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Thread: Electronumpty's Bigbottle MC phono blowout!

  1. #71
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

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    Looking good!

  2. #72
    Join Date: Jan 2014

    Location: london se6

    Posts: 870
    I'm AndyElectroNumpty.

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    Finally finished the board ! Will attach the rest of the power caps once I have finalised the case. Need to concentrate on that now lol!

    Sent from my SM-G950F using Tapatalk
    At the cutting edge of Numptyness!

  3. #73
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

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    Haha,

    I love it.

    Getting close now

  4. #74
    Join Date: Jan 2014

    Location: london se6

    Posts: 870
    I'm AndyElectroNumpty.

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    Quote Originally Posted by Bigman80 View Post
    Getting close now
    Whoa ! Steady there....lol

    Will have to pick your brains re wiring later some time.
    At the cutting edge of Numptyness!

  5. #75
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

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    Quote Originally Posted by smangus View Post
    Whoa ! Steady there....lol

    Will have to pick your brains re wiring later some time.
    No worries.

  6. #76
    Join Date: Jan 2014

    Location: london se6

    Posts: 870
    I'm AndyElectroNumpty.

    Default Oscillation risk?

    I have been very kindly and nicely advised by a a fellow AOSer that lifting the valve bases off the PCB using leads may lead to the risk of oscillation and unwanted RF pick up with the BBC world service (my words not his ) or some such coming through instead of clean vinyl style tunez

    To prevent this I will need grid stopper resisters near the valve bases it seems and so I'll have to read around the subject as this is way too techy for me atm

    In the mean time any thoughts/advice most welcome!

    If it comes to it I can always move the valve bases back to the PCB, which would be a shame but not a disaster!

    Cheers Electronumpty!
    At the cutting edge of Numptyness!

  7. #77
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

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    Quote Originally Posted by smangus View Post
    I have been very kindly and nicely advised by a a fellow AOSer that lifting the valve bases off the PCB using leads may lead to the risk of oscillation and unwanted RF pick up with the BBC world service (my words not his ) or some such coming through instead of clean vinyl style tunez

    To prevent this I will need grid stopper resisters near the valve bases it seems and so I'll have to read around the subject as this is way too techy for me atm

    In the mean time any thoughts/advice most welcome!

    If it comes to it I can always move the valve bases back to the PCB, which would be a shame but not a disaster!

    Cheers Electronumpty!
    hmmm, I didnt think of that, not that i would have lol

  8. #78
    Join Date: Jan 2014

    Location: london se6

    Posts: 870
    I'm AndyElectroNumpty.

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    All part of learning lol. There's me being a smart arse !

    Bloody valve nonsense

    Sent from my SM-G950F using Tapatalk
    At the cutting edge of Numptyness!

  9. #79
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,156
    I'm Oliver.

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    Quote Originally Posted by smangus View Post
    All part of learning lol. There's me being a smart arse !

    Bloody valve nonsense

    Sent from my SM-G950F using Tapatalk
    Lol, it may be fine. There's no guarantee of interference. Especially once it's all cased up. Just something that could happen.

  10. #80
    Join Date: Jan 2009

    Location: Essex

    Posts: 23,201
    I'm openingabottleofwine.

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    Quote Originally Posted by smangus View Post
    Finally finished the board ! Will attach the rest of the power caps once I have finalised the case. Need to concentrate on that now lol!

    Sent from my SM-G950F using Tapatalk
    Why do you want to separate the valve bases from the PCB?

    Quote Originally Posted by smangus
    I have been very kindly and nicely advised by a a fellow AOSer that lifting the valve bases off the PCB using leads may lead to the risk of oscillation and unwanted RF pick up with the BBC world service (my words not his ) or some such coming through instead of clean vinyl style tunez

    To prevent this I will need grid stopper resisters near the valve bases it seems and so I'll have to read around the subject as this is way too techy for me atm

    In the mean time any thoughts/advice most welcome!

    If it comes to it I can always move the valve bases back to the PCB, which would be a shame but not a disaster!

    Cheers Electronumpty!
    It's called the Miller effect: http://www.valvewizard.co.uk/gridstopper.html

    However if you do add grid stoppers, you will be changing Alan's design and perhaps the overall sound. I would suggest you seek Alan's advice.
    Barry

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