UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Coomber 393 Cassette Player/Recorder No Playback Sound

TonyDuell · 6th Dec 2022, 5:03 pm

The 393 has automatic recording level control, so simply attenuating the input signal probably won't do what you want.

Take a look at the sevice manual, in particular the added circuitry for the 395 (which has manual level control as well). It adds a level control potentiometer, 4 LEDs + comparators to judge the level and a switch to disable the automatic level circuit. Needless to say this is not a trivial additon but you might not need all of it (e.g. the level LEDs and drivers)

6th Dec 2022, 5:03 pm	#14
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: Coomber 393 Cassette Player/Recorder No Playback Sound The 393 has automatic recording level control, so simply attenuating the input signal probably won't do what you want. Take a look at the sevice manual, in particular the added circuitry for the 395 (which has manual level control as well). It adds a level control potentiometer, 4 LEDs + comparators to judge the level and a switch to disable the automatic level circuit. Needless to say this is not a trivial additon but you might not need all of it (e.g. the level LEDs and drivers)