Country of Manufacture:Japan
Release dates:1982 - 1986
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 10.5"
Number of heads: 4
Head Composition: Permalloy
Head Configuration: Stereo
Frequency Response:( 3dB): 7½ ips: 25Hz to 33kHz
Wow and Flutter:less than 0.03% WRMS at 7½ ips, less than 0.04% WRMS at 3¾ ips
Signal-to-Noise Ratio:better than 65 dB at 7½ ips (dbx OFF)
Sound quality rating:7 / 10
Long-term reliability rating: 8 / 10
The GX-747dbx was the successor
to the GX-747 with the addition of a
dbx decode-encode system. Also, instead of the LED bar meters, the GX-747dbx
reverted back to more conventional VU meters. This could have been partly
due to economy. The 747dbx was intended to replace rather than be a more
deluxe version of the 747 and both dbx and LED display may have pushed
the price up too much.
The dbx type I NR widely expanded the dynamic range of the tape. Apart
from this and the VU meters, the 747dbx was almost identical to the 747.
Recording input controls had a memory marker ring (like the GX-646)
and remote control was available as an optional extra.
Like the GX-747, the GX-747dbx was available in either black or silver
Distortion: less than 0.4% at 7½ ips / Dynamic range: 128 dB (dbx switch: ON, 1 kHz, peak recording level) / Rewind speed: 75 seconds for 1200ft / Inputs: mic: 0.25mV impedance 600 ohms, line: 70mV 100 ohms / Outputs: line. 410 mV. headphone: 1.3 mW / Dimensions: 17.3 x 19.4 x 10″ (440 x 493 x 256mm) / Weight: 51.0 lbs (23.2kg) / quarter-track stereo
Overall a pretty good sounding tape recorder. Not one of my best. Reasonably reliable but as required servicing twice in the last decade.