Resolution: 2 half wave voltage doubler rectifiers, with uF pass,uF buffer caps and 4x1n diodes, and single uF between rails. Ripples under 0. Big improvement in place, still dull sound for me. What else can be wrong? What else? Wait, they put ohm stoppers!?!? Usually not a problem, but not what i expect for source impedance. Quick swap with ohms and Tha-Daaa. This little boy start to produce what it should at first place! Great, now new muting transistors.
But, there is something wrong to my eyes. Regular NPNs, but with emitters to signal. It is imperatively Denon decision to use such configuration in almost every system they ever made, seen very rare on other brands too. There are tons of reasons why not to use this configuration, from pure safety to killing actual signal quality! Now this player plays very close to my main Yamaha RX-A to its 32bit sabre dacs connected to external CD transport. For tests Denon is connected to analog input and transport is connected to coax spdif of this big boy, so same post processing, same power amp, same speakers.
No ambitions to make them equal, actual achievement is more than i expected. Material investments was minimal, entirely from my junk box. The lesson: Pay attention to small and unexpected things. They may made really big difference. Now i will get back to the receiver to see what can be done with it.
Hope my story may help to someone else, as some or all of those errors are found in so many players, even in so called high end ones. Usual internet advises are in completely different ways, difficult to implement and with suspected outcomes. EDIT: New power supply was added only for opamp. Everything else remains powered as before. Last edited: pm. More options.
Mooly Administrator Paid Member. Click to expand Just different view point, not arguing in any way. What about capacitance at emitter and collector? Capacitance means reactance. I can hear you are arguing: they are in pF range. Yes, they are, this does not prevent distortion. What about leakage currents at emitter and collector?
Again big difference. Everyday duty of muting transistors is in non-conducting state. In isolation every side can be represented as steady GND and other one as moving across it signal. Just different parameters make the big difference. Perfect world replacement is simple relay. Your suspicious are correct. What about distorting muting transistors put between input selector chip for example and power amp? It is not only for damaged ones, also perfectly working transistors can distort if used inappropriately.
That are my understandings and i can be completely wrong in them. You are right. I have replaced many muting transistors for micro relays BUT for some duties relays may be too slow. Reversed bi-polar transistors are often used where the extremely low V sat can be exploited. Googling reverse V sat returns loads of links, but this quote sums it up: "Invert the transistor and Vcesat reduces to about a tenth of its non-inverted value.
An old time trick used before FETs became available. OP is right as capacitance is voltage dependent. It is an old trick but also a bad and cheap old trick to use bipolar transistors for muting. I removed bipolar muting transistors for years when possible. In many devices analog output stages this is clearly a positive difference but it is not always possible for instance in digital sources when an uncorrectable error occurs.
The test is simple and it can be quite convincing. It depends on type of transistors, values of series resistors and if they are used with C or E connected to the signal path. The later introduced special muting transistors were slightly better than the regular ones but for some reason they often failed. This amplifier I also have one was designed in an era when decent switching jfets were difficult to source for the price of an excellent bipolar like the workhorse 2NA.
ALL bipolars can be used in reverse mode, but the hfe is usually much less than one and the 6V Bvebo is also limiting so there is normally no advantage. A special case is to exploit Vec sat ie reversed having a much lower value than the Vce sat.
Effectively this means that the ON resistance is low ohms and can make an excellent attenuator with say a 20k source impedance. Back in the day I am ancient I worked for Fairchild and we used reversed EC transistors as choppers in instrumentation amplifiers with great success. I am hardly promoting this for new designs there are many superb J and D FETS with very low on resistance but hoped to explain why this was used.
I have never experienced blow-ups, but maybe I am more cautious with age. He he, I am a bit ancient too. My everyday job is not related to this kind of electronics. And again, that is how I see the situation. I don't pretend to be correct. I can happy accept few more milli volts at output during ON phase, but can't accept any signal degradation, especially if i can fix it for free.
Switching speed is also not important here. May be slower switching is better, not sure? FETs can add additional capacitance i will have to deal with later. For relay i have to look for suitable power line and where to fix it. I shared my way of cheap fix of this unit mainly manufacturer errors. It is not new design. Anyone else come across surprises like this from something that, generally speaking, an audiophile would turn their nose up to?
Looks like a nice little set. Rosewind , Nov 6, JemHayward , Nov 6, My system is largely comprised of components that "generally speaking an audiophile would turn their nose up to". Modern marantz amplification, an unmodified complete with stock tonearm, bearing, platter and mat with justifiable reasons for keeping them all and a selection of studio grade cables that are as good as anything else out there without the fancy branding, marketing BS and associated price tags.
All powered by a couple of 4-way power strips that were less than a tenner each, though the amp does go straight into the wall. Sounds better than many heavily tweaked systems I've heard costing far more. I've had a few pleasant surprises over the years. A Bush CD player I forget the model, though there was an amp and DAB tuner in the range too was extremely musical and had an extremely sturdy transport mechanism and was in general very well made.
Great phono stage too. Ok, not quite up there with the more esoteric brands, but, easily good enough for most people. Sadly both brands tend to be better recognised for their budget offerings, simply because as you move up to the higher end products the British and US products are the ones being pushed by the magazines. Having owned products from the more esoteric brands, I believe that the higher end Japanese products offer the same performance for less money, not to mention useful features and in many cases better build quality.
JezmondTutu , Nov 6, DevillEars , Nov 6, You must log in or sign up to reply here. Show Ignored Content.
CTM CT Aurian Jungle Custom. Aurian Skyline Custom. Aurian Ocean Custom. Reshell Shure SE JH Audio Lola Custom. JH Audio Layla Custom. Aurian Storm Custom. UE 11 pro Custom. JH Audio 11pro Custom. Aurian Sunset Custom. JH Audio Roxanne Custom. Sony WF-XB Ultimate Ears UE 5. Aurian Hybrid. Reshell Onkyo M. Reshell Westone W JH Audio Jolene Custom. JH Audio Jimi Custom. JH Audio Roxanne. Reshell CTM.
Reshell JH Audio 16V2. Reshell Westone. FullShell KZ. FullShell Whizzer HE Reshell Fiio EA3. Reshell RHA T Reshell Dr. Head 3. Reshell Fiio. JH Audio 10X3 Custom. JH Audio Angie Custom. Die mitgelieferte Batterie ist angeschlossen wird, werden die Fernbedienungssignale auf den Fernbedienungssensor gerichtet wird. Page Caracteristiques 3. Page Depannage SA. Page Caratteristiche 2. Selezionate il brano da ripetere.
Seleccione la pista que desea que se repita. Page Funciones De Sistema Mando a distancia primera pista programada. Page Kenmerken 1. Tijdens de versterker. Selecteer het stuk dat u wilt herhalen. Voor instructies over aansluitingen verwijzen wij u naar de respectievelijke track die bij het direct zoeken is gevonden. Schakel de voorhoofdversterker in.
Print page 1 Print document 96 pages. Rename the bookmark. Delete bookmark? Cancel Delete. Delete from my manuals?
Hello guys. This story is for yet another highly overpriced old cd player, part of component system with beautiful look. Used Denon DCDSA SACD players for sale on + second hand hifi sites & shops. Use Hifi Shark to monitor pricing and global availability. View and Download Denon DCDSA operating instructions manual online. STEREO CD PLAYER. DCDSA cd player pdf manual download.