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

  1. #11
    Join Date: Jan 2017

    Location: Kansas City, Missouri

    Posts: 590
    I'm Nathan.

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    Quote Originally Posted by Barry View Post
    Is there any advantage in removing the 'blingy' blue LEDs?
    I think they're inside the valves.

  2. #12
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 3,641
    I'm Alan.

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    None whatsoever Barry, they are under each valve and not in the audio circuit.

    Looks less blingy now it's boxed up and only the top of the valves show

  3. #13
    Join Date: May 2015

    Location: Kent

    Posts: 85
    I'm john.

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    Thansk for posting the mods and schematics Alan. Is that silly led get-at-able with a sharpie? if it is i may well make like a rolling stone and paint it black.

  4. #14
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 28,441
    I'm Geoff.

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    Quote Originally Posted by Firebottle View Post
    Ali it sounds very neutral, I shall be trying it on the end of a lesser quality CDP later to see if it takes any of the digital glare away.
    Tell us how it sounds on your CD player Alan.

    Funny thing. I hadn't been following this, but coincidentally did have my eye on one on ebay. I'm tempted to get one and mod it as described. I have a nice power supply that suits.
    Last edited by walpurgis; 22-02-2017 at 11:53.
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC stepped attenuator or valve pre-amp or solid state pre-amp. Current dumping power-amp or either of two Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big dual concentric speakers/Smaller dual concentric speakers/Two way British compacts and full range speakers, amongst others. And too much more to list!

  5. #15
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 699
    I'm Andrew.

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    I've just looked at the ebay listing...
    HOW MUCH!!!!
    A couple of valve bases with p+p would cost more than that from a UK supplier! I'm gobsmacked.

    I was going to say that I didn't really see the point of this thread. That type of PCB construction is great for getting a circuit as compact as possible and it keeps production costs down for commercial products, but if you start modding the circuit or the board it loses those advantages and you might as well have hard-wired the circuit from scratch.
    However, having seen the price I can see the attraction. How can they make any profit on that?

  6. #16
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 36,430
    I'm Grant.

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    Thats what you get for making parts in huge bulk and a cheap labour force. Buying these things, even to strip for parts is a decent way to run a build business
    Regards,
    Grant ....

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  7. #17
    Join Date: Nov 2015

    Location: Wolverhampton

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    I'm Oliver.

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    Personally, I am very grateful they make them so cheap as it's gonna save me a lot of money to try something new. Alan knows his stuff so I'm very grateful I live so close to him too lol.

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  8. #18
    Join Date: May 2015

    Location: Kent

    Posts: 85
    I'm john.

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    "However, having seen the price I can see the attraction".

    That was it for me too, 15 ish with the power supply ive ordered? Why the heck not. I've never heard Valves at all in audio, only guitar amps, so it seems a great way to dip a toe in.

  9. #19
    Join Date: Jan 2017

    Location: Kansas City, Missouri

    Posts: 590
    I'm Nathan.

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    I just ordered the boards but I already have all of the components. I'm not sure if I have those particular transistors, but I'm sure I have some that will work. I've probably got a few weeks to find some if I don't before those things make it here from China.

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  10. #20
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 699
    I'm Andrew.

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    Those transistors haven't got much voltage across them and aren't carrying a lot of current so almost anything will do as an alternative.

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