02-20-2021, 07:38 PM
Hi all,
I've worked on a lot of radios over the years, mostly AA5 & 6, '40's table radios. I'm just a hobbyist, not an engineer, so I struggle with theory at times. Every once in a while I'll have a radio receiving and playing beautiful except for a very low hum. You don't have to add much volume to drown it out, but at very low volume it's there and makes use of the radio not what it should be. So I go about looking for a cause and I get nowhere. This is after re-capping, checking resistors, re-routing grid wires, checking tubes, etc. My question is, am I expecting too much? Should I expect a humless sound at whisper volume or am I driving myself nuts trying to make an 80 year old radio sound like something it's not. Maybe I need to relax and just turn up the volume?
I've worked on a lot of radios over the years, mostly AA5 & 6, '40's table radios. I'm just a hobbyist, not an engineer, so I struggle with theory at times. Every once in a while I'll have a radio receiving and playing beautiful except for a very low hum. You don't have to add much volume to drown it out, but at very low volume it's there and makes use of the radio not what it should be. So I go about looking for a cause and I get nowhere. This is after re-capping, checking resistors, re-routing grid wires, checking tubes, etc. My question is, am I expecting too much? Should I expect a humless sound at whisper volume or am I driving myself nuts trying to make an 80 year old radio sound like something it's not. Maybe I need to relax and just turn up the volume?
