Optonica RT-6505 Cassette Deck

This Optonica RT-6505 is a stereo cassette deck with Dolby B noise reduction, it was first sold by Optonica in 1978 with a list price of USD $420 and discontinued 2 years later in 1980.

The main features of the Optonica RT-6505 are: 2 heads, digital linear tape counter with 4 digits and memory stop, manual tape type selection and capable of handling normal, chrome and ferro-chrome tapes with additional manual equalization selection, belt driven single-capstan transport.

Typical front loading cassette deck 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 RT-6505 are analog needle VU reading meters with peak indicator for easy adjustment of optimum recording level. Mechanical transport controls for reliable RT-6505 transport function selection.

The Dolby-B system reduces tape hiss on tapes recorded on the RT-6505 by as much as 10 dB at the highest frequencies. The 19kHz multiplex pilot slgnal present in FM stereo broadcasts can cause false triggering of the noise reduction system. The switchable MPX filter of the RT-6505 filters out the pilot signal, and assuring proper Dolby processing of FM stereo programs.

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.

• APLD (Auto Program Locate Device)