polarity

  1. david winter

    Sansui 771: incorrect polarities for C17 / C18 on F-1504 preamp board and schematic ?

    Hi, I have been wondering what caused some low background noise on a 771 which I almost completely restored. Two electrolytics on the F-1504 preamp board (C17 and C18) apparently have incorrect polarities both on the schematic and the pcb silkscreen. They had -5V accross them. The 2SC1313 were...
  2. turnitup

    Crossover - Polarized vs Non polarized Caps

    I’m working on some 60’s University speakers and need to order some new crossover caps. Normally I replace all of the caps with poly caps, but this beast has a 200uf and 250uf cap in it and I’m not going to spend $300 to replace these with polys. Both of these caps are polarized, which I...
  3. turnitup

    LED Polarity

    Hi all, Hope that this an easy one. I bought a LED light panel that requires a 120 AC to 12V DC converter...no big deal, got one. The correct polarity is critical for LEDs, how do I determine which lead is the positive? I’ve got a meter, just don’t know what to test for. Stupid question, I...
  4. T

    Positive polarity wire on jbl 125a on l26 and l36

    Sorry if this is stupid but new to this. I have some jbl l36’s and trying to verify high wire from crossover is positive. I believe the male spade terminal On the l125 a is positive. the crossover feeds the l125a with a green wire and a black wire. Which one is the positive that goes to the...
  5. Zack Sainz

    KLH 14s (Slimline)

    Just got these bad boys in today! Wow am I impressed! I bought them on eBay and the seller said that one of the speakers didn’t sound “right” but played. The issue was that someone went in during a service and reversed the polarity of one “bass” driver. It took a few minutes to figure out...
  6. Bastian

    Yamaha M-45 - Help needed

    Hello Everyone. I am more of a DYI, hobbyist, but very much after the music rather than a proper technician. However, I have in the past effectively recapped couple old units for the sake of it, changed resistors to fix hiss, and never faced significant issues. Now, to the point. I have a...
  7. D

    KEF c55 white black jumper wires. Polarity?

    Ok this has got me stumped. White and black? No multimeter at hand. Anyone know ehich one is positive and negative to the woofer / tweeter?
  8. Cody AOC

    Can I reverse the polarity when in bridged mode?

    So I have a subwoofer that is dual voice coil and I want to reverse the polarity on my subwoofer because that's the way I like my subwoofers sounding and so my amplifier will put out more than enough power at bridged mode @ 4 ohms and I wanted to know how would I do this the reverse the polarity...
  9. onplane

    Test CD to hear inverted polarity

    Somewhere I read that there exists a CD designed to allow folks to test their amps for polarity inversion. Like "perfect pitch", I've read that there are people who can actually hear the difference between correct and inverted polarity audio signals. Now the reason for this that audio signals...
  10. fredb44118

    Recapping Marantz 2270... can I use non-polarized main filter caps?

    Hi everyone. One of the main power supply filter capacitors of my 2270 was leaking and causing sound issues, so I've decided to replace both of them. It's probably way overdue. So I ordered two Mundorf MLytic 10000uf/63VDC caps (http://www.partsconnexion.com/capacitor_ele_mundorf_plugin.html)...
  11. Moonwatcher

    Wharfedale W60 red dot

    Hi, and thanks in advance for any input. I have had a pair of two-way Wharfedale W60s for a few months and assumed the tiny, faded, almost invisible red dot on the left terminal (a small, nonstandard banana plug) indicated positive. But from looking at photos of what must be later models with...
Back
Top Bottom