+ Reply to Thread
Page 2 of 8 FirstFirst 1234 ... LastLast
Results 11 to 20 of 74

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

  1. #11
    Join Date: Jan 2017

    Location: Kansas City, Missouri

    Posts: 590
    I'm Nathan.

    Default

    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: 4,123
    I'm Alan.

    Default

    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.

    Default

    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: 34,536
    I'm Geoff.

    Default

    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.

  5. #15
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,142
    I'm Andrew.

    Default

    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: 44,028
    I'm Grant.

    Default

    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 ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    OPPO BDP-103D DARBEE - JBE SERIES 3/M55E/EMOTIVA XPS1 - TWIN PRO MONOBLOCK AMPLIFIERS - XIANG SHENG DAC\PRE\HEADPHONE AMP - TWIN AVANTREE OASIS CLASS 1 BLUETOOTHS - AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER24, DEEZER HiFi - SMSL M6 MINIDAC - RPI/AUDIOPHONICS - FULL RANGE TWIN TELEFUNKEN/Q ACOUSTIC BT3/CANTON SUB - P.INSPIRED MAINS REGENERATED.

  7. #17
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 5,221
    I'm Oliver.

    Default

    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.

    Sent from my EVA-L09 using Tapatalk
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 tonearm > Ortofon Kontrapunkt b > Wizard Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Firebottle modded Xiang Sheng DAC (Telefunken Valve)
    Amplification: Slagle AVC Passive Preamp & Firebottle Monoblocks (Telefunken Valves)
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables Throughout
    Speakers: Pioneer CS-77A

  8. #18
    Join Date: May 2015

    Location: Kent

    Posts: 85
    I'm john.

    Default

    "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.

    Default

    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.

    Sent from my Z981 using Tapatalk

  10. #20
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,142
    I'm Andrew.

    Default

    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.

+ Reply to Thread
Page 2 of 8 FirstFirst 1234 ... LastLast



 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •