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phase inverter

  1. B

    Caution on using 6GH8, 7687, 6U8 tubes to replace 7199 or 6AN8 in phase splitter circuits

    The pin out for the 6GH8, 7687, 6U8 tubes has a design weakness when used in a phase splitter circuit that can cause high frequency stability issues with some amplifiers originally designed for the 7199 or 6AN8 tube. The 6GH8, 7687, 6U8 tubes all feature the pentode grid (pin 2) right beside the...
    • Bob@Blue5
    • Thread
    • 6an8 6gh8 6u8 7199 7687 high frequency stability phase inverter phase splitter
    • Replies: 39
    • Forum: Tube Audio
  2. MadPik

    X-101-C Phase Inverter Adjustment

    Howdy All, As some of you may recall I refurbished an X-101-C a few years ago and you all were a tremendous help. The amp has been up and running for a couple years now and sees a lot of use. However, when first troubleshooting the amp a curious "helper" adjusted the Phase Inverter pots before...
    • MadPik
    • Thread
    • phase adjustment phase inverter x-101-c
    • Replies: 0
    • Forum: Fisher
  3. daylite

    Fisher 500C restoration and modification project

    PCBs: IBBA......EFB......Buffer......Phase Inverter TAPE MON to AUX input......Tone Control Bypass TAPE HEAD input to AUX input 500C selector switch function animation Loudness contour modeling and component selection This project is close to an end. A signal strength meter problem came up but...
    • daylite
    • Thread
    • bypass efb ibba loudness circuit phase inverter selector switch tape monitor tone control
    • Replies: 108
    • Forum: Fisher
  4. thorpej

    6A6 as phase inverter?

    I recently came across a couple of opportunities that, given the sap that I am, I couldn't refuse. One of these was a bunch of NOS 6A6s in shop-worn boxes. 6A6s are electrically equivalent to 6N7, just in the older ST bottle and UX7 base. Originally intended to be class-B power tubes, they...
    • thorpej
    • Thread
    • 6a6 6n7 ltp phase inverter
    • Replies: 9
    • Forum: Tube Audio
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