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  1. Radio Tech

    DIY M12864 Graphics Version Transistor Tester Kit LCR ESR PWM

    Good deal!. You have to remember where these came from, quality is an option. Test it against your dedicated tester and see how it stacks up. Looks good bro. This particular one yes. But you have to remember if there is another cap or a resistor in parallel, this tester or any other tester...
  2. Radio Tech

    #21 Powering up unknown old tube equipment safely

    Great! Glad you liked the video. Using the light bulb as a current limiter can save a lot of heart ache. And fuses and not to mention your life :) Thanks for subscribing. BTW Also, I appreciate you replying to the thread. I use the "like" feature and replies as a bench mark. When I see either...
  3. Radio Tech

    #21 Powering up unknown old tube equipment safely

    #21 Powering up unknown old tube equipment safely Last Video, Enjoy. In this video I show how I power up old equipment safely. Tube or solid state. You should NEVER plug something into a mains outlet if you do not know the condition of the equipment. Specially if it is vintage. Disclaimer...
  4. Radio Tech

    pics of upd2824 pll radio modified by STN

    I know the person that did the work to your radio. He/she is the best I know of.
  5. Radio Tech

    #20 Kenwood TM 621A deaf 220 MHZ Receive

    Really think it is more of a design issue than anything else. Have to remember there is not a lot of 220 gear out there. I think Kenwood was just chomping at the bit to get this radio on the market over looking critical designs flaws. One day when I can get a service manual I like to go in and...
  6. Radio Tech

    #20 Kenwood TM 621A deaf 220 MHZ Receive

    #20 Kenwood TM 621A deaf 220 MHZ Receive In this video I attempt to repair the 220 MHz receiver in a 621a. I have no service information on this rig but have repaired several of them. There are no free copies of the service manual online that I can find. I use the TM-721 block diagram to...
  7. Radio Tech

    #19 Circuit board trace repair

    Zzzz
  8. Radio Tech

    DIY M12864 Graphics Version Transistor Tester Kit LCR ESR PWM

    Naw you are up there too bro. I seen your videos :) Always nice to have etchant on hand, or a good bread board to test circuits with. Don't know why but I never got an alert that someone posted in this thread.
  9. Radio Tech

    #19 Circuit board trace repair

    #19 Circuit board trace repair In this video we look at repairing circuit boards that has had the traces lifted and broken off the board. Then we show how to repair a trace that has been blown due to a short circuit. I lost the final step showing prep to install the capacitor to the new pads...
  10. Radio Tech

    This is my setup of my repair bench

    Well thank you. Years of collecting lol. The shop is always in a state of remodeling. Has changed a bit since I posted this. I built a new 12 x 16 work room and did a complete remodel of the shop. A month ago I added a tour of the shop/shack on my YouTube channel. It has changed a bit since...
  11. Radio Tech

    #18 Kenwood TS 940 DOT on display Chasing down the rabbit hole Pt 1

    Yep, the 940 is plagued with a lot of the same issues as with a lot of Kenwood radios of this error. Connectors Solder joints Wax in PLL can ( wax is really not the problem, it soldering the pins while the wax creeps in the joints). Foam under PLL board becomes very conductive. AVR issue As you...
  12. Radio Tech

    #18 Kenwood TS 940 DOT on display Chasing down the rabbit hole Pt 1

    BTW, If anyone is tired of me posting these please let me know :)
  13. Radio Tech

    #18 Kenwood TS 940 DOT on display Chasing down the rabbit hole Pt 1

    #18 Kenwood TS 940 DOT on display Chasing down the rabbit hole Pt 1 In this video I have a TS-940 that has the dreaded dots on the display. After doing the regular checks for signals and voltages on the PLL's I decided to start looking for other issues that can cause this problem. So which is...
  14. Radio Tech

    #17 Mail Time

    And the IF board. I did get the tx/rx board installed. This restored all functions of the radio with exception of transmit and received. But now all commands work. Just a task of going in and check supply rails for what is and what is not working. But I feel it is something simple now. Perhaps...
  15. Radio Tech

    #17 Mail Time

    #17 Mail Time In this video I receive a nice package from one of my viewers. I know of only one part he is sending. What else is in the box? Lets find out.
  16. Radio Tech

    #16 Boat anchor on my door step "National NC-155 Receiver"

    Oh yes, it will go boom. I will not even turn it back on until I get it restored. Going to start by disassemble, clean, polish, and reassemble. Replacing old tired parts as I go. Then do a full alignment. I am going to re-stuff the old caps so they look original. Will wash the out side of the...
  17. Radio Tech

    #16 Boat anchor on my door step "National NC-155 Receiver"

    In this video I found a National NC-155 sitting on my door step. The receiver is very dirty and shows a lot of signs of many years of abuse. Will it still work with out a lot of repair? Lets find out. The National NC-155 is a ham-bands-only receiver covering the 80, 40, 20, 15, 10 and 6...
  18. Radio Tech

    #15 Kenwood TS-50 part 2 Display board repair

    That was done with a Dino-lite pro. Very handy little USB microscope. Not cheap but less than a Mantis.. http://www.microscope.com/dino-lite-pro-am4111t-1-3mp-digital-microscope.html?gclid=CjwKEAiAhPCyBRCtwMDS5tzT03gSJADZ8VjRboP305I-eFNjl0W36GPsNU9hzrTfHA5Aqs2WqgIDORoCi9zw_wcB