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Thread: The Bug is back

  1. #191
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.

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    Attachment 28590

    Pictures are not that good
    I am lacking the skill of many in this forum Ö

  2. #192
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.


  3. #193
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.

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    DSCF2639.jpg

    I left it for last the last bit of drilling for the transistor mounting


    DSCF2640.jpg

    I am using 2 M5 bolts the kerafol Keraterm 86/82 I am using is good for 60 Nm and has a thermal conductivity of 6.5 W/mK

    Same time ago I was looking for CVD Diamond and at the time it was not made for this application now is available under the trade name Diafilm TM220 whit a conductivity of 2200 W mK (is it real)

    Either I win the lottery or they decide that I had a good idea after all


    But any way compare a M5 bolt to the M3 screw and think about it

    DSCF2643.jpg
    DSCF2644.jpg


    That is where the thermistor go right against the squarish tab camming out of the moss fet body there will be same sort of heat shrink around both to maintain contact

    That is the hottest spot nearest to where all the switching happens


    I seen them all over the place from open air to near the penny washers normally used to fit the dudas

  4. #194
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.

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    Nearly 18 K view's on this tread
    Constructive comments are welcome

    + If any one is interested I can arrange for a group buy for the PCB's and any bits and pieces


    DSCF2647.jpgDSCF2650.jpg

    One off the 3 box set up

    They are big

  5. #195
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.

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    well over 18K views on this tread
    I feel that I am letting you down
    Thing is I got a new toy today after waiting for over a month for it to be delivered

    I am Waiting for HiFI Dog to pop around and lend same moral support as I am so scared to mess it up when fitting it to the V
    Will let you know how it sounds later 1.1 mV output on the Paradise ???
    And if not the paradise will it overload the XP10?
    But then the F5 need same serious output to be driven DSCF2653.jpgDSCF2655.jpg

    Later Ö

  6. #196
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.

    Default

    DSCF2663[1].jpg
    Just the last hurdle
    I am matching up 300 Mosfets
    I may be same time


    But I am going to take the rest of the day of
    I got a bottle of amarone and a new toy for my birthday



    DSCF2655.jpg

  7. #197
    Join Date: Nov 2020

    Location: London

    Posts: 12
    I'm Max.

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    Hi, if you donít mind me asking - those heat sinks with the wave profile:

    Where did you get them from? Price? Thanks!

  8. #198
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.

    Default

    maximax welcome to AOF
    It all depends on what and how you using them for
    send me a PM whit more info
    In the mean time

    http://www.abl-heatsinks.co.uk/index...ct&product=204

    https://www.gdrectifiers.co.uk/uploa...S685_PS835.pdf

    Here is a link or 2
    I got the ones from link 2 on this build
    In regard to price all I can say is quite a lot
    I have not tried them so far but I can say based on experience that the 170 X 300 is good for twin (2 + 2) mono blocks at 770 mA Bias or quads (4+4) Monos at 770 mA but whit cooling (link 1) £35.26 each

    One thing I can say for sure is that I can not see how the specified parts (on another forum) can possibly work but apparently they do maybe it is all due to the TO3 being fitted whit a single M3 screw and washer

    My old F5 whit over the top sinks and cooper diffusers (400 x 300 single sink 4 mosfets biased at 1200 mA each) run pretty cool till one try a mate Polk cobra speaker cable they get pretty hot on a 3 / 4 hour session but sound so good
    If you get a chance the Cobra is the best speaker cable I have ever tried but it may kill your amplifiers

  9. #199
    Join Date: Nov 2020

    Location: London

    Posts: 12
    I'm Max.

    Default

    Belatedly many thanks for the detailed response. I was aiming to build the sit-3x and a passively cooled Hqplayer PC. However, I have a feeling that work will sidetrack me next year. Anyhow, the development of the sit-3x appears to be dragging on, so no rush.

    Those folks even sell a 10cm deep heat sink:
    https://www.bal-group.com/heatsink_detail/240
    No idea about prices.

  10. #200
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 492
    I'm Sandro.

    Default

    DSCF2667[1].jpg

    Just matched 200 FQA1920C and got lucky whit this batch any of the rows is matched at 500 mA at 50 C
    The I run a test whit the DCA Pro DCA75 and pick the 4 s' I need

    I still have to do a couple more runs on the FQA12P20 batch

    I have same spares if any one is interested

    I decided to get the trafos as well before brexit just in case I had to pay import duty on those

    What no one told you that you will have to pay taxes when you buy stuff from the EU during the referendum campaign?

    I got a couple of 800 VA 28+28 V toroidy supreme on the way the DC voltage on the rails should be around 38 V say 28 V RMS = 200W on 4 Homs
    The 800 VA will not flinch at running 14 A





    Sit X3 love to ear it when is done
    Yes was looking at that sink as well If i remember is not wavy surface area is what matter are you going to force cool it whit fans ?

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