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
Hi everyone. So I have a Beogram 1602 and a RX2, and I love them both a lot. However, both seem to have the same issue, and I'm curious if this is really an issue, or if it's normal operation.
I know that these turntables have a mute function so that you can clean the stylus and not have to mute your system volume, and that works perfectly fine. However, when I go to play a record, once that mute switch turns off, I get a loud popping noise. This also happens at the end of a record when the stylus is lifted off the record, and the mute switch is once again activated.
I'm wondering if anyone else has experienced this? I replaced the capacitors on the control board and sadly this didn't help. I'd really appreciate some help here.
I'll try to make a video showing the situation. Also, the RX2's speed is way too fast. Any idea how to get it back down to proper 33 1/3?
*edit* got a strobe, found the motor controls, speed issue fixed. Still have the mute switch pop noise though.
Here's a link to the video I made. Here
After posting on a few other forums, I found an answer to my issue. Turns out my pre amp is leaking current back into the turntable.
Phil: Hi Beitie,I think that your phono stage is implicated in this. Either by design the input biasing current is excessive or it may have input coupling capacitors which have gone leakey. DC current is flowing back from your phono stage to the Turntable. When the muting switch is exercised the Source resistance of your Turntable takes a step producing the glitch which you are hearing. Connect a DMM across each of your phono inputs in turn using the microamp range. Consider anything more than 5 microamps excessive.Phil
Hi Beitie,I think that your phono stage is implicated in this. Either by design the input biasing current is excessive or it may have input coupling capacitors which have gone leakey. DC current is flowing back from your phono stage to the Turntable. When the muting switch is exercised the Source resistance of your Turntable takes a step producing the glitch which you are hearing. Connect a DMM across each of your phono inputs in turn using the microamp range. Consider anything more than 5 microamps excessive.Phil
He was correct, and to verify, I hooked both tables up to an old Pioneer receiver with a built in pre amp. Neither table reproduced the "pop" noise.
Any DC introduced backwards from the signal path to the coils of the cartridge is bad. - Very bad!
Martin