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Dynamic Noise Limiter (DNL)

The Sanyo RD 4025 is a stereo cassette deck with DNL noise reduction, it was introduced by Sanyo in 1976.

The main features of the Sanyo RD 4025 are: 2 heads, analog 3 digit tape counter, manual tape type selection with support for normal and chrome tapes, belt driven single-capstan transport.

Typical of this deck is the 70's top loading layout with the cassette compartiment located on the left side of the deck. Tape eject is operated mechanically and the cassette needs to be placed with the side to be played facing forward in the cassette well.

Level meters used on the RD 4025 are analog needle VU reading meters. Mechanical transport controls for reliable RD 4025 transport function selection.

Unlike the various Dolby systems, which require encoding and decoding, the Dynamic noise limiter (DNL) used by Sanyo in the RD 4025 works on playback only and reduces noise by as much as 10 dB.

To make live recordings this deck has 2 microphone inputs to connect microphones with a jack connector. For undisturbed listening a jack connector for a pair of stereo headphones is supplied. Connection to other audio components for plaback can be achieved by a RCA cable and recording from a source by a RCA cable.

Compact Cassette
  • Dynamic Noise Limiter
  • Auto Stop System

Historic events

1976 Steve Jobs and Steve Wozniack incorporate the Apple computer company.

Features of Sanyo RD 4025

Connectors
Connectivity
2 Mono Microphone Inputs RCA Input/Output Connectors DIN Input/Output Connector Headphones
Display
Display
3-Digıt Mechanical Counter Analog Needle Meters
Cassette Exterior
Exterior
Orientation Left Top Loading
Compact Cassette
General
Stereo
Head
Head Configuration
2 Head Desiǥn 4 Track / 2 Channel
HighCom NR
Noise Reduction
DNL Noise Reduction
Controls
Operation
Mechanical Transport Control
Power
Power Requirements
Alternating Current
Preamplifier
Preamplifier
Individual Input Level Controls
Tape Speed
Speed
1⅞ ips - 4.76 cm/s
Tape
Tape
Normal Tape Capabılity Manual Tape Type Selection Chrome Tape Capabılity
Transport
Transport
Auto Shutoff Sìngle Capsŧan Transport Belt Drive (Capsŧan) Mechanical Tape Loading

Similar to Sanyo RD 4025 from the period 1976

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