Myisland

By chance I acquired an Amdek Color-I monitor and connected it to the Atari 800 using my old homemade cable. Both video and sound works but there is too much hum. How do I fix the hum?

Atari 800 Update: I found my old homemade monitor cable and connected it to TV using the RCA video and audio connectors. I got clear sound but no video. I'll need to find the pin-outs chart somewhere.

I should still have a homemade composite cable from when I owned an Amdek monitor. I'll have to find the pin-outs chart.

So far comments indicate a bad RF modulator or bad a POKEY. How do I test which it is? I'm an electronics novice or but can follow instructions. I do repair my own cars, house, appliances, and have built PCs since early days. Today I'm snaking out the kitchen drain pipe.

I vaguely remember now having a Sony 15" color TV which had one of those back in the 1970's.

Not sure what you mean by "fine tuning". Picture is clear but zero sound. I hooked up the 810 disk drive, ran a head cleaner disk, then ran a game floppy and it loaded and ran fine but no sound.

I'm in Los Angeles. Tested using 13" Magnavox CRTMWC13D5 and also a Sony 32" XBR KV32FV26 year 2000

Does anyone have an idea about getting the sound to work? I've also tested it on a second TV with the same result. Maybe the sound chip died while waiting on me? I bought this in 1982 for $800 and used it in college to program BASIC. I'd feel bad about trashing it after all of these years. Also have an 810, 850, and an IndusGT I found my 520ST is in another box too. Long ago I gave my 800XL,130XE and a 2600 to my nephews.

Upon discovering your forum I unboxed my Atari 800 after 20 years. I connected it to the 13" CRT TV's antenna plug using the Atari's built-in RF cable and a Computer/TV switch box CA010112 The video looks fine but there is no sound.