P7 owners

[GR350]

A friend of mine has a P7 with an Exact. He has the classic Rega hum problem when the tone arm gets near the center post. He is looking for a high output MC cart that might fix this problem. Something neutral. Any ideas from someone who has tried some different ones?

[nabil]

I have never heard of this happening with a Rega cartridge-in fact the only cartridges I know if that have this problem are the Grados. I think he needs to look elsewhere for the cause of the hum-as the exact is made for the P7.

[gabriel1998]

I've had problems with hum on Grado wood cartridges but I wonder if the tonearm grounding has anything to do with it. I never really like the way its grounded. Maybe someone with an Incognito rewire can comment since you can probably float the ground.

[nabil]

Gabriel,

I've had a Rega turntable in my system for the past twenty years- a Plannar 3, a P25 and currently a P7. I've used two different Rega cartridges-an Elys and a Super Elys, an Ortofon OM 30, a Linn K-9 and K18, two different Audio Technica OC-9mlii, and my current Denon DL-S1, and I have never had a problem with hum. As I said in my last post-other than Grado cartridges I've never heard of this "classic Rega" problem. I read somewhere that the issue with Grado cartridges has nothing to do with the way Rega grounds it's tonearms but has to do with the way Grado makes its cartridges-I don't recall where I read it buts it's out there somewhere. I really don't think a rewire will solve this problem-good luck in getting this straightened out.

[watercourse]

I've luckily had no personal experience with this, but check out this thread viewtopic.php?p=358146#p358146

Maybe radiance can chime in here.

[gabriel1998]

Gabriel,

I've had a Rega turntable in my system for the past twenty years- a Plannar 3, a P25 and currently a P7. I've used two different Rega cartridges-an Elys and a Super Elys, an Ortofon OM 30, a Linn K-9 and K18, two different Audio Technica OC-9mlii, and my current Denon DL-S1, and I have never had a problem with hum. As I said in my last post-other than Grado cartridges I've never heard of this "classic Rega" problem. I read somewhere that the issue with Grado cartridges has nothing to do with the way Rega grounds it's tonearms but has to do with the way Grado makes its cartridges-I don't recall where I read it buts it's out there somewhere. I really don't think a rewire will solve this problem-good luck in getting this straightened out.

Well, Thanks but I don't have the problem, its GR350 but if I'm not mistaken I think the higher end turntables have that extra ground wire. I've never read anything negative about an Incognito rewire upgrades and most online blogs rave about it and is a must to take the lower rega tonearm to a higher level. The incognito rewire does have that extra ground wire which makes me think, it can be part of it. Having built several D.I.Y phonostages and preamps. There are many different ways to ground equipment. All of them work fine. You can use a house ground, the semi-star etc. but guess which one yields the best sonics? The Absolute ground..

[nabil]

Gabriel, I was not trying to say that a rewire wouldn't be a worthwhile upgrade, rather I was trying to explain that I've never had a problem with any of my Rega turntables and the way they are ground. My feeling is that GR350 friend's P7 has another problem. If GR350's friend wants a rewire then by all means he should get one; if he wants to fix his humming problem, I feel he probably needs to look elsewhere.

[gabriel1998]

Gabriel, I was not trying to say that a rewire wouldn't be a worthwhile upgrade, rather I was trying to explain that I've never had a problem with any of my Rega turntables and the way they are ground. My feeling is that GR350 friend's P7 has another problem. If GR350's friend wants a rewire then by all means he should get one; if he wants to fix his humming problem, I feel he probably needs to look elsewhere.

It would be nice for someone with an incognito rewire to add to this discussion. I've had many cartridges also and the only one I had trouble with was the grado but I can also see the benefit of floating the tonearm ground. Whether it works or not, i do not know. But its interesting.

[watercourse]

Well, I've Incognito'd my RB700. At the same time, I have never had problems with hum, even when I was using the Exact. Don't think I'm much help here.

[gabriel1998]

Well, I've Incognito'd my RB700. At the same time, I have never had problems with hum, even when I was using the Exact. Don't think I'm much help here.

It would be great if you had a grado cartridge to test. I have a Platinum that the cantilever broke off. Practically brand new.

[watercourse]

If you want to send it over here, I'd be happy to check it out and report back in the name of science. PM me if that works.

[radiance]

Hi, chiming in...

Yes, I have a Rega Exact in a RB700 tonearm (Stereolux cabling) and it hums, as any MM or MI (Grado) cartridge will do to a certain amount. I´m not talking of hum which is clearly audible while listening at normal volume levels but in quite passages or when moving the tonearm near the center of the platter with the volume pot turned up...This is normal behavior due to the physics involved in a MM design.

If you want to avoid the hum, buy a MC cartridge instead...

Best regards

Rad

[radiance]

Here a link to the Stereolux cabling modification:

http://www.take-on-music.de/stereolux.htm

It´s in german...

Best regards

Rad

[gabriel1998]

Hi, chiming in...

Yes, I have a Rega Exact in a RB700 tonearm (Stereolux cabling) and it hums, as any MM or MI (Grado) cartridge will do to a certain amount. I´m not talking of hum which is clearly audible while listening at normal volume levels but in quite passages or when moving the tonearm near the center of the platter with the volume pot turned up...This is normal behavior due to the physics involved in a MM design.

If you want to avoid the hum, buy a MC cartridge instead...

Best regards

Rad

Are you able to Lift your ground? I'm able to lift the ground with my Bob's device cinemag.