New Posts New Posts RSS Feed - Understanding Record Repro
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Join our friendly forum here and subscribe to our newsletters here

A rule of fairness:
When other manufacturers websites allow people to recommend our products instead of their own then people can do the same here, but please not before! Such posts will be deleted.
See terms and conditions here...

Understanding Record Repro

 Post Reply Post Reply Page  <1 101112
Fatmangolf View Drop Down
Admin Group
Admin Group

Joined: 23 Dec 2009
Location: Middlesbrough
Status: Offline
Points: 4541
Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2017 at 10:40pm
This is a great thread. The web is full of myths and repeated opinions, this is where we hear from experts testing and explaining what they hear!


Open mind and ears, whilst owning GSP Genera, Accession, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
Back to Top
BAK View Drop Down
Senior Member
Senior Member

Joined: 14 Mar 2010
Location: Kentucky, USA
Status: Online
Points: 695
Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2017 at 4:04am
Originally posted by Graham Slee Graham Slee wrote:

Back to my pet subject: heterodyning; it is also known as sum and difference. Two frequencies mix to produce their sum, and their difference. The sum is higher in frequency; the difference is lower in frequency.

I was recently made aware of this video of Peter Ledermann...

And at 19 minutes in, he talks about sum and difference regarding moving coil. The resonant frequencies of the cantilever which he discusses seem to correlate, and so it is possible that the sum and difference frequencies he talks about do exist.

Since making a buffer or isolation stage which reduces the effect of the high frequency interference discussed in the early part of this topic, the audible effects of those are vastly attenuated.

It works because the transistor used is a power transistor, which having a much smaller base spreading resistance is lower in noise than small signal transistors, but being a power transistor it hasn't the same high frequency gain. Added to this are input resistor/capacitor filters which do not load the cartridge, but simply attenuate the high frequency interference.

Still, after many weeks burn-in there is brightness, and I can only put this down to the resonance of which Peter Ledermann speaks. Otherwise the sound is far more musical, and I suppose, for those used to hearing moving coil, will sound just right. I am getting used to this more musical brightness, which without the interference heterodyning isn't anywhere so harsh as it was.

 I thought this needs a refresh on the forum. Others may have missed the video and Graham's important comments above.
AT-14SA, Pickering XV-15/625, Technics SL-1600MK2, Reflex M, Lautus, Technics SH-8066, Dynaco ST120a, Eminence Beta 8A in custom cabs;; Using Majestic DAC
Enjoy Life Your Way!
Back to Top
 Post Reply Post Reply Page  <1 101112
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.047 seconds.