Dolby 361 Processor + Cat.22 card (B Stock) #9

£150.00

In stock

*

Description

These Dolby 361s date back to the 1970s & 80s and may have missing bulbs. They are fitted with a standard Dolby A Cat.22 card

They are untested and sold as seen. Cat.22 card included. No power cable supplied

There is a setup guide for using Dolby hardware here


The Dolby 361 was ubiquitous throughout the 1970s, 80s and 90s. It was the standard single-channel Dolby mother unit, compatible with the original 1965 Cat 22 Dolby A card and the later Cat 280 Dolby SR cards. Every studio had a couple of 361s but they are now surprisingly rare on the secondhand market

As a double-ended noise reduction system, Dolby A encoded the signal and applied reciprocal decoding on playback. If the tape machine was aligned correctly the system was pretty transparent and gave a significant noise reduction, particularly at higher frequencies

Post-digital, Dolbys are obsolete except for archiving and for doing the Dolby Trick. Dolby A splits the audio spectrum into four bands, applying varying amounts of compression to each. Compression is level-dependent so, as levels rise, compression backs off. At higher frequencies, where tape hiss is more obvious and average signal levels are relatively low, a fair amount of compression could be used, resulting in a dramatic perceived reduction in tape noise & hiss

These Dolby 361s date back to the 1970s & 80s and may have missing bulbs. They are fitted with a standard Dolby A Cat.22 card

They are untested and sold as seen. Cat.22 card included

The 361 was patched into tape machine feeds & returns and switched from record to replay mode as required. There's a remote socket on the back panel for automatic record / repro switching but most 361s were switched manually

Built like a brick outhouse, the 361 is a 1U device weighing in at 5.5 Kg. There are no electronics in the 361 but inputs & outputs are transformer-coupled. It contains a power supply, dedicated input / output switching section and a slot for the noise reduction card

Many 361s came with a non-standard power connector for which a suitable power cable will be supplied. Later models used a standard IEC socket in which case a UK, USA or Euro Schuko power cable will be supplied on request. Voltage is switchable 110 / 220 VAC

Standard 1U device suitable for rack-mounting. The 361 is heavy (5.5 Kg) so should be mounted with care

1U

In good condition for a vintage piece of kit. These Dolby 361s date back to the 1970s & 80s and may have missing bulbs, defective meters, etc, and spares are NLA. None of these affect operation - switching is mechanical and there is no electronics in a 361 apart from transformers

Cat.22 card included. No power cable supplied

Untested, sold as seen. Photos show the Dolby for sale