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Courtiestown - Naim Amplifier (Avondale) Upgrade Project

Discussion in 'd.i.y.' started by Richard Lines, Dec 7, 2021.

  1. Pete MB&D

    Pete MB&D Pete Maddex, the one and only!

    Loads of bolts on eBay at good prices.


    Pete
     
  2. Richard Lines

    Richard Lines pfm Member

    Pete,

    Indeed there are but the source of said items???????

    Regards

    Richard
     
  3. Pete MB&D

    Pete MB&D Pete Maddex, the one and only!

    I have been buying Chinese stainless steel ones for my Hackernaps, I guess RS need to justify there vastly expensive prices some how.

    Pete
     
  4. Richard Lines

    Richard Lines pfm Member

    Pete,

    Quick check on eBay. 100off M3 x 20mm pan head screws £5.52 (inc. 'free' postage), RS £5.93 so if already making an RS order.................. That isn't to say RS can't be beaten more substantially.

    I have spent hours chasing down 'cheaper' prices but you also need to ask what your own time is worth doing the searching to save, in some cases, pennies?:D

    Regards

    Richard
     
  5. Richard Lines

    Richard Lines pfm Member

    Good Afternoon All,

    I'm currently going around in ever decreasing circles on the LED front.

    Both CAP6's are identical in that:-

    1. The PCB's are the same
    2. They are fitted with identical components throughout i.e diodes, capacitors, LED load resistors and LED's
    3. The LED dropping resistors are as shown in a previous photograph at 20k
    4. On one board the LED's light up quite happily and on the other not.

    Without thinking to try them out I have fitted 'new' LED's and still no joy.

    More head scratching. Tested the LED's that have been removed as 'non-functional' and they test good on my Fluke and light up red at 1.65V and green at 1.85V.

    I've come away from it for a while to type this EM and have a beer whilst considering what I am missing, help definitely required.

    Regards

    Richard
     
  6. Richard Lines

    Richard Lines pfm Member

    Good Evening All,

    So tonight's question is when is a plated through hole not a plated through hole??????????

    The next photograph tells all:-

    [​IMG]

    It's not overly pretty but:-

    [​IMG]

    The LED's now light up......................................

    PCB's back in the box and I'm getting ±51.5V and ± 58.7V.

    Regards

    Richard
     
    Last edited: Mar 7, 2022
    Mike Hanson likes this.
  7. Marra

    Marra pfm Member

    chiily and Mike P like this.
  8. 337alant

    337alant Negatively Biased

    Hi Richard
    20k is maybe a bit high, 2.7K @ 53V supply will light the LED @20ma, 3k @ 60v, 4.7K will give you a dim light and a good bleed resister when switching off
    Anything up to 10K would work and I would use the same colour LED for both + & - phase

    Alan
     
  9. Richard Lines

    Richard Lines pfm Member

    Those are quite good prices, just ordered some M3 x 20mm.

    Currently sat listening to London Grammar's 'Truth is a Beautiful Thing', where the hell was that bass hiding under the Naim amplification??? Bearing in mind the rear woofers are still driven by a NAP250 - possibly to be changed by this time tomorrow.

    Regards

    Richard
     
    Marra likes this.
  10. Richard Lines

    Richard Lines pfm Member

    Good Morning All,

    Have listened to a couple of 'go to' tracks this morning i.e. Madonna's 'Drowned World/ Substitute for Love' and Lady Gaga's 'Always Remember us this Way', something substantial has changed on the bass front. OK the streamer is at a volume level of 80 but the bass is literally 'crawling out of the floor' and is under near complete control.

    I must go and let the horses out and get on with assorted chores, I can't just sit here listening to music...........

    Regards

    Richard
     
    Mike Hanson likes this.
  11. Richard Lines

    Richard Lines pfm Member

    Good Afternoon All,

    Each time I come in for a tea break I'm adding some wiring to the latest amplifier:-

    [​IMG]

    Regards

    Richard
     
    Mike Hanson and laverda like this.
  12. Richard Lines

    Richard Lines pfm Member

    Good Evening All,

    Wiring near completed. A couple of things I need to check before any powering up.

    [​IMG]

    Regards

    Richard
     
    337alant and Mike Hanson like this.
  13. laverda

    laverda pfm Member

    Richard,

    RICHARD……

    don’t forget to separate the PSUs on the board (cut the link) … or you let the smoke out.

    Graham
     
    337alant and Mike Hanson like this.
  14. Richard Lines

    Richard Lines pfm Member

    Graham,

    [​IMG]

    That's all four links cut.

    Still got to double check the wiring again later this morning.

    Also need to work out quite how you attach the feet.........., I clearly need to look out the box I bought off you or the video's......

    Regards

    Richard
     
    Mike Hanson likes this.
  15. laverda

    laverda pfm Member

  16. Richard Lines

    Richard Lines pfm Member

    Good Afternoon All,

    Box arrived from Digi-Key this morning:-

    [​IMG]

    Lots of bits maybe????????

    [​IMG]

    No just two back order Zeners - a case of excessively large packaging???????

    Regards

    Richard
     
  17. James Evans

    James Evans Bedroom Bodger

    Maybe not advertise your home address and phone number on the internet?

    Agreed though, ridiculous packaging.

    Edit, just realised, that's most likely not your home address is it!
     
    337alant likes this.
  18. Richard Lines

    Richard Lines pfm Member

    Good Afternoon All (again),

    The house address is well known in various quarters not least of which when I was Secretary of a Land-Rover club and it is also a listed business address for my (limited) business in the marine world.

    Have just completed another check of board/amplifier wiring so will shortly power this thing up........., still time for another mug of tea though. This picture from this morning after the bottom panel was fitted c/w anti-vibration feet including felt pads:-

    [​IMG]

    Regards

    Richard
     
    Last edited: Mar 9, 2022
    martin clark, Mike Hanson and laverda like this.
  19. Richard Lines

    Richard Lines pfm Member

    Good Evening All,

    There's been a setback today in that I finally decided to get on with powering the amplifier up and almost immediately it was apparent that something was amiss. I was seeing circa 2.2 - 2.3V bias but was seeing very high voltages on the speaker terminals i.e. -38V one side and -49V the other.

    I have been in contact with Graham and will be carrying out further investigations tomorrow.

    I'm not too disheartened more mystified. I see the stereo 'Voyager' as a more 'complex' build than this amplifier.

    Having gotten to the bottom of the power supply issues I was quite happy that they were performing correctly.

    At no point was any power knowingly applied to the NCC300 boards before the links were cut. Everything was 'dead' as the loom was made up.

    Graham assures me the boards worked when they left him.

    In terms of power there are only 7 connections to the boards. A positive, negative and earth to the MiniCap6 from the regulator side of the board and a positive, negative and two earths from the top half of the board to the CAP6. TBH just how difficult can it be?????

    The wiring has been checked repeatedly. The link cables I've made up as part of the loom have all been tested for continuity. That they go from and to the correct location has been checked repeatedly.

    Having said this something has taken out both boards.

    Suggestions welcome.

    Regards

    Richard
     
  20. Mike P

    Mike P Trade: Pickwell Audio

    Marra and gavreid like this.

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