BeoGram 1000 to Marshall Stanmore

Reply

sifla Posted: Sat, Dec 29 2018 6:12 PM

rated by 0 users

Hello

I'm the happy owner of a restored BeoGram 1000 that has served me well over multiple years. I recently purchased a Marshall Stanmore Bluetooth speaker and I hoped I could connect these.

The Marshall speaker has both RCA and AUX input.

After some research I purchased a RIAA phono preamplifier and a DIN to RCA cable. 

When I connect these parts theres a basic loud buzzing sound and when the music starts playing the sound is just all off.

Any ideas to what I've done wrong?

Hope you can help me out, thanks :)

Reply

Dillen replied on Sat, Dec 29 2018 6:23 PM

rated by 0 users

I am not familiar with your Bluetooth device and your preamplifier, but it sounds like a grounding problem.
Most Beogram 1000s have a capacitor (usually a mustard colored Mullard/Philips) between signal ground and chassis ground inside the
deck at the socket for the optional (HEY!) plug-in RIAA module.
Not all preamplifiers will handle both ground signals, so you could try to short the capacitor inside the Beogram (this won't damage anything) and
see, if that makes the buzzing go away.

Martin

Reply

sifla replied on Sun, Dec 30 2018 5:21 PM

rated by 0 users

Hello Martin

Thank you for the reply. I think you are right about it being a grounding issue. I thought the same cause of the loud buzzing/humming sound. But besides that the music sunds very distortet and just wrong. Can that also be a grounding problem?

In regards to your solution I don't trust my technical skills to solve it, but I'll try taking it to the store that restored the turntable and see of they will give it a shot. 

Simon