Does my phono stage have sufficient gain?


I am considering a ZYX UNIverse for my Granham Phantom Mkii/VPI TNT Mk IV rig. I use the EAR MC-4 SUT with a tube phono stage run in MM mode. I would prefer the LOMC UNIverse at 0.24mV output and 4 ohm internal impedance from what I have heard and read.

Do I have enough gain? Here my reasoning:

* EAR MC-4 SUT has four taps. Using the 3 ohm tap is 30x input or 7.2mV; I have been told that each 10x of an SUT roughly equates to 20 dB, so 30x equals 60 dB??? There is a 6 ohm tap at 24x (or 48 db???)
* The MM mode of my tube phone stage provides 37 dB gain
* My line stage using XLR out is 18 dB

Am I thinking clearly?

Thanks.
128x128flyfish2002

Showing 3 responses by flyfish2002

Thanx, Dougdeacon. Ths impedance issue is a concern. Using the 3 ohm tap on the MC-4 and the stock 47.7K ohm impedance of my phono stage, the load impedance would be about 53 ohms = 47,700/(30^2) - low for the UNIverse. Might not be a good fit.

I appreciate the advice and candor. My Sonic Frontiers phono stage has been completely re-built by Bill Thalmann and the EAR MC-4 is a well-regarded SUT, or at least I thought. While I am fairly pleased with the results of this combo, I will certainly consider your thoughts. My Clearaudio Stradivari was slightly less than the UNIverse, but not by much.

The Sonic Frontiers Line 3 line stage comment did surprise me a bit. I have never had anyone suggest upgrading the Line 3 unless I had $10k plus on hand. I sent it back to Chris Johnson for a comprehensive update and mod using premium parts, so we are not talking a stock, 10 year old unit. Obviously, I like the SF sound and I thought a Line 3 was a well-regarded line stage - able to hold its own with most line stages out there. My "price of admission" to a top-tier line stage was reduced by buying a cream puff unit used and using Chris to mod.

Again, I appreciate your candor.

Brent
Thanks, Dougdeacon. I hope I didn't sound "prickly" in my response. I ALWAYS like critical input - only way to improve.

Yes, Bill Thalmann and Chris Johnson did wonderful work: completely re-wired with Teflon di-electric solid core Ag, Teflon V-caps, re-built the PS and the rectification, NOS Mullards, Mills hand wound resistors - I could go on.

Modding is very controversial. I am a fan - buy a well-regarded cream puff unit used and have the mod work done by a well-established pro. This brings the price of admission to top flight gear down quite a bit. Now, I understand that I will likely loose the mod investment IF I sell - a big if. But, even if I sell, there is no way I could have had this level of gear in my system for my budget.

Bill in particular is SOOO knowledgeable about tube equipment. I simply could not believe the sound of the phono stage after I got it back.

Chris Johnson even keeps enhancing the proprietary parts found within his Line series of line stages and Power series of amps - the last series of line stages and amps SF made prior to selling the company to Paradigm. So, for example, inside my Line 3 audio unit, the remote control and the selector button "chips" in the unit were replaced. In addition, there are three separate, independent power supplies with three separate transformers in the PS unit of the Line 3: one for left, one for right and one for the "housekeeping" functions, such as input selection, LEDs, remote control, etc. Each was seprately re-built.

The downside of my phono stage mod IMHO is the lack of flexibility - I cannot easily change impendance by simply moving a knob or a dial like the Manley Steelhead or EAR 324. My EAR MC-4 does require careful matching and the UNIverse may not be a viable candidate. My Strat is a great match and if I wanted to move to the Lyra line (which I heard is wonderful with a Phantom), the Skala and Titan appear solid, as well.

Anyway, I do appreciate the candor - good listening.

Brent