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  1. KilgoreCemetery

    Testing Oddball MOSFETs

    @kellys_eye Wow. I normally avoid Chinese equipment, but I definitely didn't realize those things were quite that cheap or idiot-proof. @duke37 Thanks, I'll try that
  2. KilgoreCemetery

    Testing Oddball MOSFETs

    I really just want a second opinion on whether or not these are good. One is a P-Channel 2SJ162 and the other is an N-Channel 2SK1058. I'm using my DMM in Diode mode and the MOSFETs are out of circuit. The two things that are tripping me up the most are the built-in Zener diodes and the odd pin...
  3. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    Honestly, the nature of the noise has changed so much since I started this thread that I think a new (better) video is in order.
  4. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    As a continuation from post #43. Volume at zero, no noise, comparing voltage from one leg to the other of the same resistor: R228: 14.4mV R230: 14.4mV R227: 13.5mV R229: 13.8mV R223: 0.59mV R225: 0.60mV R224: 0.59mV R226: 0.60mV As for re-checking the same components WITH noise, the problem...
  5. KilgoreCemetery

    Vintage Schematic Questions

    The turntable looks almost exactly like the one in your picture. It's even about the same shade of green. I replaced the electrolytics with new ones when I added the diode and the C1 replacement caps all share a common ground just like before. I'm going to continue to use the tube, but was...
  6. KilgoreCemetery

    Vintage Schematic Questions

    That is a lot of interesting information. I could tell it was a very simple schematic, but I guess I didn't realize quite how simple. The good news is that I just finished building a better Current Limiter to test with so I'm far less apprehensive about powering it up with the tube in place...
  7. KilgoreCemetery

    Singing Machine Power Port Replacement

    The top comes off. I no longer have the unit, but I believe that there were four screws that held the top, black part on. It lifts up, then you have to disconnect some wires. Once inside, you should be able to remove some screws (and possibly more wires) to get the circuit board out where you...
  8. KilgoreCemetery

    Vintage Schematic Questions

    I'm rebuilding a mid-fifties Airline GAA-953B portable turntable and have a couple of questions about the schematic I found. 1. I've replaced the original Selenium Rectifier with a diode and I'm just now noticing that the plus and minus on either side of the diode symbol are backwards. Is there...
  9. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    Without noise, volume at zero, black probe on TR201 and red probe on TR202: B1: 1.4mV C1: -3.5mV E: 10mV C2: -3.5mV B2: 1.4mV Does this mean you want to know, say the difference in voltage between the southern leg of R211 and the southern leg of R212 or the difference between the southern and...
  10. KilgoreCemetery

    Any Linux (specifically Ubuntu) users here? HELP!

    Gryd3 raises a good point. Did you install Pale Moon through a package manager or manually. If you used a packager manager you could try: sudo dpkg -L palemoon It should give you an idea of where it's installed
  11. KilgoreCemetery

    Any Linux (specifically Ubuntu) users here? HELP!

    Then how are you able to confirm that it is still installed? I think I remember you mentioning a search of some kind. It's quite possible that it didn't just install itself for you, but for every user. Even if you're technically the only one, there's more than one place to put the binary. If we...
  12. KilgoreCemetery

    Any Linux (specifically Ubuntu) users here? HELP!

    Can you view or change the owner of it? Root is a lot different now than it used to be. Sudo doesn't give you the unlimited power that it once did.
  13. KilgoreCemetery

    Any Linux (specifically Ubuntu) users here? HELP!

    Are you getting any error messages during the uninstall? Try updating your system first, then remove it from the repository list just to make sure it's not reinstalling it automatically.
  14. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    I'm getting 2.375V. As the noise increases, the voltage drops. The voltage also seems to drop more and more over time. I see what you mean about the residue around TR201. I removed it and did some cleaning before re-soldering it. The noise is still there though. To me, the most interesting...
  15. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    Sorry for the delay with the replies. The holiday season has really upturned my normal schedule. Hopefully, I can get back on track very soon. We have a result! No noise on R201, but there was an avalanche of noise on the output. I re-soldered C203 for the next tests. TR303 is, in fact, a...
  16. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    I'm assuming that you want to know the voltage drop between the two bases. TR210 and TR212 Without the noise: 2.41V TR209 and TR211 Without the noise: 2.398V If you're wanting the actual voltage. TR210 and TR209 are around 1.2V TR211 and TR212 are around -1.2V The noise has become more of a...
  17. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    oops, I forgot to upload the picture of C125/C126, but here it is now. If it helps, it's sandwiched between the board we've been looking at and the front panel. Dorke: I have been keeping the volume knob at zero at all times. Also, here are the updated voltages for TR201 and TR202: TR202 B2...
  18. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    I've now tried 47uF caps in both spots and got the noise, then 220uF caps in both spots and still have the noise.
  19. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    It has occurred to me that maybe I simply didn't fix the problem by replacing the electrolytics because I followed in someone else's footsteps. I didn't have a schematic (still don't), but there was one oddity during the recap process. C126 and C125 had different values on a board that is...
  20. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    I've cleaned up the Mono/Stereo pot and sprayed deoxit on the volume and loudness controls again since it seems like the noise returns while messing with the controls on that daughter board. I even went so far as to reflow all the solder joints on it just in case there was a bad one that I...
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