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power supply

  1. M

    Jadis JP80MC info needed

    Hello friends. So I made my Defy 7 work, and it sounds great. But now my vintage JP80MC has developed noise in the left channel only of its MC stage. It’s “motor-boating”, which to me indicates either a bad capacitor, or a bad regulator. On my unit regulator markings are sanded off. On later...
    • marknoir
    • Thread
    • jadis mc motorboating oscillation phono stage power supply preamplifier regulator
    • Replies: 0
    • Forum: Tube Audio
  2. Zack Sainz

    FX-AUDIO- TUBE-01J

    Hello all! I am curious if anyone has experience with this buffer/preamp? Specifically the Japanese edition with the gain switch? From what I have read, the tubes should be swapped for the GE JAN 5654W. And since this is the Japanese edition, what kind of power supply should be used in the...
    • Zack Sainz
    • Thread
    • fx audio tube-01 power supply preamp tubes
    • Replies: 9
    • Forum: Tube Audio
  3. M

    Need help on Jadis JP80MC

    Looking for Jadis JP80NC schematic diagrams or even for a picture of power supply view with bottom cover removed. Need clear pictures to see values and components. Was sold a unit with a totally burnt power supply components. Surprisingly, unit is working somehow. Seller refused to take it back...
    • marknoir
    • Thread
    • burnt jadic jp80 jp80mc power supply
    • Replies: 0
    • Forum: Tube Audio
  4. O

    AU-717 Power supply board re-capped, now no V from tranformers

    Hi all, I hope someone can assist with some trouble shooting suggestions. I have been working through my AU-717, which was not working when I received it. I renewed the majority of capacitors on the Power supply & protector circuit board (F-2663) per some other information on this forum. I...
  5. AlexHempel

    Help With Mark Levinson ML-1 Power Supply

    Greetings AK, I'm currently attempting to fix a Mark Levinson ML-1 preamp that has a serious power supply problem. The ML-1 was given to me by a friend who refuses to bring it to a real tech (I already suggested that multiple times), so I'm attempting repairs. It came with the main preamp unit...
  6. NicholasD

    UPS Power Supply Not working off Batteries, 240V mains OK.

    Nikko / Powercom 1500VA 900W Line-Interactive UPS MODEL: BNT-1500AP I have / had this UPS in my Studio and every night at around 11pm it would switch over to generator power, thus engaging the UPS batteries briefly while it switched over. Now my computer goes off as the UPS does not seem to...
    • NicholasD
    • Thread
    • batteries battery diagnosis no power power supply powercom repair ups
    • Replies: 1
    • Forum: Solid State
  7. USMC Spike

    Thorens TD 147 x2

    So, not to hijack Plattensp thread on the subject, I thought it might be beneficial no only to him but also others why make be thinking along these same lines. In fact, if you read what Plattensp say's in my quote from him, it sounds just like my story also. Except I found a high end TD 147 and...
    • USMC Spike
    • Thread
    • adjustment cables capacitor cartridge jacks mm or mc motor operation power supply thorens 147
    • Replies: 11
    • Forum: Turntables
  8. P

    Some questions for the power supply on a SX-750

    I got an untouched SX750 a few days ago and started already to work on the different boards. Before disassembling I took the AC and DC voltages at the Power Supply Assy AWR-099 and AWR-100. Pin 12 and 16 should be +/-48 vdc but pin 12 hat +53.9 vdc and pin 16 -55.5 vdc. The only thing I changed...
    • pa_200
    • Thread
    • awr-099 awr-100 bias dc offest power supply sx-750
    • Replies: 13
    • Forum: Pioneer Audio
  9. D

    Klipsch RW 12d 120V Sub Power Problems

    Hey, I recently acquired this used sub, and have had problems getting power. Changed out the cord and fuse, and it did not help. Took off the panel and was hoping it was a wire problem and was dumbfounded/horrified at what I found. Besides the obvious, there was what looked liked super glues...
  10. Johnny_Law

    Sony STR-7065 Power Supply Rectifier Caps H-O-T

    Heat in the STR-7065 PS appears to be a feature rather than a bug (i.e., a design error), see e.g. thread 1 and thread 2. The first reference thread mentions a hot R802; the second thread mentions the same but also that C801-C804 were replaced in a previous with 0.033uf / 600V caps...
  11. S

    Pioneer sx-7 blows main fuse

    Just found a pioneer sx-7 at my school (we used to do electronics repair). Put a new main fuse in it... it lasted about 500 ms. Any common problems with this? Main transformer ohms out at 2.5 ohms- should be fine. Someone was talking about a Darlington Pair, but I don't think it was this amp.
    • Slader
    • Thread
    • main fuse pioneer sx-7 power supply
    • Replies: 3
    • Forum: Pioneer Audio
  12. samosui

    CS 721 starts smoking after SAS install on V15 IIIDU .... ?

    No connection between replacing the existing stylus with a VN35HE and then smelling burning electronics but give me a break! Three minutes into listening to an album and I start smelling something. Then a minute later, smoke is coming out. The capacitor in the lower center of this photo...
  13. S

    Stereotech 1200 - Hum in both channels

    I have a Stereotech 1200. Over the winter it developed a hum on both the left and right channels. Hum is present: with no sources connected on multiple outlets and house electrical circuits on multiple sets of speakers and wires regardless of 2 prong plug orientation (again tested on...
    • special_20
    • Thread
    • hum power supply recap stereotech stereotech 1200 trouble shooting
    • Replies: 15
    • Forum: Solid State
  14. Johnny_Law

    NAD 216: In Protection w/ Power Supply Issues

    Edit 1/4/20: Power Supply solved. Right amp issues now. Jump to https://audiokarma.org/forums/index.php?threads/nad-216-in-protection-w-power-supply-issues.871337/page-6#post-13374657. Research done thus far: https://www.diyaudio.com/forums/solid-state/330113-nad-216-help.html...
  15. Richs_Trains

    Marantz 1150 - Need Help - Intermittent Fail - Heavy Static

    Hey AK, I bought a basket case 1150 about 2 years ago and managed to find the pieces that were missing and replaced the broken shaft. I was able to get it going and adjust the amps and then I started using it as my “outdoor” system. It played fine for a week or two and all of a sudden, heavy...
  16. G

    850 woes following PS rebuild: some voltages off, then fuse blew!

    Hello Everyone, after completing my SA-7100 last month, I started repairing a beat up sx-850 that I'd had in storage for awhile. After replacing some horrific wire splices from Aux and Phonos to selector board...
  17. P

    Pioneer SX 828 Power supply help and ideas needed!

    Hello friends of the good old Pioneer receivers, I’m writing you from Germany and hope for some help and ideas for my rebuild of my first SX-828. Actually I have cleaned the interior and want to start with the work on the power supply board, followed by the protection and the head amp unit...
    • pa_200
    • Thread
    • att-059 awr-010 power supply sx 828
    • Replies: 31
    • Forum: Pioneer Audio
  18. oldman55

    Bell Pacemaker 2221b recap

    Not much to do on this unit as most caps are ceramic and don't believe they ever go bad. The first cap on the PS is a 40uf off of a 6CA4 rectifier. I don't know the limits on the tube and was going to put a 47uf in the old paper cap along with a 22uf (spec 20uf). Rectifier has 360vac and...
    • oldman55
    • Thread
    • 6ca4 rectifier bell pacemaker 2221 pacemaker 2221b power supply
    • Replies: 16
    • Forum: Tube Audio
  19. nickdinatale

    Looking to build a dual C8 power supply

    Hey there, McIntosh Audiokarma. I've had a single C8 in my possession for quite a while now and had been waiting on getting a second one in order to do some sort of stereo preamp setup. I recently ended up with a C8s, so now I'm ready to move forward with my plan. I have a pair of MC30's that I...
  20. Andrew Heck

    Laptop Charger As Power Source

    I realize that all wall worts are not made the same, so is a laptop charger a good, quiet, low interference source of DC power? If so, I’ve wondered now for a while, what of ground in a DC circuit that’s not rectified from AC such as a battery powered head amp for MC phono signal boost? And how...
    • Andrew Heck
    • Thread
    • ground connection power supply wall wort
    • Replies: 14
    • Forum: DIY
  21. Ray122

    Power Supply Design Help

    Hey All! So I just bought this transformer on eBay A) because I thought it was an okay price, and B) because it was a 300VA 24V - 24V power transformer. What I got was a lot beefier then what I've work with in the past. I'm more use to a center tapped transformer. I've attached the...
    • Ray122
    • Thread
    • design diy electronic power supply power supply assembly
    • Replies: 6
    • Forum: DIY
  22. K

    Pioneer PL-61 Turntable, Power supply drawing

    I have a PL-61, and want to change voltage from 100 to 220. Unfortunately, it has no voltage changer in outer case. Does, Any body have drawings for power supply ? On the power transformer, it written as o, 100V, 110V, 130V, 220V, 240V. And connected 0 & 100V (You can see the photo)
  23. thorpej

    Pre-amp power supply needs a sanity check please!

    So, I'm about to dive into building a low-gain 6AS7 / 6080-based stereo pre-amp, and was talking to a buddy about it and he expressed interest in it, but he wants tone controls and a phono stage. "Ok, sure!", I said. I need ~160V for the 6AS7 gain/output stage (that will be loaded with a CCS)...
    • thorpej
    • Thread
    • 6080 6as7g power supply pre-amp
    • Replies: 16
    • Forum: Tube Audio
  24. T

    Lafayette LR400 Tube Receiver

    I just received a non working Lafayette LR400 receiver. Years ago, someone changed the capacitors to different values, mis-wired the unit and one cap is blown up. Could someone take clear photos of the wiring of their LR400 showing the power supply wiring and share? I do have the owner's manual...
  25. davstev

    Kenwood 700M - replace filter caps?

    Hi, I recapped a 700M a few years ago. I left the original power supply filter caps in- the big ones. I've sometimes wondered if I should spend the money to replace them, and just to complete the job. Looking at $100 minimum, probably. If the current ones seem to work fine, though they're...
    • davstev
    • Thread
    • 700m capacitors filter caps kenwood power supply recap
    • Replies: 31
    • Forum: Solid State
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