Help: New Rega P3 & Grado Platinum; No highs

Hi, Eastsideguy: I'm a fellow Seattle resident, so you are welcome to contact me and we can talk about your problem. So you know, my analog front end includes a Rega RB900 arm with a Grado Reference cartridge, so I have some familiarity with your setup.

You may have a combination of factors that are causing the symptom you describe. Here are some general comments to think about before we talk:

1. As others noted, the vertical tracking angle is important, but only a seriously out-of-whack setup would account for the severe symptoms you describe. The Rega arm can be raised using spacing washers, and I have a set that you are welcome to try (I don't use them).
2. The procedures you used to set the tracking force and anti-skate aren't the best methods for the Rega arm. The best results will be achieved if you set the Rega's tracking force gauge to the maximum (3 grams, I think). This may seem counter-intuitive, but the maximum setting actually disengages the tracking force spring. Then, set the tracking force using a decent gauge, such as the Shure balance-beam gauge which you can buy for $20 (or you can borrow mine). To set the anti-skate, I usually use a vinyl LP that has a special grooveless section. To adjust the anti-skate, you place the tonearm down on the record, and watch to see if the tonearm skates inward (toward the center) or outward (toward the edge). You simply adjust the anti-skate force until the tonearm remains stationary while the LP is rotating. You are welcome to borrow a test LP from me that has one of these grooveless sections. I must tell you, however, that having a bit too much or too little tracking force and anti-skate would not account for the severe lack of highs that you describe.
3. The tonearm wiring in the Rega arm that comes with the P3 isn't the best, nor is the counterweight. You might want to consider the "mod" available from Expressimo Audio, which includes upgraded tonearm wiring and their "HeavyWeight" counterweight. I recently bought the "HeavyWeight" counterweight, and found that it made a very significant improvement on my RB900 arm. I'll give you more detailed comments about these mods if we talk.
4. The problem you describe -- specifically, the lack of highs and air -- sounds to me as though there is a cartridge impedance mismatch. You did not state what cartridge impedance setting your preamp has, so I suspect that may be the main problem area. The Grado cartridge is a moving iron design, and they usually work better when they have an impedance similar to a moving magnet design. I suggest you check the cartridge termination in your preamp to be sure it is compatible with the Grado.

If you'd like to talk by phone, drop me an E-mail with your phone number and I'll be glad to call you tonight after work, or this weekend.

Best regards,

Scott C-

Yes, the Classe must be set to mm operation via internal jumpers. Dull sound results from gain mismatch using mc setting with an mm cartridge.
For a brief time I had almost the exact same setup as you do, and it sounded absolutely marvelous.
Grado and Rega actually do synergistically work, I do not know the basis for Marakanetz' observation here. The only problem with the setup is some hum from the high output cartridge when the cart. moves closer to the motor on the P3 (as it gets closer to the center) - unless you have the low gain version of the Grado, in which case my first point is nullified.
VTA adjustment is not necessary, the Grado's height actually gives the arm a nice slightly tilted back orientation that gives good sound.
Break in as also a factor but check the phono gain first!
All the best
Tom

I think that Tacs has his finger on the problem. After I read your second post, Eastside, I saw that the cartridge setting in your preamp is for moving coil, which is not what you want to use with your Grado cartridge. Set the preamp for moving magnet inputs, and if you can adjust the impedance settings, I'd try the 47k ohm setting (usually the standard setting for moving magnet cartridges). If your preamp has various alternative settings, you might do a little experimenting to see which ones sound best, but the 47k ohm is the place to start. You may also be able to adjust the gain settings -- if so, a gain of 40 db is sufficient for higher-output Grados (such as my Reference, which has an output of 4.5 mV), while a gain of about 60 db (the gain for many moving coils) may be best for Grados with a 1.5 mV output.

Scott,you the man! The Regas and Grados are a very good match.VTA should be fine with no spacer(s) Set the phono pre to 47K,let the Grado play for 30 or so hours and enjoy sweet analog music! Please let us know how sweet it is!!

Wow, you guys are great!! I have many leads now.
I set the preamp to MC via an internal jumper because
it seemed like MM didn't have enough volume. I only
tried it for about 10 seconds and felt like the
preamp distorted when it got to 1 o'clock and still
wasn't loud enough. That's why I switched to MC.

I'll see if the MM sounds right if not too soft. If
this fixes it then I just need a highier output Grado.
I went out of my way to get the VPI 1.5mv version
because people said it did better with the hum problem. Well I still hear the hum but its not that bad so long
as the music is playing to drawn it out.

Does the P25 have the hum problem too? I'm thinking
mabye I should have gone that route.

Tom