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Rega Exact |
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Fatmangolf
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Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 9695 |
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Topic: Rega ExactPosted: 10 Jul 2011 at 11:54am |
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In another thread I mentioned that my Rega P3-24 now has a Rega Exact in it again and that I was enjoying it. Compared to my Goldring G2500, the Exact's positioning of instruments and detail isn't quite as good but is fun to listen to.
Plenty of dynamics and bass. Decent stereo image and plenty of room filling sound. I think it is load dependent, which I will go into later.
I fitted it using a Baerwald arc protractor printed out from another online forum's library. This, in my opinion, is much much better than the Rega standard alignment. However you lose the rigity of the three point mount because the front hole screw ends up at the end of the headshell. No extra spacers (for the Goldring I used the 4mm spacer on Rega's multi-height ring). 1.75g VTF at the surface of a standard LP (i.e. not a 180/200g). Bias/anti-skate set with the rough scale then adjusted for a central image on the middle tracks.
Rega don't publish a lot of electrical data for their cartridges. By inference the 47k and 100pF internal loading of their phono preamp would be the right loading. Out of curiosity I measured the Rdc and estimated the self-inductance of the Elys2 and my Exact by plotting the impedance/frquency graph. The Exact isn't perfectly matched, I made the left channel 163 Ohms and 100mH compared to 166 Ohms and 90mH for the right. Anyway 100mH and 165R is near enough for what comes next.
I plugged the 100mH and 165 Ohms into a couple of simple LC resonance models and came to this practical result:
Use the Genera's standard 220pF (plus 100pF for cables) loading with and 18K combined resistance. I used a t-adaptor and 29K resistor inside a phono plug to get this result. I think it sounds much better than 100pF and 47K.
Anyway I am enjoying listening to it. Helpful tip - it does a better job on clean records.
Hope this useful information to someone else at some point!
Edited by Fatmangolf - 10 Jul 2011 at 11:57am |
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Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
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Fatmangolf
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Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 9695 |
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Posted: 11 Jul 2011 at 9:09pm |
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It is a high output cartridge at 7.2mV and I am wondering if I could reduce the gain of the Genera a bit? |
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Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
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Paperweight
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Joined: 21 Mar 2011 Location: Lexington NC US Status: Offline Points: 84 |
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Posted: 21 Dec 2011 at 1:50pm |
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I think Rega's stock cartridge alignment uses the Stevenson protractor. What specific improvements did you notice using a Baerwald protractor setup?
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Fatmangolf
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Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 9695 |
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Posted: 21 Dec 2011 at 11:14pm |
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Yes, the Rega setup's effective length is about the same as Stevenson. I think the sound improves with Baerwald (aka Lofgren A), notably clearer on the first couple of tracks. I suggest trying the Rega Baerwald protractor on Vinyl Engine.
As you will probably have guessed the third/front screw can not be fitted as you can see in my quick photo below. I think Baerwald was about 1mm less than Lofgren B shown in my picture so you would just see the very edge of the front hole.
![]() The improvement in sound from using Baerwald is worth the fiddling around in my opinion.
Please let me know if you want any more information and let us know what you think if you try this. Edited by Fatmangolf - 21 Dec 2011 at 11:33pm |
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Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
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