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power supply

  1. Aaron99

    Marantz 2238 won't power on.

    New to the forum. I just acquired a Marantz 2238 in decent cosmetic shape from a seller on CL. The seller told me that when he presses power button a few seconds later he hears a click and then nothing. The unit passed a DBT and then I plugged it in and powered on. Within 2 or 3 seconds...
    • Aaron99
    • Thread
    • 2238 marantz p800 power supply zener diode
    • Replies: 70
    • Forum: Marantz Audio
  2. ChefE

    Is this normal: Sansui 8900ZDB power supply

    I recently acquired this Sansui 8900ZDB. It works 100%. But while cleaning the inside, I noticed the power supply looks a bit disheveled. Is this normal?
  3. Richs_Trains

    Marantz 4230 Oscillation

    Hey guys, Latest project is a 4230 I actually bought for the decoder and the wood case, so the receiver cost me about $100.00. I was billed as LED upgrade, De-Oxit and functional. What I get is functional until you start to turn it up, then the power oscillates (sound up and down, lights up...
  4. Richs_Trains

    Marantz 3200 Pre-Amp

    So, I ran out of open units to recap and I figured I do one of the pre-amps. I opened up a 3200 only to find that someone had already re-capped this unit, yea and boo. Good that it is done, bad means I have to find something else to play with. I do have a question. ...this unit has a 220uf...
  5. Johnny JJ

    Marantz 2285b power supply P800 capacitor value?

    Hi, I'm a newbie to this site so please bare with me. I am rebuilding my marantz 2285B starting with the power supply (P800). The question I have is capacitor C804 is shown as 10uf/50v in the schematic however what is installed on the board is a 47uf/50v. Can anyone confirm what should be in...
  6. RiotClass

    Marantz PM325 Amp Repair Please Help

    Hello, I recently got my father in laws old Marantz turntable and amp so I could have a go at some vinyl . When I tested the amp the lights were on (see pic) but no sound coming from the speakers and no movement in the power leds no mater what I did with the volume knob. I know enough about...
    • RiotClass
    • Thread
    • maratz pm325 power supply power supply voltage repair
    • Replies: 0
    • Forum: Marantz Audio
  7. lini

    Question to other PCM-M10 owners

    First of all, let me mention that I didn't know where else to post that question, as neither "Digital Sources" nor "Tape" seemed to fit - so I deemed "General Audio" most appropriate... Anyway, I regularly connect my PCM-M10s to the included wall-wart power supply every one to three months for...
  8. QSilver

    Better Heatsinking?

    I picked up an SX-V80 this week having clocked the magic words "Non-Switching-Amplifier" on the front. After a lot of dusting, its working pretty well apart from a bit of a DC offset drift on the left channel and some slightly jumpy trimmers that will soon be replaced.... the amp looks to be a...
    • QSilver
    • Thread
    • power supply sx-3900 sx-d5000 sx-d7000 sx-v80
    • Replies: 5
    • Forum: Pioneer Audio
  9. tcdriver

    Heathkit Preamplifier Model WA-P2 Power Supply – What are you using?

    A Power Supply for the Heathkit Preamplifier Model WA-P2 The Heathkit WA-P2 is a monophonic vacuum tube preamplifier that was sold in kit form between early 1954 to late 1959. It was designed to complement the Heathkit power amplifiers of that time. The well written manual contains the...
    • tcdriver
    • Thread
    • heathkit wa-p2 power supply wa-p2
    • Replies: 82
    • Forum: Tube Audio
  10. thorpej

    Selecting a NTC thermistor inrush limiter

    Sorry folks, not strictly a tube audio issue, but my assumption is that folks here have some experience with it. The amp design I'm working on will have a B+ current draw of approximately 450mA (that's rounded up) at full power. At idle it's going to be around 240mA (again, rounded up). B+...
    • thorpej
    • Thread
    • inrush limiter power supply thermistor
    • Replies: 44
    • Forum: Tube Audio
  11. JKent

    HK T25 hums

    I helped a friend get a Harman-Kardon T25 TT and he's enjoying it but he said he gets a slight hum during quiet passages. The TT is grounded to his receiver (an old Pio, I think). I suppose it could be elsewhere in the chain (receiver for example) but any ideas about the TT? I know there is a...
    • JKent
    • Thread
    • capacitor hum power supply
    • Replies: 0
    • Forum: Turntables
  12. TellMeWhy

    Marantz 2230 Transformer Buzz

    Hi all. So my 2230 has developed a mechanical buzz from the transformer, loud enough to be heard at very near distances and quiet listening volumes. No noise is present in the audio. Am I right in thinking that it's likely to be loose through bolts in the transformer itself? Should I remove the...
  13. crkeith65

    8080DB F2624 driver board frustration

    Let me set this post up right to begin with. I have owned this 8080DB since new. After letting it sit idle for many years because of driver board failure, I took it out to reclaim it's glory. The driver board was completely gone through along with re-capping the power supply board and 4 new...
  14. c.coyle

    Troubleshooting hum

    Capacitor coupled receiver. Nothing connected to it except two speakers. Hum on all inputs, both channels, regardless of volume [EDIT: Meaning the hum level is not volume dependent]. Flipping the plug makes no difference. Plugging into another outlet on a different circuit makes no...
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