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Thread: Radford Revival activity blog

  1. #61
    Join Date: Apr 2012

    Location: South West of England

    Posts: 278
    I'm Will.

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    Kerr update


    Voltage boost transformer / rectifier board fitted and active smoothing boards wired up. The blank copper board on top is just being used as a physical barrier to protect the traces on the actual board underneath (and yes the copper is only single sided and the blank board can't flex ).




    Radford Revival
    www.radfordrevival.co.uk

  2. #62
    Join Date: Apr 2012

    Location: South West of England

    Posts: 278
    I'm Will.

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    Mk2 board.

    These are of slight interest - the circuit is almost like a mini Mullard 5-10 with the front end implemented with a transistor instead of an EF86. Purists might baulk but it actually works very well. The transistor is just in a simple common collector type circuit with emitter degeneration and a dominant pole in the collector. Feedback is applied to the emitter/"cathode" just like in a conventional Mullard style topology. The low collector voltage is then ideal for DC coupling to the ECC81 long-tailed pair which forms the phase splitter.

    Radford Revival
    www.radfordrevival.co.uk

  3. #63
    Join Date: Apr 2012

    Location: South West of England

    Posts: 278
    I'm Will.

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    Old vs new

    Radford Revival
    www.radfordrevival.co.uk

  4. #64
    Join Date: Apr 2009

    Location: Near Saffron Walden, Essex

    Posts: 6,628
    I'm Dave.

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    Is the brown one on the left the new one .

  5. #65
    Join Date: Apr 2012

    Location: South West of England

    Posts: 278
    I'm Will.

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    Quote Originally Posted by hifi_dave View Post
    Is the brown one on the left the new one .
    Obviously The old ones were far too neat for my liking! I upgraded them with boutique tag strips populated with the finest junk box components nearest the top of the pile.
    Radford Revival
    www.radfordrevival.co.uk

  6. #66
    Join Date: Apr 2009

    Location: Near Saffron Walden, Essex

    Posts: 6,628
    I'm Dave.

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    Point to point wiring at it's best..

  7. #67
    Join Date: Sep 2009

    Location: Derbyshire

    Posts: 8,598
    I'm Josie.

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    I always wanted to get my olde Woodside STA25 (Now with Andrew) re-done to point to point... Would that be something you could do?

  8. #68
    Join Date: Apr 2012

    Location: South West of England

    Posts: 278
    I'm Will.

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    Quote Originally Posted by The Black Adder View Post
    I always wanted to get my olde Woodside STA25 (Now with Andrew) re-done to point to point... Would that be something you could do?
    The Radford/Woodside circuits never really lent themselves to point to point wiring, not that it would be impossible, but I highly doubt the labour and time involved doing this would be worth it. In objective terms the amp would perform identically to as it did before (aside from minor differences in stray coupling, not necessarily for the better, either). At worst, if done improperly, you could end up with an unstable or noisy amplifier. At best you would end up with an amplifier largely indistinguishable from before. This is speaking from a purely "objectivist" point of view of course.
    Radford Revival
    www.radfordrevival.co.uk

  9. #69
    Join Date: Mar 2012

    Location: Gloucestershire

    Posts: 3,950
    I'm Paul.

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    Quote Originally Posted by Radford Revival View Post
    Old vs new

    Lovely work Will. Our mutual friend is going to be one happy bunny

  10. #70
    Join Date: Sep 2009

    Location: Derbyshire

    Posts: 8,598
    I'm Josie.

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    Who is this work for then?

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