ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello, this is my first post here.
So while taking a break from my other projects, I decided to dig this beautiful Danish tabletop out. Long story short, I purchased this radio a few years back, done some basic maintenance on it (new electrolytic caps, some new tubes, restrung the dial, replaced the selenium rectifier, cleaned the pot and the switches, replaced the infamous B&O fuse holders and refreshed the cabinet) and it performed beyond expectations. Very rich and full sound (probably thanks to the Philips bi-cone speaker), nice FM reception and Danish Mid Century Modern looks to die for. But it fell ill one day. The main symptom was that it lost a lot of power. Acceptable volume level could be reached only with the volume pot in the max position regardless of the source. FM reception was somehow worse, the magic eye tube would react very faintly to the strongest stations. I checked, I checked and re-checked... all voltages good. All tubes good (swapped every one as I have most common European tube types in my stash). Most resistors in the chain are good. Every component I measured (didn't measure everything of course) was within 10% tolerance. Finally I replaced all of the plastic capacitors as some were cracked. That didn't help.Tonight I reflowed all solder connections on the source selector and it has improved some. It seems to be playing louder on the phono/tape inputs. But FM reception is still compromised.I'm at loss. Is it possible that the solder has somehow degraded / oxidized? Should I reflow the entire PCB?What else can I try?
Best regards,
Piotr