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Amplifier Transformer Group Buy

Discussion in 'd.i.y.' started by 337alant, May 15, 2021.

  1. 337alant

    337alant Negatively Biased

    My two transformers arrived today, Stephen sent me mine to check before he made the rest.
    I wired them up and they are perfectly silent on my 242.5 Mains, I tried them on the 230, 240 & 250 setting and they were silent and don't get hot .
    All secondary's are centre tapped except for the single 0-12

    On 240VAC setting I got the following from each secondary
    35VAC 1 = 36.6-0-36.6 (73.5) +4.5% unloaded
    35VAC 2 = 36.6-0-36.6 (73.5) +4.5% unloaded
    42VAC 1 = 43.5-0-43.5 (87.3) +3.6% unloaded
    42VAC 2 = 43.5-0-43.5 (87.3) +3.6% unloaded
    12VAC = 12.8V

    On 230VAC setting I got the following from each secondary
    35VAC 1 = 38-0-38 (76.4) +8.6% unloaded
    35VAC 2 = 38-0-38 (76.4) +8.6% unloaded
    42VAC 1 = 45.3-0-45.3 (90.9) +7.8% unloaded
    42VAC 2 = 45.3-0-45.3 (90.9) +7.8% unloaded
    12VAC = 13.3V

    On 250VAC setting I got the following from each secondary
    35VAC 1 = 35.2-0-35.2 (70.4) +0.5% unloaded
    35VAC 2 = 35.2-0-35.2 (70.4) +0.5% unloaded
    42VAC 1 = 41.7-0-41.7 (83.7) -0.7% unloaded
    42VAC 2 = 41.7-0-41.7 (83.7) -0.7% unloaded
    12VAC = 12.0V

    So overall good readings the secondary's are very even and the regulation seems about right 4.5%

    Ill try some loading tomorrow if I can find the right power resistors

    My only comment is that the goss band is just slipped over the transformer and covered in red electricians tape ?
    I asked for mine in clear tape and the ones I have had in the past the Goss band is under the final wraps of the clear tape .
    I would also expect to see a sticker on there as well to show the secondary colour coding for future ref

    Alan
     
    Mike Hanson likes this.
  2. firestorm

    firestorm pfm Member

    Got my two yesterday. 2 x 400VA. GOSS band is secured by Black fabric finish. A label on the transformers itself would be nice.
    My previous red Aleph J transformer is unlabelled too.
     
  3. say it as it is

    say it as it is pfm Member

    mine is all under the red tape no sticker either a hand written note for colour coding. That was the pair for monos very smart looking and not too big
     
  4. Marra

    Marra pfm Member

    I've had two toroids from Tiger one fully cloth covered including the Goss band and one with it externally pushed on; neither had colour coding labels.
    A quality product non the less.
     
  5. 337alant

    337alant Negatively Biased

    I made up a label for mine and printed it off on photo paper
    I have asked Tiger Toroids to supply one with each transformer, Ill send a copy of the one I have made but he may allready have his own ?
    Anyway this is the one I have done for information only, it won't be the same size in this picture as the word document but it gives you an idea ?

    [​IMG]Tiger torroid sticker by Alan Towell, on Flickr

    Alan
     
    RonR likes this.
  6. firestorm

    firestorm pfm Member

    Photo of my pair.
    [​IMG]
     
    torstoi, laverda and Mike Hanson like this.
  7. bugbear

    bugbear pfm Member

    I've stared, and tried to think. But, no, I've got to ask.

    What's the underlined wire pair mean (yellow-red and black-orange) ?

    BugBear
     
  8. 337alant

    337alant Negatively Biased

    Ah sorry my bad that's just Word telling me its not grammatically correct, the final version doesn't show the underlines, like this

    [​IMG]Tiger torroid sticker by Alan Towell, on Flickr
     
    bugbear likes this.
  9. 337alant

    337alant Negatively Biased

    Stephen told me he would get all the transformers out over the next 2 weeks
    There is a Neoprene Rubber mounting pad but there was no M8x30mm bolt and washer for the transformer
    He says he doesent have any so we will all have to get our own ?
    He has no problem with us using the sticker that I made up so if anyone wants the word version send me your email address or save the picture posted and resize it to suit and print it off.
    Alan
     
    Mike Hanson likes this.
  10. 337alant

    337alant Negatively Biased

    Just an update from Tiger toroid's all transformers are wound, just need potting.
    All will all be delivered next week

    Alan
     
    bugbear likes this.
  11. chrisn

    chrisn pfm Member

    Thanks Alan, good work. Will TT invoice us individually?
     
  12. 337alant

    337alant Negatively Biased

    No they have already been paid so you just have to pay me via Paypal PM me
    Alan
     
    bugbear likes this.
  13. S-Man

    S-Man Kinkless Tetrode Admirer

    Mine arrived today.

    Thanks to Alan and Stephen at Tiger.
     
    337alant likes this.
  14. eddie pugh

    eddie pugh pfm Member

    Mine arrived today.

    Really heavy lump Not opened it yet

    Many thanks Alan

    eddie
     
    337alant likes this.
  15. say it as it is

    say it as it is pfm Member

    Had a parcel wait on my doorstep when I got in tonight after the football lol. Going by weight has to be the tx
     
    337alant likes this.
  16. RonR

    RonR pfm Member

    Mine arrived today too, looks like a nice piece of kit, not tested yet.
    Thanks for organising Alan.
     
    337alant likes this.
  17. say it as it is

    say it as it is pfm Member

    Opened mine today looks very smart in black. Need to print off the wiring legend
     
  18. 337alant

    337alant Negatively Biased

    Glad to see them getting delivered :cool:, hope everyone is happy with there transformers.
    Stephen said the red lacquered ones take a few days to dry before potting but should be ready by Monday.

    Alan
     
    chrisn likes this.
  19. S-Man

    S-Man Kinkless Tetrode Admirer

    Mine has been fitted to my Leach amp.
    Hum is very low in level, I can just about hear it with my ear next to the transformer (240V primary)

    First impressions of the sound are very good, maybe a touch more forward in the upper mids compared to Les' EI monster.
    I'm very happy overall!
     
    337alant likes this.
  20. chrisn

    chrisn pfm Member

    Here it is Alan!
    https://www.dropbox.com/s/f2fnw5s7xkomyfi/IMG_1102.JPG?dl=0
    For reference it is 18cm diameter and 7.5cm high
    Set up for testing using the 240V primary I get 50.4 and 50.8V after rectification on the 35V secondaries so that seems right (off load)
    Manages switch on with a 2.5T fuse so far and it's silent
    Those are NCC200s version 1 issue 3 May 2009 - so I think they should work set at 35mA
    I should try powering the front end separately as I have some spare cap6s. But I would need some help
    I will try some disposable speakers later in the week
    I need a two channel DC protection module, always used Velleman before and although there is plenty on this forum there is no definite alternative suggested
    I would like to use the 12V secondary as it is there
    Thanks again
     

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