Re: Uher CR 240 AV Cassette Recorder
I have retained the capacitors I changed - mainly on the motherboard that were not decoupling properly - as I'd like to put them through the capacitor tester when I've built it to see if they are actually duff. I'm not a fan of the bodging 'recap' and, like you, want to know what's wrong!
I used Wurth Elektronik for the electrolytics as I thought aesthetically they were suitably Germanic, and it was a shame to remove the hard-cased distinctive Elkos. But that's just me being silly about something no-one will ever see!
I did add some extra filtering to the TBA820Ps and have attenuated the headphone out a bit to reduce the noise on minimum volume.
If you've got a 50Hz hum, how are you powering it? Through AutoRadio with a PSU, or with the Z131 mains adaptor? I did replace the large capacitor in the Z131 (reservoir?), and had to do some work on the 600 Power Supply board too. Doesn't this suggest (and I'm grasping at half-understood technicalities here) a filter or decoupling failure between the power rail and the signal?
|