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  1. KilgoreCemetery

    B&O Beogram 1900 bad motor?

    I recently picked up this turntable for cheap, but the motor won't spin. I opened it up and realized that someone had already been playing with the wiring a bit, and after looking at the wiring diagram, I wasn't sure it was even connected right. The wire colors don't match what it says on the...
  2. KilgoreCemetery

    Kenwood KR-865G Burnt Resistor

    I have a wire-wound resistor that is burnt beyond recognition and I'm hoping to find somebody that either has this exact model or has a service manual for this model so that I can figure out what value it's supposed to be. Unfortunately, It doesn't have a matching pair and the third band is just...
  3. KilgoreCemetery

    MN1455LF IC Info?

    I'm looking for any information I can find for an MN1455LF 40 pin IC. It's from a Marantz SR-8100 DC Receiver and I know that it probably has an internal clock of some kind, but otherwise, I can't find any info. The service manual is too big to upload, but I've included part of the schematic...
  4. 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...
  5. 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...
  6. KilgoreCemetery

    Sherwood AM-7040 No Left Channel

    I've been working on this integrated amplifier with no left channel and it's turning in to a real head-scratcher. I know that when I first got it that the left channel fuse was blown (250V, 7A, ceramic, Slo blow), so I checked the MOSFETs and found one of the P-Channel, 2SJ162's was burnt...
  7. KilgoreCemetery

    MCS 3847 Integrated Amp Noisy Left Channel

    I've been having trouble with this home audio amplifier that a friend gave me. It has constant noise on the left channel from the moment the main relay clicks on until I turn it back off. I recently replaced all of the electrolytic capacitors in the hopes that it would fix both this and a...
  8. KilgoreCemetery

    How do you test a 3-Legged Diode (Rectifier)?

    So, I ran across these diodes in a Kicker KX3004 amplifier. They're labeled D12 and D13 on the circuit board, otherwise I would've had them pegged as transistors. Anyways, how can I tell if they're any good? Does the AKA/KAK indicate how they operate, similar to transistor labeling? Any...
  9. KilgoreCemetery

    Do you still need thermal paste when using a silicone elastomer?

    I'm not sure if I'm asking in quite the right forum, but I recently ordered this thermal pad: https://www.digikey.com/products/en?keywords=1168-1209-nd. My question is, do I still need to use thermal paste? If it helps, I plan on using it behind the MOSFETs of a car amplifier.
  10. KilgoreCemetery

    Finding a replacement MOSFET

    I'm trying to fix a Sherwood AM-7040 Stereo Power Amplifier and found that one of the MOSFETs were shorted. It has J162 8L1 printed on it and the schematic says it's a 2SJ162. I believe Digikey has more info about it here...
  11. KilgoreCemetery

    Singing Machine Power Port Replacement

    I'm trying fix a Singing Machine SML385BTBK. The female power port on the back was pushed in and broken off and I was wondering if anybody knew how to identify it and where I can find a replacement one? Measuring the female side is a bit tricky, but the male end of the AC power adapter (Model...
  12. KilgoreCemetery

    Distorted Channel on a Rockford Fosgate Amplifier

    I recently picked up a Rockford Fosgate T8004 amplifier. I was told it didn't work and, after a little investigation under the hood as it were, I realized that a few of the MOSFETs and a couple resistors were bad. After replacing them, I powered up the amp and was happy to find that both of the...
  13. KilgoreCemetery

    Help identify a resistor without bands

    Could somebody please help me identify some specifics about this resistor? I know that it's 0.1 Ohms, but is it wirewound or metal oxide? Is it fire resistant or water proof? That sort of stuff. If it helps, it's pulled from a Rockford Fosgate T8004 amplifier and was located just in front of...
  14. KilgoreCemetery

    Sharp LCD TV Slow Refresh Rate

    I'm looking at this TV for a friend of mine. It's a Sharp LCD 42" TV LC-42SB45U and on about a third of the screen the colors take forever to fade. They just layer on top of each other. To make a long story short, I took off the back cover, powered on the TV and was able to correct the issue...
  15. KilgoreCemetery

    Optimus CD-7200 Missing Lens

    The title pretty much says it all. Someone gave me an Optimus CD-7200 Six-disc changer saying that it wouldn't read discs. I tried cleaning it with no luck and eventually took it apart for a visual inspection. Upon removing the pickup section, I realized that the lens was missing. I've checked...
  16. KilgoreCemetery

    Onkyo Integrated Amp With Incredibly Low Volume

    I have an Onkyo A-5 integrated home stereo amp that I was using up until about a week ago when the volume dropped to almost nothing. I feel I need to stress the "almost" part. With the volume knob maxed out you can hear music playing, but it's whisper quiet and seems to affect both channels...
  17. KilgoreCemetery

    Making bad audio better

    One question that has been plaguing me lately is what exactly makes an amp or receiver good? How much audio quality is gained or lost based on the overall design vs the components chosen? To put it another way, how much can you improve a poor amplifier just by swapping out components? Would you...
  18. KilgoreCemetery

    Is it possible to replace a single speaker with an aux port?

    Before I dive into this crazy project I want to know if I'm missing anything major. I have an old radio with a built in speaker that I want to continue to use. The catch is, the speaker is blown. Can I simply wire in an Aux cord and plug the unit into a different system?
  19. KilgoreCemetery

    Finding the right switch

    I'm trying to add a bluetooth module to an AM/FM radio in the least destructive manner possible and I feel like I have one last obstacle to overcome. I want to replace the existing rotary switch with one that you can also push in to activate another function. The original switch has a detent...
  20. KilgoreCemetery

    What readings to expect from a DMM's Cap setting

    I have a complete rookie question about this Digital Multimeter I just bought. It's a Southwire 10040N and it has a CAP function that reads in microfarads, nanofarads, etc. The confusing thing is, most of the time when I check capacitors I get wildly different readings than what is listed on the...
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