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   Home » Off Air Audio» Sansui TU-X1 Broadcast monitor. (47 posts, 3 pages)
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  »  New  The ultimate buffer – light in the end of a tunnel..  A few minor corrections...  Audio Discussions  Forum     36  298698  04-28-2005
  »  New  Where the FM quality comes from?..  Freaking ridicules…...  Off Air Audio Forum     22  142020  11-02-2005
  »  New  How to record FM broadcasts...  Left to center...  Off Air Audio Forum     125  856292  11-04-2005
  »  New  Align your FM tuners!..  The Munich technician?...  Off Air Audio Forum     7  68944  03-27-2006
  »  New  K-Stereo Ambience Recovery Processor..  Peter's UpperBass + K-Stereo Files....  Didital Things  Forum     29  207026  10-04-2007
  »  New  Antenna solutions for FM..  Hurricane Irene ibn Oz in Boston...  Off Air Audio Forum     27  142024  02-21-2008
  »  New  Where are our good Tuners?..  Ok, it did clear the things up....  Off Air Audio Forum     43  309519  03-31-2008
  »  New  Kenwood L-02T and the hype of FM tuners..  Good reception...inferior Sound...  Off Air Audio Forum     2  52703  04-25-2008
  »  New  The FM Stereo and Multiplex MPX decoders..  The new life of Rohde & Schwarz decoder....  Off Air Audio Forum     12  118308  05-02-2008
  »  New  Rohde & Schwarz EU-6201 Tuner..  The Schwarz runs from crystal oscillator!...  Off Air Audio Forum     34  272361  05-07-2008
  »  New  Tuners and digital noise from DAW, A/D and D/A..  Beter installation + more ferrete...  Off Air Audio Forum     10  85862  07-20-2008
  »  New  A tube tuner? REL Precedent 646C..  REL Precedent Report...  Off Air Audio Forum     24  203165  07-28-2008
  »  New  TU-X1 setup..  State of the live broadcast...  Off Air Audio Forum     16  105296  09-06-2008
  »  New  Sansui AU-X1 bomb.....  Sansui AU-X1 bomb......  Audio Discussions  Forum     0  12563  03-25-2009
  »  New  Forward in the past with old radios...  Kitchen radio as a source of immense pleasure....  Off Air Audio Forum     18  115046  01-21-2011
04-01-2008 Post does not mapped to Knowledge Tree
Antonio J.
Madrid, Spain
Posts 272
Joined on 08-16-2004

Post #: 41
Post ID: 7061
Reply to: 7056
AM/FM FA-7 Antenna
Hi Peter, thank you very much for the information. Have you had the chance to try the propietary Sansui antenna with your TU-X1? Do you know if it's an indoor or outdoor antenna?

Rgrds.
04-01-2008 Post does not mapped to Knowledge Tree
peter foster
Australia
Posts 40
Joined on 02-16-2006

Post #: 42
Post ID: 7063
Reply to: 7061
FA-7 antenna
Dear Antonio,  there is a picture of the Sansui FA-7 antenna in the TU-X1 brochure and it definitely looks like it is a small external antenna designed for use in high density accommodation.  I did not try this antenna.  In my situation I have a large amount of roof space to use and we live in a semi rural area so I decided to uses a parallel array of 2 large FM antennae mounted vertically (as opposed to a single FM antenna that is usually mounted horizontally).  The results are very good.  With kind regards, Peter Foster.
04-21-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,652
Joined on 05-28-2004

Post #: 43
Post ID: 7268
Reply to: 6863
The experimental Sansui is back to business.

The life with FM is great – did not play record for a month or so… I was playing with some other tuners that came across Kenwood L-02T and Mono Scott 310. Both were no good.

Anyhow, the experimental Sansui was running all that time. The “tone” at HF got burned and caught on but the low end never was as good as on my original tuner. I returned all “parts upgrade” that I did but it did not help. So, was about to let this tuner go but today I decided to give to the experimental Sansui one more chance. Do not ask me HOW is found it but after 3 hour of trying I did found that the problem was the faulty C605 capacitor. After I replaced it the experimental Sansui was singing very-very nice. I put all parts back and even more. I found a very cool way to push it slightly further: I bypass the out 5uF caps (C17, C19, and C15). The tuner has IC in out stage and the blocking caps block DC from the IC. I measured the DC as it was 480mV. I figured: so what?

I tried and I heard no clicks – no surprise: I greatly attenuate the signal in my preamp to run my system. So, I was running Sansui DC-coupled with no caps after output state. Great improvement in upper range – love it! I will probably convert my original unit to the same tweak.

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
05-01-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,652
Joined on 05-28-2004

Post #: 44
Post ID: 7344
Reply to: 7268
The Experiential Sansui takes the lead and gets a new duty.

It is infesting how the FM glory is pushing aside my interests in other media. Anyhow after many experiments and “tweaking” my Experiential TU-1X not juts equal to the original in Sound but suppresses the original and it has became my reference recording source (I my post some examples of the records from the last week). So, I am very glad that I did not get rid of my Experiential Sansui after the initial unsuccessful attempt.

However, the Sansui TU-1X tail is not over.  With all simplicity and un-sophistication the TU-1X it turned out to have an amazingly good sounding multiplex decoder. I am experimenting now with front-end with IM section that is more capable then Sansui TU-1X but it is VERY hard to beat the TU-1X stereo decoder. The basic battle now is between the old switching multiplex and the newer PLL decoders. Sansui TU-1X uses the HA-11223W chip to extract stereo from 19kHz. It is $3-worth chip but it so beautiful sounds!!! If my other method will not be able to defeat the TU-1X’s stereo decoder then I will use other TU-1X’s juts as the multiplex stereo extractor and output stage. It is too big and probably it would not be difficult to rebuild it from scratch but I do not want to do it myself. If any of you know an interestingly sounding PLL stereo decoder around the HA11223W then let me know. For the time being I will be using the F2972 board of my Sansui TU-1X…

Theoretically it would be a good idea to switch TU-1X’s output section to work delectably from internal or from externals sources but would like in no way to degrade the original TU-1X sound form the internals IM section. Perhaps in the future is the Sansui will be the uncontestable multiplex extractor winner then I will go to this direction…

Rgs, Romy 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
12-04-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,652
Joined on 05-28-2004

Post #: 45
Post ID: 9085
Reply to: 4649
Sansuis, Telefunkens and Accuphase
fiogf49gjkf0d

 doug s. wrote:

re: my tu-x1, yes, it's a fine sounding beast.  unfortunately, i cannot give you any info re: how it sounded before mods; when i bought it, it was japan-spec - 76-90mhz tuning band, 50us deemphasis and 100v.  i had it sent directly to joseph chow, a former kenwood tuna engineer, who now owns audio horizons/component plus; a mfr and refurb/mod outfit.  i had him conwert it to usa spec, including the tuning dial.  and, as long as he had it, i had him refurb it and mod it, per his premium mod package, which can be seen here:

http://www.componentplususa.com/pages/upgrades.html

it's funny, he actually has a pic of my tuna on his main component plus page - i recognize it cuz he sent the pic to me; i told him it was unacceptable, i wanted the tuning dial to look exactly like standard production, not the black/white dial as shown in the pic.  so, he had to re-do the dial. 

http://www.componentplususa.com/pages/componentplus.html

Hm, the conversion from Japan-spec to US-spec was a hell of a work! BTW, do not agree with all modification they propose.

 doug s. wrote:
anyway, this is a fine sounding tuna.  but, i am not sure it is better than my stephen sank modded and refurb'd harman kardon citation 18 - a direct a-b would be necessary, and i haven't taken the time to do it.  i suspect that my tu-x1 might even be able to be taken further; i have seen an on-line documentation where someone re-built one practically from the bottom up, w/only the best parts...

(stephen sank's home page):
http://www.thuntek.net/~bk11/home.htm

I do not know anything about Harman Kardon and I quoted it in order to keep your comment in this thread.

 doug s. wrote:

i suspect the tu-x1 *might* have a tiny edge in the lowest bass response, but if it is, it ain't by much.  considering how relatively cheap the hk 18 is, even after mods, i'd recommend it as a freaking bargain.  as is the tu9900, after mods.  the tu-9900, i know gives up the tiniest bit of low-end bass to the tu-x1, but it is so much nicer looking, and a bit easier to place on a rack - the tu-x1 is huge.  now, i also had a stock tu9900; mods improved this one a *lot*.  the one i have now was first worked on by mr chow, then its owner sent it to mike williams at radio-x-tuners, for further filter mods.

http://radioxtuners.com/

I heard a lot of good comment about modified TU-9900. I never had it and never heard it. I need to look at it’s circuit to see what it have in there.

 doug s. wrote:
now, i also have read with interest your comments about the r&s ballempfanger; i once owned (since sold) a telefunken ebu 3137/3 ballempfanger; it was a fine sounding and receiving piece, thru a slightly modded studio-12 stereo mpx decoder, but it was no better than my hk 18...

http://www.ak-tubes.de/Tuner/Ballempfaenger/Telefunken_EBU/ebu.htm

have you ever heard a rotel rht-10?  my stock unit sounds wery nice indeed; i have heard that, after mods, it is likely even better than an accuphase t109v, sansui tu-x1 or kenwood l-02t.  i am wanting to get mine modded.  and, i also want to try an accuphase t1000; thru a dac, it is supposed to be a significant step up from the standard "holy grail" tuna offerings...

I was thinking about Telefunken EBU 3137/3 and was very attracted by nevistor front-end but studying circuit my advisers did not recommend me to do there as it was more primitively made machine compare to R&S. I never had it as result. I was not a big fun of Kenwood L-02T. The folks from FM Tuners made from it some kind of kitsch cult but in fact I feel that it was not good tuner that turned in absolute shit as soon PLL was activated in narrow mode. I did not heard the Rotel RHT-10 and also would like to heard the new Accuphase T1000. It is kind of sad, the US rep has none of them in stock, no trail program and no ability even to support conversation about FM and tuner intelligently. The tuner is 6K and to buy it blindly from a completely moron is not a good idea. I know that there is in Boston two Accuphase T1000 but I do not know those people. It would be very interning to hear what this Accuphase does.  Hey Bostonians, if you are one of the guys who have Accuphase T1000 then get in touch with me and I will try to make the acquaintance mutually beneficial.

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
12-05-2008 Post does not mapped to Knowledge Tree
doug s.
Posts 5
Joined on 12-03-2008

Post #: 46
Post ID: 9086
Reply to: 9085
Misc tuna fishin'
fiogf49gjkf0d
romy, there is a tuna freak in los angeles who insists that the only way to get the best sound from the l-02t is to use kenwood's proprietary cabling.  i dunno, i have never tried one.  i have tried two earlier analog kenwoods; my experience is they need serious mods to sound good.  then, they really do sound quite good.

rick from allegro sound in los angeles:

http://www.allegrosound.com/

(rick, btw, bugs me every so often; he really wants to buy my rotel rht-10...  Wink )

i also noticed you mentioned the scott 310 earlier in this thread; i had two 310d's, supposedly the best of the 310's, and w/their outboard 335 mpx decoders, supposedly scott's best offerings, even better than the all-in-one stereo 310e.  that is, their best, except for the 4310, which i have never heard, and usually sells for quite a bit more than the marantz 10b.  anyways, one set of 310d/335 mpx's i owned was refurb'd and modded by foster blair, supposedly the best scott tech.  while it sounded nice, the combo didn't compare w/other wintage tubed tunas i have heard.  and, i have three more modern solid state mpx decoders that all sound better than the refurb'd 335, and a stock fisher mpx100 i also own.  if you want truly superb sound from a tubed tuna, get a sherwood s3000lll, iv, or v, preferably properly refurb'd.  the lll is usually mono, sometimes it has an onboard mpx added, but mostly not.  the iv & v are stereo.  (and the s2100-ll is an s3000v w/the addition of am.)  in any ewent, i have a never-serviced s3000lll mono, and a refurb'd s3000v; these sound as good as any tuna i have ever heard.  seriously.  (s3000lll used w/studio-12 decoder.)  they aren't as sensitive or selective as better solid state tunas, obviously, but still quite decent reception.  for equivalent sound but positively mediocre reception, try a stromberg carlson sr445 w/outboard mpx...  (or the more rare sr443, which is the half-chassis fm-only iteration.)  and, there's an interesting thread about someone who went crazy on a dynaco fm3 and says it's now better sounding than his tu-x1. i have one similarly modded, but not quite so extreme; i haven't given it a proper audition cuz its sensitivity is too poor for me to use it in my present difficult reception conditions, conditions that don't faze my sherwoods in the least... (i can't use my stromberg carlsons here, either...)

http://www.head-fi.org/forums/f30/review-sansuitu-x1-dynaco-fm-3-leak-throughline-2-a-202931-print/

yes, it's a yob to conwert a japan spec tuna to usa-spec.  i can't remember exactly, but mr chow charged me ~$350 to do it, iirc.  he said "never again", but that was changing the dial-scale - he says it's not difficult to change out a tuna if you don't mind not having the dial scale correct!  Wink  he had also done the same conwersion and mods for me, w/an accuphase t109; this one was easier, cuz it inwolwed only swapping out a module to get the tuning right, but the difficulty was getting the module - accuphase is wery shitty when it comes to conwerting their gear; they refuse to sell the parts.  mr chow knows someone in japan who was able to sneak the module out in a larger order, but it took him almost a year to get it.  the modded t109, btw, was not as nice sounding as my hk 18 - its soundstage was slightly wider, but also shallower, not as tall, and the timbre and detail of the hk is better...  also, i am interested in what you think mr chow does that is not a good idea...

another excellent tuna worth seeking out is the aiwa at9700u - tho in stock form it is not quite up to my tu-x1, it's close, and it's an ergonomic pleasure to use.  it's another one i wanna send out for mods...

best,

doug s.
12-05-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,652
Joined on 05-28-2004

Post #: 47
Post ID: 9088
Reply to: 9086
Replace all audio coupling...
fiogf49gjkf0d

Doug, it is a lot of tuner went over your hand. I wonder what drove you to do so.  Was any specific quality of sound that you were looking and the tuner that you own did not serve you?

 doug s. wrote:
romy, there is a tuna freak in los angeles who insists that the only way to get the best sound from the l-02t is to use kenwood's proprietary cabling.  i dunno, i have never tried one.  i have tried two earlier analog kenwoods; my experience is they need serious mods to sound good.  then, they really do sound quite good.

I am sorry to say it but this “freak in los angeles” is  a moron if he converts the sonic and performing characteristics of  L-02T only into the “Kenwood's proprietary cabling”. It is the same as the fools who power these amps with AC that has 20% of sinusoid distortion and claim that it might be “improved” if used a “better” power cord. I wionder why O so love all that crowd. Anyhow, I did have the Kenwood's proprietary cables with my L-02T

 doug s. wrote:
i am interested in what you think mr chow does that is not a good idea...

Looking juts at what he said at his site:

**** Replace all audio stage coupling capacitors with coupling grade Blackgate capacitors, which by enhancing the audio transfer efficiency enhance all aspects of the audio performance, especially more body to the lows and more airy highs.

It not necessary true.

*** Replace the power supply capacitors with larger, higher voltage, upgraded capacitors to insure better dynamic range and tighter, more controlled bass response.

And how higher voltage capacitors would “better dynamic range and tighter, more controlled bass response”?

*** Upgrade the existing grungy chrome RCA fixed outputs and skimpy wire with new gold plated Teflon RCA outputs and new high Q Teflon wire run from the new RCA’s to the PC Board).

Yes, the change of the RCAs is good thing but the right new RCA must be used. Good RCA are not sexy and they never used by the update people. The update people put in play the expense RCA with large mass of negative terminal and they are bad. A right RCA terminal shell not change the thickness of the wire that goes before and after. Most of the “expensive” audiophiles RCA jacks do. Changing the wire better might be a good thing but he did not mention other things hat need to be done with those output wires - this might me nerves.

*** Replace the audio stage Op Amp IC’s with Burr-Brown or equivalent, using a plug in socket so when improved Op Amp IC’s become available, the old ones can be removed and the new ones easily inserted. Improved Op Amp IC’s improves all aspects of the sonic performance.

Possibly. Still it shell be used very accurately.  Many of old time use vintage “slow-running” op-amps and nowadays the op-amps much faster. There are some designers who do prefer older slow amps and there is some merits in it. However,  to have the op-amps swappable is a good feature.

*** Check narrow and wide band IF filters. Replace if necessary. Often the filters in these units are of higher quality than many currently available filters, so they should not be replaced unless they are bad.

Does he converts ceramic filters into LC filter too?

*** Replace DC power supply rectifier diodes with High Speed Soft Recovery (FRED) Diodes because their fast response time, high current capability, soft recovery and lack of ringing and overshoot place them a big step beyond other high speed diodes in dramatically lowering noise, increasing dynamics, reducing grain and glare.

Not necessarily.  I had in many devises used ultra high speed and under 40mS recovery used and it is not always lead to sonic differences. In fact in SS tuners that uselessly run at low vantages there is no need to use FRED but Schottky, as are much more preferable as they have no “soft recovery” but no recovery at all. Intellectually the FREDs, Schottky or whatever make scene but in practical result it not necessarily affective. With one of my Rohde & Schwarz EU-6201 I did change the PS’s diode from 30-year old “crap” to the  contemporary soft-switching and then to Schottky. I recognize absolutely no sonic effect.

*** Raise up and isolate the transformer from the chassis if there is room in the chassis to do so. This will further reduce the noise level.  Check the lights.  Align the tuner. This is indispensable if the tuner is to perform up to its potential. Clean the exterior and interior of the tuner. Provide an itemized list of parts replaced, including a bag with the replaced wire and replaced parts.

That is all good. I would personally would like them to list the specific points they check during alignment as it would give more indication how serious they are.

*** Replace the 18 awg power cord with an IEC input, which permits us because of the ground, to isolate AC noise. If there is no room to install an IEC socket, a 16 awg upgraded grounded AC cord will be hard wired to the component.

That might be good but it has absolutely nothing to do with “isolation of AC noise”

*** Install a high grade AC line filter in line between the IEC input and the power supply to further reduce line noise.

I would call it controversial and use it very sparingly. Probably the ferrite “generic” filters is better then “high grade AC line filter”. Do they select the filter with respect to the given tuner load? I doubt.

*** Replace and upgrade the wire from the IEC to the Power supply PC Board with low noise, high Q wire. This will result in lower losses and better signal transfer across the entire bandwidth.

OK

*** Replace critical audio path wire with high Q wire and if necessary reroute.

The fact of rerouting is very important, I am glad he mentions it eventually.

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
Page 3 of 3 (47 items) Select Pages:  « 1 2 3
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  The ultimate buffer – light in the end of a tunnel..  A few minor corrections...  Audio Discussions  Forum     36  298698  04-28-2005
  »  New  Where the FM quality comes from?..  Freaking ridicules…...  Off Air Audio Forum     22  142020  11-02-2005
  »  New  How to record FM broadcasts...  Left to center...  Off Air Audio Forum     125  856292  11-04-2005
  »  New  Align your FM tuners!..  The Munich technician?...  Off Air Audio Forum     7  68944  03-27-2006
  »  New  K-Stereo Ambience Recovery Processor..  Peter's UpperBass + K-Stereo Files....  Didital Things  Forum     29  207026  10-04-2007
  »  New  Antenna solutions for FM..  Hurricane Irene ibn Oz in Boston...  Off Air Audio Forum     27  142024  02-21-2008
  »  New  Where are our good Tuners?..  Ok, it did clear the things up....  Off Air Audio Forum     43  309519  03-31-2008
  »  New  Kenwood L-02T and the hype of FM tuners..  Good reception...inferior Sound...  Off Air Audio Forum     2  52703  04-25-2008
  »  New  The FM Stereo and Multiplex MPX decoders..  The new life of Rohde & Schwarz decoder....  Off Air Audio Forum     12  118308  05-02-2008
  »  New  Rohde & Schwarz EU-6201 Tuner..  The Schwarz runs from crystal oscillator!...  Off Air Audio Forum     34  272361  05-07-2008
  »  New  Tuners and digital noise from DAW, A/D and D/A..  Beter installation + more ferrete...  Off Air Audio Forum     10  85862  07-20-2008
  »  New  A tube tuner? REL Precedent 646C..  REL Precedent Report...  Off Air Audio Forum     24  203165  07-28-2008
  »  New  TU-X1 setup..  State of the live broadcast...  Off Air Audio Forum     16  105296  09-06-2008
  »  New  Sansui AU-X1 bomb.....  Sansui AU-X1 bomb......  Audio Discussions  Forum     0  12563  03-25-2009
  »  New  Forward in the past with old radios...  Kitchen radio as a source of immense pleasure....  Off Air Audio Forum     18  115046  01-21-2011
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