lewm

Responses from lewm

Grace F-9E
wrm, internal impedance of an MM is always very high.  So too is inductance, which is typically the difference between less than 50 micro-Henries (for MC) and hundreds of milli-Henries (for MM), i.e., as much as or more than 10,000X.  So I doubt t... 
Phono Stage Question.....
Sutherland, to the best of my knowledge, did not invent the idea of current drive.  As noted elsewhere, every current driven phono stage is going to sound a little different with any given cartridge.  This is my experience as an owner of a BMC MCC... 
Grace F-9E
FWIW, Soundsmith make a complete replacement stylus and cantilever assembly for the Grace Ruby cartridge, which was naught but an F9E with a sapphire or ruby cantilever. Best of all, the SS product comes with one of their line contact styli, which... 
DIY TT
Mijostyn , I am well aware of the difference in the method for speed control between the SOTA eclipse system, and the Denon Dp80, because I have both, as you may know. Of course, I do not own a Sota TT, but I have the phoenix engineering prequel t... 
SUT - electrical theory and practical experience
If the information available from Rothwell answers your questions, that's great.  Just beware of the passages where they compare the relative virtues of active high gain stages to SUTs. Because they sell transformers. Also, if Intact Audio and Rot... 
Mono Cartridge Question
"Peter" is Peter Ledermann?  
Cartridge setup experts: Azimuth critique
avanti, You have stated the cogent argument for setting azimuth so the stylus profile is symmetrically sitting in the groove and ignoring electrical parameters while also choosing only well made cartridges from mainstream companies that are likely... 
Cartridge setup experts: Azimuth critique
No grooves on the LP. The idea is a symmetrical contact with the groove, but looks ok. Don’t sweat it.  
SUT - electrical theory and practical experience
Keep in mind, Rothwell are selling transformers.  
Lyra Kleos arrives after eight months. . Worth the wait? First impressions
Sounds like they ARE fine, in fact.  
Lyra Kleos arrives after eight months. . Worth the wait? First impressions
Sounds like the EC500 uses internal SUTs for MC cartridges, judging from Dover’s quote of the specs. “40 ohms” would refer to the internal R of the cartridge for example. The 2.5 ohm inputs would probably be fine for the Kleos. But it is indeed a ... 
DIY TT
Holmz, just buy the SOTA Eclipse package complete. Does it occur to you that the question “ where do I buy a DIY platter and bearing?” Is internally an oxymoron, since DIY implies you want to make those items yourself. Raul, I have no conviction ... 
Mono Cartridge Question
I am sure one can convert a Jubilee to mono, if its internal works are like those of the London.  
Mono Cartridge Question
Ortofon mono cartridges are usually stereo cartridges where the two channels are internally bridged, but their verbiage is typically ambiguous enough to allow the reader to believe the cartridge is true mono. So “coils” (plural) is probably accura... 
Balance control?
The trim pots in the Herron might alter plate resistance on the input voltage amplifier tubes, which would affect gain. In my opinion most audiophiles would get in trouble fiddling with such a parameter. Or they may operate in some other way. Rega...