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Technical Details

Brand: Technics

Model:RS-1500

Category:Super High Fidelity

Application:Consumer

Electronic:Solid State

Country of Manufacture:Japan

Release dates:1977 - 1981

Original Price: $1450

Tracks:1/2 Rec/Play+1/4PB

Speeds: 3 3/4, 7 1/2, 15

Max Reel Size("): 10.5"

Number of heads: 4

Dimension: 18 x 17.5 x 10.25" (456 x 446 x 258mm)

Head Composition: Sendust

Head Configuration: Stereo - Stacked

# Motors: 3

Auto Reverse?:No

Voltage(s): 100v Japan, 110-120v, 220-240v

Frequency Response: 30Hz - 30kHz at 15 ips +-3dB

Wow and Flutter:0.12% at 3¾ ips .04% at 7½ ips. .02% at 15 ips

Signal-to-Noise Ratio:60 dB NAB

Sound quality rating:7 / 10

Long-term reliability rating: 9 / 10

Weight: 57.2 lbs (26kg)

Additional Details

Description

Perhaps trying to make up for lost time and to show that Technics was in fact a real contender in reel to reel tape recorders, they released 7 models, starting in late 1977 and the remainder in 1978. The RS-1500 came fiirst and shortly thereafter the RS-1506, RS-1520, RS-1700, RS-1800, RS-10A02 “R&B Series”

The RS-1500 is a half track Record/Play with switchable quarter track head using the RP-2224 headlock. It has the  Isolated Loop tape path developed by Technics with really low wow and flutter (.018%) that also keeps down modulation noise.
A a very smooth and stable tape path using a large 34mm capstan and 2 pinch rollers combined with an electronic tension control system completes this transport. Tape tension on the Isolated Loop tape path is low compared to many other machines, so for those using older tapes with rippled edges, this may not be the  ideal.

A Quartz-Locked Direct-Drive Capstan Motor completed the well-designed assembly.
Logic controlled electronic braking, which applies reverse torque to the motor prior to deploying a mechanical brake, results in very smooth transition between function selections and virtually no tape stretch.
Control functions included a three position speed control, remote timer, start, meter sensitivity, mike attenuator, source tape monitoring (separate for each track), three switch positions for bias and equalization, record track selection levers, and a tape counter indicating minutes and seconds at 38cm/s per second 10½ ”
Two good quality VU’s were fitted, but transients still under-read appreciably and no peak indicators were supplied.  The recorder could also be used with a 24V DC power supply.

Additional Info

Year 1977
Price When New  US $1450 – UK £1000- Australia $1500
Track System Half-track stereo (with addition quarter-track playback head)
Heads (4) erase, half-track record and playback, quarter-track playback
Motors 3 electronic governed DC motors
Maximum Reel Size 10½ ”
Frequency Response (3dB)
3¾ ips (9,5 cm/s) 20-15.000 Hz
7½ ips (19 cm/s) 20-25.000 Hz
15 ips (38 cm/s) 30Hz – 30kHz
Wow & Flutter
3¾ ips 0.12%
7½ ips 0.04%
15 ips 0.02%
Signal to Noise Ratio (NAB weighted)
3¾ ips 64 dB
7½ ips 66 dB
15 ips 68 dB
Rewind Speed 2 mins 15 seconds for 3600ft on 10½ ” reel
Stereo Separation better than 50dB
Harmonic Distortion 0.8%
Erase Ratio -68.5dB
Inputs  mic 0.25 mV, 4.7 Kohm (jack plug)
Line  60 mV (phono plugs)
Outputs  600 mV (phono plugs)
Dimensions 18 x 17.5 x 10.25″ (456 x 446 x 258mm)
Weight  57.2 lbs (26kg)
Optional Remote Controls  RP-9690 Wired – RP-070 Wireless

Technics isolated loop system

The Technics single capstan system offered advantages over double capstan as variations in the speed of two capstans and the pressure of the two pinch rollers to maintain the desired temp tape tension makes speed and tension adjustment complex and difficult often increasing the tape tension which is not desirable. The relatively long distance between the two capstans over which the which the tape must stretch contributes to higher modulation noise and scrape flutter. In contrast the Technics single capstan system maintains exactly the same speed and pinch roller pressure on both sides of the capstan. The wide contact area between the pinch rollers and the single extra-large capstan allows for lower tape tension, about 80 g and very steady because the tape path between the capstan and the reversing roller is relatively short. So modulation noise, wow & flutter and level fluctuations are dramatically reduced. Add to this the quartz locked slow speed direct capstan drive system, aided by tension controlled direct drive reel motors and air dampened tension rollers  the Technics isolated loop system achieves excellent overall performance.

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