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Thread: Radford STA15 Tweak

  1. #1
    Join Date: Mar 2016

    Location: New Forest

    Posts: 25
    I'm Clive.

    Default Radford STA15 Tweak

    This may be a well known tweak for any amp but I am so impressed with the result I thought it worth sharing.
    Because my pre-amp has no balance control and a very high output I wanted to have an input volume pot fitted to each channel of my Radford STA15. I decided I could live with the output impedance being fixed at 8 ohms and therefore could remove the selector switches and install the pots in their place. David Coe at AD Audio carefully selected a pair of pots and did the work.
    Having got it back, I am amazed that a change carried out for the sake of convenience and usability has produced such a dramatic improvement in sound quality. Whilst it was no mean performer before, there is now an improved clarity across the range with particular improvement in the bass. It doesn't go any deeper, but what there is seems stronger and more focussed.
    Of course should I need to, the output impedance can still be changed but not just by turning a knob.
    Be interested in knowing if anybody else has tried this.

  2. #2
    Join Date: Oct 2016

    Location: London

    Posts: 108
    I'm David.

    Default

    Hi Clive, all,
    There's at least one other Radford out there with this tweak as I serviced one a couple of months ago. What I never had the chance to was the before after comparison. I expected an improvement from removing a fifty year old switch with corroded contacts but not the level we got. I was more than surprised with the increased bass when I put on Fire Straits after the amp was fully warm!

    Sent from my ONEPLUS A5000 using Tapatalk

  3. #3
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,577
    I'm Alan.

    Default

    Quote Originally Posted by AD Audio View Post
    .. Fire Straits ...
    Hope that wasn't because the amp was too warm

    Good one.

  4. #4
    Join Date: Oct 2016

    Location: London

    Posts: 108
    I'm David.

    Default

    There's nothing like Fire Straits on a cold winter's day!

    Sent from my ONEPLUS A5000 using Tapatalk

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