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Thread: 6J1 Pre-amp modifications (hum removal)

  1. #71
    Join Date: Dec 2016

    Location: Willington, Beds, but France soon...

    Posts: 13
    I'm Paul.

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    Quote Originally Posted by Firebottle View Post
    As bought from here:

    http://www.ebay.co.uk/itm/2917862715...%3AMEBIDX%3AIT




    As standard there is a low level hum present, this is cured by fitting an extra capacitor. You need a 470uF 35V electrolytic, the NEGATIVE lead is connected to the junction of two 47 ohm resistors on the top of the board as shown below:




    The POSITIVE lead is wrapped around the side of the board and connected to the 0V or 'earth' connection of the input sockets:

    I've just started using one of these, and have the low level hum. Any chance you can email me the pictures of how to connect each end of the 470uF cap? (tdr250 at gmail.com)?

    Thanks

  2. #72
    Join Date: Dec 2016

    Location: Willington, Beds, but France soon...

    Posts: 13
    I'm Paul.

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    Thanks for your help Alan

  3. #73
    Join Date: Oct 2017

    Location: Adelaide, Australia

    Posts: 5
    I'm Wayne.

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    Quote Originally Posted by Firebottle View Post
    I have had one of these for sometime and only getting around to use it now

    Would it be possible to have the pictures re-uploaded for myself and others?

    How much gain does the standard circuit provide?
    Thank you

  4. #74
    Join Date: Oct 2017

    Location: Adelaide, Australia

    Posts: 5
    I'm Wayne.

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    Is 1amp enough current for these? Will providing more current pose a problem?
    I have a few 12.6v Transformers to choose from.

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