Which Mono Cartridge at around $1,300.00?


I'm in the process of upgrading my well cared for Thorens TD145. I started by soldering in WireWorld phono cable along with getting a basic tune up. I want to replace my Grado ME+ mono cartridge with a substantially better mono cartridge. Currently, the tone arm is stock. My records are classical (orchestral, chamber, vocal, etc...) dating from the 1940's and 1950's so I've been cogitating on the Ortofon SPU Mono GM MKII or a low output Grado (i.e. the sonata reference 1). My phono stage is the ASR Mini Basis Exclusive. All or any suggestions would be greatly appreciated.
Thanks!
128x128goofyfoot
Dear Goofy, What you need to find out is what is the rated gain of the phono stage via the MC inputs. What you quoted is just advertising fluff. Somewhere somehow they must also report the gain capability. However, just based on the fact that it is an ASR, I think it is quite likely that you will have adequate gain if you plug your tonearm cables into the inputs labeled "MC" or "MC phono". That is, you probably do not need a SUT. The factors that determine the need for a SUT are (i) cartridge signal voltage output, and (2) phono stage gain. Period. If you have enough of (1) and (2), you don't need a SUT.

Not all cartridges are "created equal", but the requirements for amplifying their outputs are the same regardless of brand, stylus shape, or whether they are mono vs stereo types. The only cartridge parameter that matters in this case is the voltage output for a given stylus velocity. Most manufacturers state the voltage output for a velocity of 5 cm/sec, these days. See also my post above your last one.
Thanks Lewm, I didn't mean to sound snarky, Below is the best that I could copy and paste from the phono stage manual. By the way, there are no separate inputs for MM & MC, just the way it's put together. As a side note, I've always had a basic understanding that low output cartridges tended to sound better than high output cartridges. Yes, the idea here is to see whether or not my phono stage and tonearm are a good match for a particular cartridge.

3.0 Adjusting the ASR Mini-Basis
Before you do any adjustments inside the ASR Mini-Basis please disconnect the power cord from the AC outlet.
a)  to adjust the ASR Mini-Basis, please remove the cover of the main unit. Please use a 3 mm allen wrench to loose the four screws
b)  inside the main unit you find four DIP switches to adjust the ASR Mini-Basis
c)  in input resistance can be adjusted at the 10 pole DIP switches
d)  the gain can be adjusted at the 6 pole DIP switches
d) the DIP switches have two different settings: „ON“ or „OFF“; be sure, that the switches are correctly set (when set correctly, you will hear a slight „klick“)
c) please set the DIP switches exactly the same for the right and the left channel

3.1 Adjusting the input resistance
The ASR Mini-Basis can be perfectly adjusted to bring out the best sound out of every cartridge you may ever use. Adjustment of the input resistance can be made from 47 kOhms for MM cartridges to 12 Ohms for low output MC cartridges.
We know from experience that if you are using an adjustment with a lower input resistance the ambiance is improved with limited dynamics, with a higher input resistance the overall performance is brighter and more dynamic, but definition and precision are limited.
You can easily find out the perfect setting for you: make an adjustment and listen to the system.
The adjustment you like best is the one you should choose!


3.2 U Adjusting the input capacity
The input capacity can be adjusted on DIP switch No. 10: position „Off“ = 50pF, „On“ = 150pF.
You can easily determine the value for your cartridge by using the cartridge manufacturer’s recommended value and subtract the capacity of the phono cable you are going to use –
the result is the value you have to adjust in your ASR Mini Basis.

3.3 Adjusting the gain
The gain can easily be adjusted on the 6 fold DIP switches „Gain Adjust“. The switches can be combined to get higher gain. The minimal gain of +30 dB is obtained with all Dip switches in OFF, the Maximum gain of +72 dB is obtained by putting all DIP switches to „ON“.
To know the adjusted gain please add the following values to 30 dB :
switchNo.„ON“ none 6 5 4 3 2 1 All1-6 Gain 0dB +6dB +12dB +18dB +24dB +30dB +36dB +42dB
Please set the DIP switches exactly the same for the right and the left channel (only exception from this rule: your cartridge has different output from the right and left channel).
Goofy, from Lew's information and your ASR gain adjustment quotes, it is obvious that you should not NEED a SUT. Basic phono gain for HOMC (see Lew's description) and MM/MI cartridges will be around 40 dB. Typical gain for LOMC will be around 60 dB. More sophisticated phono stages (such as yours) may offer other gain options below, between, and above those typical values.

Now the question of SUT is then a matter of choice. As Jcarr appropriately stated, choice is a personal matter and there is no absolute right or wrong. Many hobbyists prefer using a SUT for the necessary gain for their LOMC cartridges. Art Dudley, reviewer at Stereophile, is an advocate. But many others, such as Raul who posts on Audiogon based on extensive equipment experience, strongly prefers an electronic gain stage over a transformer.

So the choice is yours, no one here can say absolutely which you will prefer.
Thanks Pryso and point well taken. Of course subjectivity is limiting in the sense that I am unable to purchase 30 cartridges (excuse the hyperbole) audition them all out by comparison and then choose the one that I like best. I cannot even begin to tell you how many hours I had spent reading reviews and specifications before deciding on which amplifier and speakers to purchase. Maybe I'm guilty of trying to dodge grunt work by posting on this site but there is a wealth of information from various perspectives to be had here. In the long term, my intuition tells me to aim for one of the Lyra mono cartridges but I cannot live with this ME+ for that long. Some of the Grado wood bodied MI mono cartridges have gotten rave reviews for their price range and in this case, I would choose one of the low output cartridges (Output at 1KHz 5CM/sec. 0.5mV). But then there are other options, such as the Ortofon SPU MC mono for example. Now it seems as if my approach is to compare the advantages and disadvantages of MM, MI, MC etc... within a somewhat narrow window of affordability knowing that my plan is yet to upgrade once again at some later point in time.
The AT 33 ocassionaly shows up on J&R for $400; I use one myself. Both high gain phono stages and SUTs can work well; Bob's Devices SUT is quite reasonable and sounds very good. Which is better? I have no idea; my Basis Exclusive and Naim Superline are high gain MC only; I did try turning the Basis gain down all the way and using the SUT but this did not work well. On the other hand the SUT works well with MM phono stages. The Basis Exclusive offers up to 72 db of gain; even if the smaller Basis offers less it should work with almost any MC; Basis makes good phono stages.