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  • DCJack
    B&K 707 tube tester. I need help.
    by DCJack
    Hi everyone!

    I managed to get my hands on a rough condition B&K 707 for "the best price" because it was not working. It's my first tube tester and I'm really wanting to get it up and running. I downloaded that manual that has the schematics and tested every resistor and capacitor and replaced the ones that failed. I replaced the missing 83 rectifier tube with a used but tested-good one. I also have a number 80 rectifier tube that I have used in tests before I found the 83 tube.

    Initially I noticed that I was not getting the red on-light to turn on, but it...
    03-05-2024, 05:05 PM
  • Schoenradt
    ECH81/6AJ8 Vacuum Tube Question
    by Schoenradt
    Recently I acquired an Eico HFT 92 AM/FM radio made back in 1958. The unit has had some decent modifications done such as replacing the rectifier tube with silicon diodes and replacing the main filter capacitor with electrolytic capacitors. When I powered it up FM wouldn't tune past 105Mhz. I checked the FM tuner front end assembly and found a capacitor not soldered to the coil from the Plate B+ to and ground on the other side of the coil. Some calibration was needed on the trimmer capacitor on the tuner. My question is AM is extremely weak. When I tap on the tube I get all kinds of snapping and...
    06-10-2021, 05:49 PM
  • Flaku_34
    Acer Nitro XV273 and Predator XB273, look inside and disassembly guide.
    by Flaku_34
    Introduction:
    Hello everyone, this topic is more of a knowledge sharing and look inside type of post, but for someone working on this model of display it might be useful. Recently I bought Acer Nitro XV273 XB MIIPRZX with busted electronic, but screen was intact, price was incredibly low, so I took a gamble and bought the unit and try to fix it. As I dug inside, I found out that my motherboard was not responding, although all voltages seemed fine. I wasn't able to find any reliable information about this monitor on the web (only some pictures of motherboards from Ebay). By some research...
    04-18-2024, 12:47 PM
  • bohaboha
    neon Tube power supply faulty T8006G V3.0
    by bohaboha
    Hi everyone needs your help with this Neon Tube power supply
    Here are some pictures
    Large capacitor has 320V but then nothing.has removed some parts but is not sure that they are bad except that they sounded bad on the circuit...
    04-22-2023, 05:05 AM
  • reessi
    20v / 2A SMPS for a Battery Charger - Explanation of Blown Resistors Please..
    by reessi
    Hello,

    My friend asked me to replace the wire going from this SMPS 20v adapter to the charger for a 18v Lithium Battery for a drill.

    The cable had frayed and been touching, as a result the 5 Paralleled R200 (0.2 ohm) resistors had blown O/C, they are connecting the main -ve rail to the output wire.

    The output was jumping around 13v and dis-appeared when a load like the charger was connected, they measured 900ohms.


    I experimented by replacing at first a single 0 ohm and then a 2.2ohm in and the output was restored at 21.62v and 21.65v respectively...
    08-22-2024, 08:12 AM
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