Hi Graham,
Before you go any further, you'll need to open a trade account. Therefore, please PM me so we can sort that out. No further posts on the forum until then. Cheers!
Marco.
Hi Graham,
Before you go any further, you'll need to open a trade account. Therefore, please PM me so we can sort that out. No further posts on the forum until then. Cheers!
Marco.
Main System
Turntable: Heavily-modified Technics SL-1210MK5G [Mike New bearing/ETP platter/Paul Hynes SR7 PSU & reg mods]. Funk Firm APM Achromat/Nagaoka GL-601 Crystal Record Weight/Isonoe feet & boots/Ortofon RS-212D/Denon DL-103GL in Denon PCL-300 headshell with Funk Firm Houdini/Kondo SL-115 pure-silver cartridge leads.
Paul Hynes MC head amp/SR5 PSU. Also modded Lentek head amp/Denon AU-310 SUT.
Other Cartridges: Nippon Columbia (NOS 1987) Denon DL-103. USA-made Shure SC35C with NOS stylus. Goldring G820 with NOS stylus. Shure M55E with NOS stylus.
CD Player: Audiocom-modified Sony X-777ES/DAS-R1 DAC.
Tape Deck: Tandberg TCD 310, fully restored and recalibrated as new, by RDE, plus upgraded with heads from the TCD-420a. Also with matching TM4 Norway microphones.
Preamps: Heavily-modified Croft Charisma-X. LDR Stereo Coffee. Power Amps: Tube Distinctions Copper Amp fitted with Tungsol KT-150s. Quad 306.
Cables & Sundries: Mark Grant HDX1 interconnects and digital coaxial cable, plus Mark Grant 6mm UP-LCOFC Van Damme speaker cable. MCRU 'Ultimate' mains leads. Lehmann clone headphone amp with vintage Koss PRO-4AAA headphones.
Tube Distinctions digital noise filter. VPI HW16.5 record cleaning machine.
Speakers: Tannoy 15MGs in Lockwood cabinets with modified crossovers. 1967 Celestion Ditton 15.
Protect your HUMAN RIGHTS and REFUSE ANY *MANDATORY* VACCINE FOR COVID-19!
Also **SAY NO** to unjust 'vaccine passports' or certificates, which are totally incompatible with a FREE society!!!
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Sent from my EVA-L09 using Tapatalk
Hi Graham,
I am only stating my personal opinion given that it was suggested that the Reference used feedback equalisation.
I'm more than happy that there are many satisfied Tron customers, more power to your elbow.
The lack of warranty is of no concern to me as I would expect something of the quality of the Tron to perform faultlessly for many many years.
I know that since Jez made that post it has become clear that the Tron does not have the RIAA EQ in the feedback loop, but it still raises the question of the relative merits of active versus passive RIAA EQ.
For what it's worth, my view is although feedback reduces distortion it can only work properly if the feedback network itself is free from distortion. If there's a distortion generating component in the feedback loop (which a capacitor can be), the feedback cannot work in the textbook manner. I wish I could do a mathematical analysis of a feedback system with distortion within the feedback loop, but I'm afraid it's a bit beyond me.
I just wish I knew what all of that meant 😂😂
Sent from my EVA-L09 using Tapatalk
Personally I don't have a problem with feedback RIAA as such. There have been many fine phono stages over the years that use feedback EQ and also many that use passive eq and I have had great results with both... or combinations of them. There are certain issues to bear in mind such as with series feedback the minimum gain is unity and so the top end does not keep rolling off with frequency indefinitely. Some units have even had an extra passive pole added after the actual RIAA eq to combat this and some have also claimed greater compliance with unofficial eq applied by Neumann lathes to records by playing with this extra pole... it is in dispute whether or not this Neumann lathes thing even exists though!
The main problem with passive eq is that it needs great headroom in the driving stage and this makes it generally an iffy proposition with solid state phono stages as they will usually have poor overload margin and may clip on clicks and ticks from the record. It's a trade off in noise against headroom ultimately and often a compromise can be found which will give good subjective results in a passive SS design, but, it will always be rather marginal on overload.... In a valve stage with likely 200V or so available this is usually not an issue.
Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)
Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco
Spot on Jez.
Yes, I agree with everything you say, but none of it addresses the issue of feedback components which produce distortion. Consider for a moment an amplifier with a flat frequency response (simply because it removes some complexity). A portion of the output is taken with a potential divider and fed back to the input. The potential divider is made up of two resistors, and the feedback reduces distortion etc. But what if the resistors are themselves non-linear? Imagine that the op-amp has zero distortion to start with but the signal which is fed back has been distorted by the two resistors. Would the op-amp still produce zero distortion?
Now consider what happens with capacitors in the feedback potential divider. Capacitors are much more likely to produce distortion than resistors are.
Maybe I'll make a more serious attempt to get to grips with the maths.
The distortion produced by good quality resistors and by the types of capacitor dielectric used in eq stages would be so small as to be immeasurable though... also this would apply to every feed back amp and not only phono stages... then what of this distortion from all other resistors and capacitors in the signal path?
Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)
Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco