zebulon1's Recent Activity

  1. zebulon1 replied to the thread SX-1010 no sound AWH-032 problem.

    Can you center the amps, DC Balance them? At least checked them? It looks like they are railed to the plus side. Some how you have...

    Nov 20, 2017 at 10:04 AM
  2. zebulon1 replied to the thread STK-0050 replacement for SX-780 and others.

    Get cracking on a big version :whip:

    Nov 20, 2017 at 9:42 AM
  3. zebulon1 replied to the thread Marantz 250 DC Balance question.

    I think I figured it out: The 100v is two halves (in parallel), of the two primary's. And the 220v, is a winding and a half of both...

    Nov 19, 2017 at 10:01 PM
  4. zebulon1 attached a file to the thread Marantz 250 DC Balance question.

    I wired it for the 100 volt but ended up with +-70 volts at the filters. So I'm going to put it back. When it was wired as seen in the...

    110v conversion marantz 250.PNG 220 volt conversion marantz 250.PNG DSC04398.JPG Nov 19, 2017 at 6:22 PM
  5. zebulon1 replied to the thread SX-1980 left channel dead..

    :thumbsup:

    Nov 19, 2017 at 6:03 PM
  6. zebulon1 replied to the thread STK-0050 replacement for SX-780 and others.

    I wanted to inform the thread that I (we) just sold the 40th kit from the auction listing. Most of guys will buy two sets/kits. Several...

    Nov 19, 2017 at 5:51 PM
  7. zebulon1 attached a file to the thread Marantz 250 DC Balance question.

    I just noticed it's wired for the 200v AC line voltage. After looking at the Google images, most are wired for the 200 volt. Not sure...

    DSC04397.JPG Nov 19, 2017 at 11:57 AM
  8. zebulon1 replied to the thread Pioneer SX1000TW Questions.

    It could be something more sinister. Like a weak amp. The headphones use minimal current. The speakers require larger amounts. Some...

    Nov 19, 2017 at 11:17 AM
  9. zebulon1 replied to the thread SX-1250 Filter caps.

    The proper filters run $28.00 apiece. The work to replace them is minimal. A couple of hours at best. Why would the seller, who seems...

    Nov 19, 2017 at 9:10 AM
  10. zebulon1 replied to the thread SX 980 Phono not too loud (enough).

    The cartridge will have an effect. If its MC (Moving Coil) it will be diminished in signal compared to the MM (Moving Magnet).

    Nov 18, 2017 at 8:38 PM
  11. zebulon1 attached a file to the thread Marantz 250 DC Balance question.

    I got it finally. Reinstalled the original diff pair, only I put them in opposite of the original configuration. Replaced the other two...

    DSC04396.JPG Nov 18, 2017 at 8:27 PM
  12. zebulon1 replied to the thread Marantz 250 DC Balance question.

    Nothing wrong with this board except the diff pair. Putting the original pair in makes the offset closer to zero (-0.150v's) I need a...

    Nov 18, 2017 at 7:28 PM
  13. zebulon1 replied to the thread Marantz 250 DC Balance question.

    I replaced both C503 and C507, replaced the diff pair with a matched set of 2N5961's. No help. -.500v's DC Balance with the trimmer full...

    Nov 18, 2017 at 3:45 PM
  14. zebulon1 replied to the thread Marantz 250 DC Balance question.

    I'll check the caps in the morning. The left amp is perfect. Zero and stable

    Nov 17, 2017 at 9:34 PM
  15. zebulon1 replied to the thread Marantz 250 DC Balance question.

    Just checked CR501 and CR502 and I have a good 17v's on both.

    Nov 17, 2017 at 8:11 PM