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  1. J

    1969 VW Motorola Sapphire IX AM Radio Restoration 9SMV

    We continue from the first half if this series, having installed the new electrolytic capacitors to replace the single filter cap. A temporary and longer ground was added to the circuit board allowing for functioning outside the mount. My power supply is set up for 14v current limited, and a...
  2. J

    1969 VW Motorola Sapphire IX AM Radio Restoration 9SMV

    Today we will be starting the restoration of a 1969 Motorola Sapphire IX Am radio that I picked up from Jason from the Bug ranch. This is a 12 volt model for Types 1,2 and 3. A basic model which also has memory buttons. This is in terrible condition, though complete and appears to be unmolested...
  3. J

    Dynaco ST70 Abbreviated Restoration video

    Here is the non-technical artistic version of the ST-70 amplifier restoration video for all to enjoy edited from the several full length videos that made up the original restoration. I make several of such videos a year for larger projects.
  4. J

    Club Kasino Amplifier - Minor Repairs and Quick Tour

    This is a quick repair of a club Kasino Amp head. Its only has a minor issue, but I've never seen inside one so I've decided to make a video to document it, as well as the repair. Also a bit of Deoxit applied while the AMP was opened. I found it interesting That an Amp from 1973 would use IC's...
  5. J

    Ampeg Portaflex B-15-N Bass Amplifer - Major Repair

    I generally as a matter of policy return all removed components, even resistors in a bag, unless the component was hazardous.
  6. J

    Fender Twin Reverb - Random Feedback - Troubleshoot and Repair

    I have a unique situation here, given the line voltage as 'rather high' for this daily use unit, i told them all of the original tubes should come out. Until a bucking transformer is fabricated into a box for the mains to be plugged into, I biased it down on my bench. The voltages in...
  7. J

    Ampeg Portaflex B-15-N Bass Amplifer - Major Repair

    Glad to hear its coming together for you.
  8. J

    Ampeg Portaflex B-15-N Bass Amplifer - Major Repair

    Remember, mine arrived in shambles, so with all of the work done, any recommended upgrades could not be subjectively tested with everything going on at once. You may have the opportunity to try both with and without and see what suits you.
  9. J

    Ampeg Portaflex B-15-N Bass Amplifer - Major Repair

    Looks clean, yellow caps are fine, be sure to check the outside foil for ones near to ac lines and that side goes to lower impedance. Also check the high wattage resistors on this unit and replace as appropriate
  10. J

    Fender Twin Reverb - Random Feedback - Troubleshoot and Repair

    Here we have a twin reverb on the bench, and this is a strange one. The sound, which as described sounds like a feedback condition, did not happen when presented to me for inspection on-site. and while I think I know why, I still have to observe all safety procedures. Just in case the...
  11. J

    Carvin Pro Bass 200 Amp and Cabinet - Repair + Extreme Make-over

    This Amp was gifted to me from someone in the community as a non-working device in need of both electronic and cosmetic repair. We can hear in the initial test that the amp barely operates, albeit, it does. We will remove the amp from the cabinet and have a closer look. It would seem that...
  12. J

    Dynakit ST70 Complete restoration Project

    Having been requested upon restoration of my newly restored Dynaco Dynakit ST70 Amplifier, I've decided to test out the Amp by directly connecting the Commodore to it, and attenuating the signal instead of using a pre-amp. A visual output of the signal will further be my restored 1950's...
  13. J

    Dynakit ST70 Complete restoration Project

    Concluding our project in part five of the Dynakit ST70 restoration, I point out a terrible mistake I made that could have caused some serious damage. A short to ground from the rectifier through the audio transformers would have not been fun. Having corrected it, i'd decided it might be a...
  14. J

    Sunn Concert Bass Amp - Troubleshoot and Repair

    It's not often I work on transistorized amplifiers, however a couple of times a year I take on such a project. This Sunn concert, built around 1973 was owned by the same person since around that time and was looking for electronic repairs with no cosmetic work. I decided to take on the task...
  15. J

    Dynakit ST70 Complete restoration Project

    Now in part four of the Dynakit ST70 restoration project, I start off by demonstrating how dangerous of a condition i've left this unit in given the fact that nothing is connected to the electrolytic capacitor to drain it off to a load over time. Were talking about well over half an hour and...
  16. J

    The Sears Silvertone Twin Twelve 1484 Major Restoration Project

    As this was handed to me in that condition, I never took the time to see how many are still floating around, their condition and associated cost. It might be interesting to see, as i have no idea.
  17. J

    The Sears Silvertone Twin Twelve 1484 Major Restoration Project

    This is the compilation video of the six part restoration series of the Sears Silvertone Twin-Twelve model 1474. This is more of a non technical artistic condensed progression of this project which was. about 3.5 edited hours into about 14 minutes. Enjoy!
  18. J

    Dynakit ST70 Complete restoration Project

    Continuing with part 3 of the Dynakit ST70 restoration project, we will get right into the output transformers, though given the mass, and the nice shiny chassis, I cover everything first with masking tape in case of a mishap. All of the wires need be carefully negotiated through and the...
  19. J

    Dynakit ST70 Complete restoration Project

    Now in Part 2 of the Dynakit ST70 restoration project, we will begin with the choke as the first component for installation, though I thought it interesting to compare both on the Genrad 1650A impedance bridge to see that the impedance and inductance is. SPEC 62ohms 1.75h OLD CHOKE 63ohms...
  20. J

    Dynakit ST70 Complete restoration Project

    This is always the great debate. I already have one of those fully upgraded ST70's. This one, has been restored to specification, with two phase inverters in its original form. Me, I like it. Surely a movie in the series will include a demo.
  21. J

    Dynakit ST70 Complete restoration Project

    The rod and nuts are stainless steel, so they should be non-magnetic.
  22. J

    Dynakit ST70 Complete restoration Project

    This is the beginning of what is the second phase of a greater project going back several years, that being the initial salvaging of this amplifier after being found stored in a Florida attic for over 40 years. For this effort a complete video series exists where the amplifier was brought to a...
  23. J

    Fender Blues Deluxe - Troubleshooting and Repair Adventure

    While I generally do not work on re-pop's or Hybrids, I decided "Why not" so here goes.......... This is a Blues Deluxe, a modern amplifier that has tubes in it is the only way to describe it. This is not a pleasant device to work on. Given that the problem was described as a power...
  24. J

    Marshall JCM800 Lead Series Repair - Power Issues

    In part 2 we continue testing the caps that were pulled from the amplifier and come to find that while the capacitance was good (with the exception of one that exploded) what it does in term of leak-down and its quickly shown that these had an event that appears to be a condition caused by the...
  25. J

    Marshall JCM800 Lead Series Repair - Power Issues

    This JCM 800 landed on my bench had cutout issues as reported and was apparently blowing out fuses. This sounded strange, but since it was blowing out fuses, this is going to have to be put into service position and troubleshoot with the power-off. This will start with a visual inspection. The...
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