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Thread: Help Please tell me what this is?!

  1. #1
    Join Date: Jul 2020

    Location: Mersyside

    Posts: 18
    I'm Nick.

    Default Help Please tell me what this is?!

    Hi Guys

    I have this Power Amp I thought it was a Quad 303 as it pairs with a Quad 33 but its NAS has a sticker saying Nottingham Audio Services under it S/N 721

    It Says NAS 70 + 70. It looks so much like a Quad 303 just bigger.

    Anyone know anything about this amp?

    Thanks

    Nick

    NAS 1-min.jpg

    NAS 2.jpg

    NAS 3.jpg

    NAS 4-min.jpg

    IMG_9571[1]-min.jpg
    Last edited by Nickkip; 06-07-2020 at 18:12.

  2. #2
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

    Default

    picture might help.. may just have been serviced there
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

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  3. #3
    Join Date: Jul 2020

    Location: Mersyside

    Posts: 18
    I'm Nick.

    Default

    Sorry was trying to get them to upload have got 2 up the ones showing the case keep failing to upload

    Think it was the 2mb limit on the file size.

    Up Now

    Some more of the inside.
    IMG_9569[1]-min.jpg

    IMG_9571[1]-min.jpg
    Last edited by Nickkip; 06-07-2020 at 18:12.

  4. #4
    Join Date: Feb 2016

    Location: London

    Posts: 876
    I'm Don.

    Default

    Could be a 303 clone? Poss DIY job?

    Sent from my ONE A2003 using Tapatalk

  5. #5
    Join Date: Jul 2020

    Location: Mersyside

    Posts: 18
    I'm Nick.

    Default

    Thank you for you reply.

    Been doing some searching online and the case seems to have been brought from the below advert, from a RC 1976 image below

    Capture.jpg

    Image came out small its on page 64 of

    https://worldradiohistory.com/UK/Rad...RC-1976-05.pdf

  6. #6
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,848
    I'm openingabottleofwine.

    Default

    I don't think it's a Quad 303 clone.
    Barry

  7. #7
    Join Date: Jul 2020

    Location: Mersyside

    Posts: 18
    I'm Nick.

    Default

    Hi after hours of searching I found this when googling the transistor from another forum..


    Yes, this is the one. I recall Mainline selling 12, 25, 40 and 70 W amplifier kits in the 70's, which I take it are transistor and diode sets for these amps, but I never bought one”

  8. #8
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    A link would be good.

    I googled H&H and WEM images, but I was wrong and obviously didn't find anything.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  9. #9
    Join Date: Jul 2020

    Location: Mersyside

    Posts: 18
    I'm Nick.

    Default

    This is the link when I googled the model on the transistor

    https://vintage-radio.net/forum/showthread.php?p=495170

  10. #10
    Join Date: Jul 2020

    Location: Mersyside

    Posts: 18
    I'm Nick.

    Default

    Im not sure now if its mainline, I have taken it apart and got the boards out.

    On the bottom of the boards the is the words NAS 70w 700mw printed on them.

    Image below.
    WMBA0760[1].jpg

    IMG_9577[1]-min.jpg

    Also any idea were i could get replacement caps for it? tested them one reading 4600uf other 4200uf when should be 3550uf

    when testing the board its a 4 channel amp with bridged RR LL so same sound out of both speakers on a single side, so both right will have the same output and both Left.

    I was going to repair my B&O 5700 and sell them the crossovers on one went on fire , got a good set of B&O 5702's that i needed to replace one cap in the crossover as had lost mid, need to do the rest but going do that when i can find some time..

    Looking at the Amp do you think its got the power to drive the 4 speakers

    photo of my crossover in B&O 5700

    XHAC7844[1].jpg
    Last edited by Nickkip; 07-07-2020 at 15:43.

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