Advertisement



  1. Things you need to know about the new ‘Conversations’ PM system:

    a) DO NOT REPLY TO THE NOTIFICATION EMAIL! I get them, not the intended recipient. I get a lot of them and I do not want them! It is just a notification, log into the site and reply from there.

    b) To delete old conversations use the ‘Leave conversation’ option. This is just delete by another name.
    Dismiss Notice

Leak TL which decoder?

Discussion in 'classic' started by Linnovice, Jan 26, 2021.

  1. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    We are only talking about a 76KHz oscillator here... not GHz!:)
     
  2. davidsrsb

    davidsrsb pfm Member

    Only 76 kHz on a crude VCO and rather dumb PLL. I am not aware of any tests on how pilot carrier recovery "jitter", due to multipath, adjacent channel interference and so on affects stereo image especially.
    I have only heard a few good tuners, notably Creek and they do get a much better image.
    These days I don't have access to a good source like R3, Malaysian stations are very poor technically.
     
  3. ersel

    ersel Member

    Someone has just snatched the One Thing Audio Decoder before me, at the auction site.
    Looks like no one is making the decoders for the Leak 2 these days.
    Even from the dipole antenna (indoors), the sound is unlike other tuners (I do own one german valve tuner), the only problem with my Leak 2, soundwise ( apart from the low-ish level of the output, but that is another subject) is the flabby and overblown bass.

    And this is (bass response) is a huge problem to me; I have no idea why it occurs and how this is rectified.

    @G T Audio , @Arkless Electronics - do you stil make any of the decoders for this tuner?
     
  4. Big John

    Big John pfm Member

    If you can find one second hand the Tim de Paravicini decoder I have on my TL stereo rewired by TdP as it had no multiplex out normally would use/plug in to the multiplex socket, works brilliantly despite what some of the curmudgeons on this site usually say...
     
  5. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    I never made decoders as a commercial enterprise... just loads of different ones for my own use .
    If all my comments about these tuners actually not being very good in stereo can't put you off then I could build you one as a one off but if you need to ask what it would cost... I will likely have several I made 20 years ago but they will be just the actual decoder and need power supply and amplifiers/buffers before and after the board plus pilot tone filter etc so not much help. In total probably £400+ for me to make you one from scratch and would come with a guarantee that the combination of Troughline 2 and decoder will sound poor... I have about a dozen Troughlines... there's a reason I use modern tuners and internet radio instead ... they sound MUCH better!

    If you must use a Troughline with a decoder then you really need a Troughline Stereo model as a start. Then remove the unusably awful internal decoder and start thinking about external decoders from there. That or do all the updates to the 2 to make it same spec as a Stereo.

    I've never noticed anything wrong with the bass in any of the units I've heard.
     
  6. ersel

    ersel Member

    Well, that is the problem, it is nowhere to be found.
    Tim has left us, for some better place (RIP) just recently, btw.

    I cannot find that decoder, (TdP Ear), Iwould prefer it, although some reports have said that the One Thing Audio is good as well, but now it is gone and vanished, just minutes from me purchasing it.
     
  7. ersel

    ersel Member

    The problem was identical in both of mine Leak TL 2, both in mono and in stereo.
    There have been even some threads elsewhere, dedicated to this very problem, reportedly.

    I do own, and use one small (Cai's) mpx decoder, supposedly optimised for valve tuners.
    It does it's job with stereo, but I have no idea whether the de-emphasis is done for the EU or the US standard.
     
    Last edited: Mar 17, 2021
  8. John_73

    John_73 pfm Member

    Seem to recall that Hi-Fi World offered a DIY supplement with details of a Tim de Paravicini decoder back in the early/mid 90s? My memory might be playing tricks, but pretty sure something was offered... I'll take a look in the loft later on the off-chance I happen to still have the supplement, might be of help.
     
    ersel likes this.
  9. ersel

    ersel Member

    Well, thanks... yes... the lofts and their forgotten secrets...
     
  10. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    There's loads of info around if one wishes to DIY a decoder. all the IC data sheets have suggested circuits but often without the "housekeeping" circuitry and PSU and you could just copy the circuitry in many tuner service manuals.
     
  11. Big John

    Big John pfm Member

    Sounds about right my TdP built at EAR has Hi Fi World on the front.
     
  12. davidsrsb

    davidsrsb pfm Member

    I would look for one with pilot cancellation as the 19 kHz notch filters are unavailable now.
    Alternatively buy a cheap old tuner and cannibalize it.
     
  13. John_73

    John_73 pfm Member

    Found the article. Will get it scanned up and links posted asap!
     
    Stuart Frazer likes this.
  14. chartz

    chartz If it’s broke fix it!

    I have it too but no schematics with precise component values...
     
  15. ersel

    ersel Member

    It has been claimed they they are the best sound quality-wise, even with the external decoder (TdP), in direct comparison.
    There is a dedicated thread on it in another forum.
     
  16. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    They are the worst! Not really suitable for stereo.
     
  17. Vinny

    Vinny pfm Member

    You're wasting your time - preaching to the deaf, I exit long before this stage. If somebody wants to argue black is white............................. just let them carry on. You are better off talking (posting) to a wall.
     
    Arkless Electronics likes this.
  18. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Yes I know! I nearly added some cheeky stuff about "but as you are only listening to those who haven't a ****ing clue you'll not be bothered!".
     
  19. Vinny

    Vinny pfm Member

    Like I said - go talk to a wall.

    I just will not open the thread as I know that I'll get irresistably tempted.....
     
  20. ersel

    ersel Member

    And all of that is, of course, applicable to others, who do not share the same impressions... the gents at the One Thing Audio, the London Sound, Graham Tricker, and some others... I keep an open mind to both possibilities, and then out of nowhere get characterised by the person with (or to) whom I have never spoke a single word (well, never written) anywhere neither here, nor elsewhere...

    Well, nevertheless...

    http://www.adventuresinhifiaudio.co...ne-tuner-compared-part-one-a-flock-of-tuners/

    T
    he article was nice to read, now, I am not implying anything by it, just citing it as an example.
     
    Last edited: Mar 20, 2021
    Big John likes this.

Share This Page





Advertisement


  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice