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  »  New  Where are our good phonostages?..  Omnigon Tubes...  Analog Playback Forum     61  638399  05-31-2004
  »  New  The Expressive Technologies SU-1..  “too bright” or “resolution” or “details” with SUT prim...  Analog Playback Forum     33  361519  12-30-2004
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  »  New  Phono stages with SU-1..  SU-1...  Analog Playback Forum     4  63748  11-23-2007
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  »  New  Buying a last cartridge...  Lucky you...  Analog Playback Forum     80  779373  09-05-2008
  »  New  EAR 834P mods..  The cap will not change volume in the pass band...  Analog Playback Forum     45  615938  11-04-2008
  »  New  AMR PH-77: just another phonostage or more?..  Oh, yeah... the sound of the Thing Itself......  Analog Playback Forum     11  126919  07-05-2009
  »  New  An interesting Russian pnonocorrector...  Uber-tweeky phono topologies deconstructed...  Analog Playback Forum     9  95070  03-01-2010
  »  New  Expressive Technologies SU-1 and cartridge output and i..  MV and Ohms...  Analog Playback Forum     2  31923  07-07-2011
  »  New  How to run MM-type cartridge into MC phonostage?..  Quite interesting....  Analog Playback Forum     6  64077  11-13-2011
  »  New  The tales of two phonostages: Allnic and 834PT...  The tales of two phonostages: Allnic and 834PT....  Analog Playback Forum     0  22388  12-21-2011
09-14-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 61
Post ID: 8255
Reply to: 5856
The “End of Life" Phonostage Status….

With my resent battle with Shelter and the off the FM session analog renaissance I am playing a lot of records and there is one observation I would like to make. I feed all my 3 “better” tonearms into the “End of Life" Phonostage and I can’t not to mention how beautifully the Phonostage behave and sounds, in fact it is beyond beautiful, it is truly extraordinary.

I usually is very bitchy about the performance of audio elements, would it mine or others. I know well where my own audio element slips. However, with the “End of Life" Phonostage I have literally no single point where I would have an issues. It just does phenomenal Sound and it turned out to be phenomenally friendly and accommodating in my setup. As far as I concern the “End of Life" Phonostage is truly deserves it’s name…

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-14-2008 Post does not mapped to Knowledge Tree
drdna
San Francisco, California
Posts 526
Joined on 10-29-2005

Post #: 62
Post ID: 8256
Reply to: 8255
Specific air cap changes
Romy,

What specific objectives did the air caps address in the circuit? You refer to the tempted virtue sound but I am unsure as to the goals that you were trying to achieve with this circuit alteration?
09-14-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 63
Post ID: 8259
Reply to: 8256
The air capacitors 'allegations'.

 drdna wrote:
What specific objectives did the air caps address in the circuit? You refer to the tempted virtue sound but I am unsure as to the goals that you were trying to achieve with this circuit alteration?
Adrian,

 I what wrote about the air caps in the thread: “Where are our good phonostages?”

The genuineness of this Paravicini circuit is that he use feedback to plate – or to vey high impedance – and in this situation it revilers very small values of capacitance to write the necessary RIAA curve. In fact the curve is written not by the feedback but by the Miller capacitance of the tube. The 12AX7 was designer as audio tube, it is a radio-frequency rube  and therefore is has very high Miller capacitance, the capacitance the otherwise conceded as parasitic but the smart Paravicini put it actually in the beneficial use. So we have a circuit with “hidden RIAA”.

Now Paravicini adds the very light touch of capacitance into feedback to make the Miller capacitance to work what it shell work. The values are very small s the capacitance in feedback sort of multiply the tube’s own Miller capacitance. The series capacitors in feedback, regardless of value and types are very bad. In fact a feedback cap is the more auditable them loading, coupling, cathode or any other cap. The coupling cap for instance is charged with DC on both sides and the AC. What cap is? It is the sequence of conductive and non- conductive surfaces where non- conductive dielectric acts as an abrupt termination of AC flow. However, the dielectric is not a perfect dielectric and has some free electrons in itself that can care the signal.  This abrupt termination induces a microscopic force in the dielectric that make the dielectric to move, and by virtue of it creating variable reflections of transmission termination. So, that coupling cap has already charged or pollarded with DC on both sides and the cap’s conductors have already biased or physically oppressed the cap’s dielectrics. In case of cap sitting in feedback there is no DC (in second cap) and the dielectrics are not damped. Furthermore the re-polarization of dielectrics does not happen at non-auditable frequency but at very much auditable frequency – the frequency of the correction. I do not even mention that dielectrics experience different behavior of  electro- mechanic induction at different frequencies…

 So, how to create a better condition on this situation? The concussion is to get rid of dielectric all together. The non-dielectric caps: air or vacuum are very large for a given value but in this Paravicini case the values of the caps are so small (100pf and 300pf) that the air caps could be called for the duty.

I do not say the in the “End of Life Phonostage” the air caps is something that made all sound. The ET SU-2 transformer I think is the very heart of this Phonostage and 80% response for the corrector’s sound. Still, I think the air caps were very contributive as well. I did not listen the “End of Life Phonostage” with mica caps but I did listen and did “evaluate” the vintage mica, the polystyrene and air caps in context of my 7788-7721 phonostage.  (It uses the absolutely the same Paravicini’s ides of feedback only uses7788 pentode in input and has just two stages). The result was very superbly convincing and perfectly proved the theory about the fundamental advantages of air caps.

The caT


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-14-2008 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,570
Joined on 10-12-2006

Post #: 64
Post ID: 8260
Reply to: 8259
One tube, two channels?
Romy, doesn't Tim de P also use this cool Miller capacitance idea in his never-mentioned "high end" tubed corrector?  Also,  do I remember reading that he runs both channels through the two halves of the same twin-triode 9-pin tube?  Is this something you changed when adapting two units for stereo?  BTW, I have never heard the P88, or whatever he calls it.

Best regards,
Paul S
09-14-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 65
Post ID: 8267
Reply to: 8260
The halves of the twin-triodes

 Paul S wrote:
Romy, doesn't Tim de P also use this cool Miller capacitance idea in his never-mentioned "high end" tubed corrector?  Also,  do I remember reading that he runs both channels through the two halves of the same twin-triode 9-pin tube?  Is this something you changed when adapting two units for stereo?  BTW, I have never heard the P88, or whatever he calls it.

Well, it was a long debate in the past if to keep my “End of Life Phonostage” as it use to be: six tubes, having 3 halves running right and left channels and keeping other halves half “cold”. I eventually decided to go for just 3 tubes running right and left on the opposite halves of the same twin-triode. I very careful considered the cons and pros and consulted with many people. I still do not know if my decision was “correct” but below is my rational. Subjectively I think that I did detect some very negligibly minor advantage of six tubes version but it was so none-conclusive and so non indicative that I discarded it as a margin of the experiment.

For using halves of the same twin-triode:

·  Less costly tubes.
·  Less inner chassis hit.
·  Less filament AC inside the phonostage chassis
·  More compact and elegant layout
·  Inability to reuse the tubes buy flipping them to another side when the current cathode is gone
·  The tubes of the right and left channels come from the “same barrel” (gas contamination, cathode poisoning etc)

Against using halves of the same twin-triode:

·   Alleged crosstalk

I truly do not know any other considerations then crosstalk and here how I thought:

According to the papers the crosstalk in the twin-triode is around 90dB-100dB. It is VERY high number; do not forget that cartridges have 20dB-30dB. The numbers of crosstalk are mystery for me and I was not able to see how extra 10-20dB of improved crosstalk do better for imaging subjectively. I figured that 90dB-100dB if electrical separation in twin-triode is too high do not worry about it. The 100dB of separation even my Macondo can’t handle as my horn pick the pressure from room and have their diaphragms to act as microphones. I have my amps off and might talk at my room in normal voice, having the channel loudness-to-pick- modulation meters on Macondo running a full scale…

So, I think and feel  that in practical application the theoretical crosstalk in twin-triode is way offset by the advantage I enumerated above.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-15-2008 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,570
Joined on 10-12-2006

Post #: 66
Post ID: 8279
Reply to: 8267
"Crosstalk"
As it happens, the K&K uses a similar-but-different version of this, with the gain halves divided to sandwich the Loesch-style network.

If I am not mistaken, a couple of the "classic" microphones also "split" twin triodes for stereo.  In any case, I have not noticed any crosstalk, at all.  To the contrary, I have to reposition my speakers to get center fill on even marginally hard-panned recordings.

At this point, it certainly appears that simplicity/shorter traces, etc. trump "greater separation", and T d P and KC know what they are doing, despite "conventional wisdom".

Best regards,
Paul S
10-26-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 67
Post ID: 8630
Reply to: 5856
I just love sound of this phonocorrector.
fiogf49gjkf0d
I needed to make a very minor grounding correction in my “End of Life" Phonostage that make me to take it off the system and open it up. I realized that I never made a picture of it when it was done. As I said before - after 6 month of service I am hugely in love with the sound of this thing. I am kind of so accustomed that all my audio have a “second layer”, the layer where I am not completely satisfied that “End of Life Phonostage” turned out to be a very pleasant exception. It was vertically painless; it had no “mysteries” with bad sound, it had no unpredictable things that needed to be researched and evaluated. The sound of the corrector just perfect and even the ergonomic of the thing is perfect. The only thing that I feel it a “weak” is that the “End of Life Phonostage” can’t be shacked as it has air caps that might run away with value under a violent tremble. I do not see it possible as my Phonostage is sitting in my 1.5 ton rock. Anyhow, here is the picture of the thing, and I love it with ANY cartridge. That IS the End of Life Phonostage.

End_of_Life_Phonostage.jpg


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
11-16-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 68
Post ID: 8871
Reply to: 8630
To close the book on the correctors subject ...
fiogf49gjkf0d

To close the book on the correctors subject I put some comments in a dedicated page in “My playback” section.

http://www.goodsoundclub.com/EndOfLifePhonostage.aspx

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
01-16-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 69
Post ID: 12711
Reply to: 5856
"End of Life Phonostage" in Thai
fiogf49gjkf0d

Here is a Thai guy looks like built my “End of Life Phonostage”

http://www.kaponk.com/node/715

I do not see nether input choke or air capacitors in correction chain. The most important I have no idea what step-up transformer he used and what kind sound he is after. I am sure he can read schematic and to solder but it not so important skills. I do not read Thai but from I understood he did not talk about sound of this thing in his article.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
03-29-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 70
Post ID: 13237
Reply to: 5856
Sucks!
fiogf49gjkf0d

It is always there is something that poisons everything. It is last night in my Boston apartment, a night before the final big move and I was in the middle if heavy packing. Suddenly as lighting stroke me: I was moving my moved audio equipment from one bedroom to another bedroom, letting the carper guy to do his job, as suddenly I realized that I did not move my End of Life Phonostage. All my equipment was sitting in one bedroom and all of it has one way or another some kind of handles. The End of Life Phonostage has no handles of any kind and I do remember that whatever I moved I used handles. I dropped everything and rushed to my new place and for sure I did not see my phonostage.  I do distinctly remember that I move it, right on the seat of my car, driving very gently in order do not fuck up the air capacitors, and now it look like it gone. If it so then it is VERY sad!!!

I heard that during the move the things walk. Over the last 2 week I have contractors working in my new place. I do feel very confident and comfortable about them, still where the hell my phonostage? I am sure no one need it beside me, particularly without power supply, still the bedroom is the only room where all equipment sits and the phonostage is not there.  If it were lost then phonostage itself is not a big deal but it had the Expressive Technologies SU2 transformer in it and this is non-replaceable. This feeling of lost phonostage really poisons my entire getting new house ceremony and I am very upset…

Is it God punished me for the overly ambitions name of the phonostage – “The End of Life Phonostage” or is it some kind of sarcastic message of him for my arrogant treatment of the phonostage as the last statement of pnonocorrector?  I do not know.  I was driving back to Boston to continue packing and was thinking that I would need a new phonostage – I so do not want to deal with phonostages anymore…

Anyhow, I got home and I am not in the mood the pack. A few thousands LPs left to be packed but I have no feel to touch the vinyl.  Fuck it, I will ask the movers to pack it tomorrow, I am in the moaning for my “The End of Life Phonostage”…

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
03-30-2010 Post does not mapped to Knowledge Tree
oxric
Posts 194
Joined on 02-11-2010

Post #: 71
Post ID: 13238
Reply to: 13237
Is God's phonostage better than Romy's? It is now!
fiogf49gjkf0d
 Romy the Cat wrote:

...This feeling of lost phonostage really poisons my entire getting new house ceremony and I am very upset…

Is it God punished me for the overly ambitions name of the phonostage – “The End of Life Phonostage” or is it some kind of sarcastic message of him for my arrogant treatment of the phonostage as the last statement of pnonocorrector? 

The Cat


Romy,

Your post made me feel so sorry for you. For a moment or two... then I laughed.

I have imaginings of our elderly creator sitting down with his immensely comprehensive LP collection and looking at the latest addition to his collection of ultimate objects of desire, Romy's  ET SU-2 based phonostage. Maybe the provenance is somewhat less christian than he would have wished, but I have no doubt that he will  derive endless hours of pleasure spinning his LPs from now on. Maybe he will feel in such happier spirits that a few less children will die of starvation in the god-forsaken places of the world (which do not include Boston or its suburbs I hasten to add). If that is any consolation...

I have a battery-powered phonostage if you are interested...

All the best
Rakesh



03-30-2010 Post does not mapped to Knowledge Tree
Reggie
Posts 13
Joined on 05-08-2008

Post #: 72
Post ID: 13239
Reply to: 13238
Um, what?
fiogf49gjkf0d
Hi, Reggie here.

Sorry Rakesh, but I have to say; what a smug tosser's answer. What the heck does God and Starving children have to do with his phonostage? Is he supposed to feel guilty for being upset about it being gone and why would you laugh about it?? Really Sorry Romy.. Hope you find it. Really I do...
03-30-2010 Post does not mapped to Knowledge Tree
gormee
Posts 9
Joined on 05-28-2009

Post #: 73
Post ID: 13240
Reply to: 13237
Alternative Transformer
fiogf49gjkf0d

Dear Romy,


I truly am sorry to hear about your loss. You certainly do not deserve this. If it is any consolation you might like to check out

the following website for an insight into the Bent transformers in relation to Expressive. Not sure how much credence you give to the 

info but you have  to start somewhere.


http://www.high-endaudio.com/RC-Step-ups.html


regards,


Gordon 

03-30-2010 Post does not mapped to Knowledge Tree
oxric
Posts 194
Joined on 02-11-2010

Post #: 74
Post ID: 13241
Reply to: 13239
Sorry to have upset your sensitive self, Reggie.
fiogf49gjkf0d
 Reggie wrote:
Hi, Reggie here.

Sorry Rakesh, but I have to say; what a smug tosser's answer. What the heck does God and Starving children have to do with his phonostage? Is he supposed to feel guilty for being upset about it being gone and why would you laugh about it?? Really Sorry Romy.. Hope you find it. Really I do...


Hi Reggie:

Like most people out there, I happen to have to face all sorts of unnecessary stresses in my life on a routine basis, and must say that humour or a sense of perspective do more wonders for me than 'Really Sorry Romy...Really I do', with the effusive ellipsis.

Let me give you an example or two. You are having a nap on a hot summer's day and wake up to find your house on fire, manage to escape but with all your worldly possessions, gone. How about waking up in the morning and finding that your house has been burgled during your sleep, a lot of your equipment stolen, including all  the thousands of photographs of your little ones, including the camera, laptop and back-up hard drives where they were stored?

Regards
Rakesh



03-30-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 75
Post ID: 13242
Reply to: 13241
A stimulation by Gog's fiction?
fiogf49gjkf0d
Rakesh, yes, this is what upsets me – the fact that I do see a lot of God’s irony in the event and in a way I find it … stimulating.  Hey, I do not even believe in “God” but I find it stimulating.

Thanks, Gordon. I do (did) have the Bent transformer – it was not even remotely close to Expressive. You need to be careful with Arthur’s writing. 10-12 years ago Arthur’s writing had some rational, was it right or wrong, agree one with him or not but it was more or less lucid and cogent. Then Arthur shot himself in the foot and begun to develop a “brand” around his view and it become boring. I generally have tendency to read what people write for themselves not for others. Otherwise prefer to read function and I know much more interesting fiction writers then Arthur Salvatore….

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
03-30-2010 Post does not mapped to Knowledge Tree
Wojtek
Pinckney (MI), United States
Posts 178
Joined on 09-01-2005

Post #: 76
Post ID: 13243
Reply to: 13242
Hmmm,I suspect
fiogf49gjkf0d
It was an agent of Oswald Mill in mover's disguise. He didn't take PSU because it's not tube rectified. On a serious note I do hope that you'll be able to find it somehow burried in the stuff ,or it will miraculously appear on your door step.
Regards, W
04-07-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 77
Post ID: 13263
Reply to: 13237
The "End of Life Phonostage” is back.
fiogf49gjkf0d
Ok, I did find the phonostage. It was sitting in one of the drawers. I do see a rational for me to put in there- to make sure that it would not be shacked during remodeling but, kill me, I do not remember I put it in there. Anyhow, it is back and it is good – that is all that matters.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
04-19-2010 Post does not mapped to Knowledge Tree
AlexBerger
Israel, Beer Sheva
Posts 20
Joined on 04-19-2010

Post #: 78
Post ID: 13308
Reply to: 13263
My "End of Live" vesrion.
fiogf49gjkf0d
Hello Romy,

I just have build the postage used your "End of Live"  scheme and Altec step-up transformers.

http://picasaweb.google.com/alex.berger73/Phonostage#

I have original EAR.
After of 100 hours of working, the new Phonostage  sounds more dynamic, transparent with much better separation.
One problem is 100Hz hum. I did hitter supply filter with too weak ripple filtration: C-L-C (13200uF-3mH-6600uF).
Now I going to rebuild  hitter supply.
Is any difference in sound of semiconductor stabilization filtration, C-L-C-L-C or L-C-L-C filtration?

Best Regards,
Alexander.
04-19-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-27-2004

Post #: 79
Post ID: 13310
Reply to: 13308
The 100Hz hum?
fiogf49gjkf0d

 AlexBerger wrote:
Hello Romy,

I just have build the postage used your "End of Live"  scheme and Altec step-up transformers.

http://picasaweb.google.com/alex.berger73/Phonostage#

I have original EAR.
After of 100 hours of working, the new Phonostage  sounds more dynamic, transparent with much better separation.
One problem is 100Hz hum. I did hitter supply filter with too weak ripple filtration: C-L-C (13200uF-3mH-6600uF).
Now I going to rebuild  hitter supply.
Is any difference in sound of semiconductor stabilization filtration, C-L-C-L-C or L-C-L-C filtration.

Alexander, are you sure that it is 100Hz hum but not 120Hz hum? Even I do not like and tend do not use CLC supply for filaments but your hum most likely is NOT due you your PS. The 13200uF-3mH-6600uF is enough to drive the ripples low and kill the hum.

It is VERY difficult to debug any devise “over the phone” in search of hum. Hum is most likely some kind of ground loop and you need to find it yourself. Pay extra attention to the wiring diagram of the old Altec step-up transformers. I have some of them (Altec and EV) and they are in my view need to use extra shielding and they are very difficult to make them to be quit.

What you need to do for sake of simplicity is take a wire of 2 feet long and begin to short different sections of your new pnonocorrector grounds. Soon on later you will find the location that after they were shorted minimize the hum. This will give you an answer where the hum comes from. I would do it separately for the pnonocorrector and then what I find the absolutely silent configuration, only then I would put the transformer to the game.

Also, considering the proximity of the air caps to the filaments I would VERY strongly advise to use twisted pair for filaments. The twisted pair is very singly but it is VERY effective as it is self-shielding. You can detect if the hum come from air caps by disconnecting them. Also use the “disconnecting trick” to see if the problem comes from the filaments. When you turn off the corrector off then it will be still a second or two operational. You will be able to hear how the hum will change in the moment of disconnection. Remember, what you disconnect the B+ still there and the tube is still hot but there is no filament voltage…

Rgs, The Cat

PS: I am sorry, I juts realized that you are in Israel and you might have 50Hz power line. Then sure you will have 100Hz hum not 120Hz as we have here in US.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
04-19-2010 Post does not mapped to Knowledge Tree
AlexBerger
Israel, Beer Sheva
Posts 20
Joined on 04-19-2010

Post #: 80
Post ID: 13311
Reply to: 13310
Hum “disconnecting trick”
fiogf49gjkf0d
Romy,
I tried before to cover transformers by foil sheet, it didn't help.
Now I try “disconnecting trick”. The hum was disappeared after phonostage had switched off, while music continued to play.
The filament ripple is 32m Volt (5% from DC level). It can be caused the hum?

Thank for your help,
Alexander.

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   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Where are our good phonostages?..  Omnigon Tubes...  Analog Playback Forum     61  638399  05-31-2004
  »  New  The Expressive Technologies SU-1..  “too bright” or “resolution” or “details” with SUT prim...  Analog Playback Forum     33  361519  12-30-2004
  »  New  EAR 834P Modification Guide..  The cap will not change volume in the pass band...  Analog Playback Forum     45  615938  02-09-2006
  »  New  My Analog Playback: the fat lady has sung..  My analog setup update....  Analog Playback Forum     9  115157  04-04-2006
  »  New  Phono stages with SU-1..  SU-1...  Analog Playback Forum     4  63748  11-23-2007
  »  New  Chasing utopian better phono interconnect...  Did I miss something?...  Analog Playback Forum     6  106897  06-05-2008
  »  New  Buying a last cartridge...  Lucky you...  Analog Playback Forum     80  779373  09-05-2008
  »  New  EAR 834P mods..  The cap will not change volume in the pass band...  Analog Playback Forum     45  615938  11-04-2008
  »  New  AMR PH-77: just another phonostage or more?..  Oh, yeah... the sound of the Thing Itself......  Analog Playback Forum     11  126919  07-05-2009
  »  New  An interesting Russian pnonocorrector...  Uber-tweeky phono topologies deconstructed...  Analog Playback Forum     9  95070  03-01-2010
  »  New  Expressive Technologies SU-1 and cartridge output and i..  MV and Ohms...  Analog Playback Forum     2  31923  07-07-2011
  »  New  How to run MM-type cartridge into MC phonostage?..  Quite interesting....  Analog Playback Forum     6  64077  11-13-2011
  »  New  The tales of two phonostages: Allnic and 834PT...  The tales of two phonostages: Allnic and 834PT....  Analog Playback Forum     0  22388  12-21-2011
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