Arcam phono board - problems

I can't answer your question directly, I don't use the AV8. I have an Alpha 10 integrated with phono board and it is dead quiet at any volume and not prone to picking up noise.

When it was installed at a dealer I watched them miss the pins. The guy that runs the dealership was a nice guy with a lot of pride and zero patience so I didn't have the heart to point it out. When it didn't work at home I took it apart and put the board in correctly.

The morale of the story - it is easy to miss pins and your problem sounds like a grounding issue which is making your system vunerable to noise. Check your dealers installation work and then check to make sure your cartridge ground is attached correctly to the Arcam processor.

Could also just be a bad board. Happens.

Hope this helps! Any noise is annoying.
Jim S.

Jim,

Thanks. I hope you're right and it's a grounding issue. On some lazy yet to be determined Saturday I will pull all the cords and take the unit out and open her up. It will be interesting to see what's inside anyway. I'd be bummed to find out it's a bad board; it took nearly six weeks to get this one! (delayed by Christmas holidays, then the new year, then CES). In the meantime I'm use my Rotel pre (glad I kept the RQ-970BX around).

DD,

Good hunting, and I hope it is just a pin or grounding problem.

Jim S.

Spent a whole day today trying to get rid of this. Pulled all the cords, and opened the AV8. Connectors were seated, but the wires were bunched against a side wall. Rerouted the wires, put a techflex sheath around them for mechanical protection, roughed up the sheet metal by the grounding contacts, and re-assembled the unit. Hum was reduced, but still there. Pulled the bottom off my Thorens, resoldered what wires that looked sketchy, and re-assembled. Even better, but still a hum.

Unpacked a new project speedbox, and tried it out. Hum is significantly reduced. There is still some hum though when the old walwart AC transformer is connected to the circuit, even when that transformer is not connected to anything. And if I plug/unplug my frig the hum is affected. There is no hum when I run the turntable through the Rotel pre back in to another input. It is now dead silent, even at max volume. The internal Arcam board has just a touch of hum, more like a very low level purr. Only noticeable at high volume.

The music from the Arcam board sounds good, I think it is a touch better than the Rotel. But at higher volumes there is that purr. I suspect the Arcam phono board lacks sufficient filters for the transformer hum. Bummer.

I guess you gets what you pays for.

DD,

Nice to see you post the follow up. Sorry to see the hum is still there. Does sound like the Rotel has some power line filtering that squashes the the hum that the Arcam doesn't have.

And yes, sometimes you do get what you pay for. The boards were only $100 when I got my Alpha 10. But, I don't know if I could have lived with it if it produced a hum. Heck, I had a new transformer put in an Arcam CD player because I could hear the mechanical hum when I got close to it.

Jim S.