
Monitor (for
use with high impedance headphones);
Pre-amp
(2,000 Ω).
Tubes: 2 - 6973; 1 - 6AN8
Transistors: 3 - 2N408; 5 - 2N 406
Rectifiers: 1N2071 Silicon
Powe
Requirements: 115 watts; 117 V AC, 50/60 Hz
Leatherette
covered carrying cases with storage lid and handle.
Dimensions
(W x H x D)
R8B
Amplifier : 20½ x 7 x 10 inches
Recorder
: 20½ x 14 x 18 inches
Weight:
R8B : 25 lbs
Recorder
: 45 lbs