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power supply

  1. Tubeglowpio

    How bad is this power supply ringing?

    So I'm wiring up this amp this weekend, finally had the time. I've never used a clcl filter before and know very little about ringing in a power supply, basically just know I want as little as possible. I ran an emulation in psud2 and believe I set it up right and these are some of the results...
    • Tubeglowpio
    • Thread
    • help power supply psud2 stereo tube tube amp
    • Replies: 104
    • Forum: Tube Audio
  2. Walter R

    HF-20 Power Supply Problem

    My two HF-20s that I just dusted off after 15 years operated great for 10 hours continuous. Then one of them went mute. Tube pin voltage checks (I have pin test adapters) indicated that there was no plate voltage to V1 and V2, both 12AX7s. The other tubes had plate voltage, but it was about...
  3. tubino

    Help to ID a commercial power supply (ham or other radio)

    I am hoping to find out what this goes to, in order to find it a good home, rather than pull apart for the iron. Uses a pair of 5R4s. Has output for transmitting, input from MIC and receiver. Any clues appreciated!
    • tubino
    • Thread
    • ham radio power supply tube power supply
    • Replies: 2
    • Forum: Tube Audio
  4. rmunson

    Simple power supply for DIY building breadboarding prototyping

    Hey Everyone - One project that I'm working on is a simple power supply to help me understand how AC power magically gets sliced in half and smoothed out like butter. Here's where my question for the group comes in -- In some simple PS designs I see a cap coming off the diode rectifier --...
    • rmunson
    • Thread
    • filter cap power supply rectifier
    • Replies: 8
    • Forum: DIY
  5. TellMeWhy

    Marantz 5220 Wow and Flutter?

    Hi all,I recently had my Marantz 5220 fully revised by a specialist tapedeck tech. I will copy a list of the work done below. However, after the revision there is still audible flutter, particularly when recording, and particularly on things like acoustic guitars and mandolins. In fact it's...
    • TellMeWhy
    • Thread
    • flutter marantz 5220 power supply recap recap power filter tape
    • Replies: 1
    • Forum: Tape
  6. thorpej

    Regulated B+ supply board

    Hey folks - I guess I'm easily distracted... I've been working on my own copy of the @kward bench power supply, and in the back of my mind is this EL84M amp based on Heathkit AA-100 iron that I've been nudging along ever so slowly. I've done a few design iterations of the power supply for the...
    • thorpej
    • Thread
    • lm317 maida mosfet power supply regulated
    • Replies: 5
    • Forum: Tube Audio
  7. M

    Sa 5200 low power output

    I have a couple sa 5200s, each with its own issues. The first one sounds good, audio is balanced, no crackle or hum, BUT audio output volume is about a third that of my other sa 5200. I thought amp circuit transistors, but both channels failing in exactly the same way?? How about power supply...
    • Mmj
    • Thread
    • capacitors low power low volume power supply sa5200 transistors
    • Replies: 1
    • Forum: Pioneer Audio
  8. audioman69

    MC 240 power supply

    Hello everyone. Trying to find out where are located C 21 & C22. Serial number 115D2 mid MC240. Anyone? Please help! ♻
  9. H

    McIntosh MC60 Power Amp Power Supply Question

    I have noticed that this amp has 80uF of capacitance right after the two 5U4 tubes. Wouldn't this amount of capacitance cause arcing of the rectifiers? Has anyone changed this when replacing the capacitors in this unit? Would it be better to reduce the input capacitance? I plan to replace the...
  10. cecilk

    Airline GAA-2940 - Power Supply 60 Hz Hum

    I'm repairing an Airline (Montgomery Wards) GAA-2940 console and after noticing the sound quality was a little off tone-wise and distorted, I have tested and replaced all electrolytic capacitors in the circuit (many were way off tolerance and quite leaky). The console now works fine - AM/FM...
    • cecilk
    • Thread
    • 60 cycle hum console stereo power supply
    • Replies: 35
    • Forum: Solid State
  11. Ray122

    Working on a SX-939

    Hey! So I'm working on a Pioneer SX939. Recapped the whole thing, but after I recapped the tuner section I got nothing. My first step when this kinda thing happens is to check and see if the section is getting power. It is, but only about 1.7v instead of the 13 I should be seeing. My next step...
    • Ray122
    • Thread
    • pioneer power supply repair repair help sx-939
    • Replies: 1
    • Forum: DIY
  12. HowlerMonkey

    Non Shi(i)t Power Supply for DAC & PHONO

    Can anybody recommend a 16V power supply that can power (2) different components? Is it a good idea? or are independent power supplies a better way to go? I like this PS but it can only handle 1 component from what I can tell: http://www.swagmanlab.com/Product_All?product_id=670 Background: I...
  13. B

    Onkyo M-510 Grand Integra Parts...

    Hello looking for the power supply board for my M510... please advise is you know of any place to buy this part (used i guess) it can be 100volt or 230volt thanks albert
  14. P

    H/K Signature 2.1 amp double stumper question

    OK... maybe I'm just foolish but I bought a European 220V H/K Signature 2.1 amp (5-channel x 100W) with a 220 /110 up/down converter. Question 1) How dumb am I thinking that I might be able to convert this beast to 110V and use it without the converter? Question 2) Added to the task is the...
    • psarahtonen
    • Thread
    • amplifier h/k harman harman kardon power supply signature 2.1 voltage conversion
    • Replies: 6
    • Forum: Solid State
  15. thorpej

    Heathkit PS-4 exhibits snarky behavior

    I picked up a Heathkit PS-4 (same circuit as IP-32) regulated power supply recently to serve as a secondary supply for the @kward Special I'm also putting together. It featured nearly-all original components (including Daystrom-branded GE 6L6GCs) and sort-of-worked; Voltage won't zero-out...
    • thorpej
    • Thread
    • 6l6 heathkit power supply regulated
    • Replies: 24
    • Forum: Tube Audio
  16. QSilver

    Reservoir capacitor upgrade...

    I'm going through an SX-838 I got recently in great condition. I've gone through it all and I'm planning on migrate some of the regulators to heatsinks as theres plenty of room in the case. I was wondering about changing the main filter capacitors for the power amp and I just so happen to have...
    • QSilver
    • Thread
    • capacitors pioneer power supply sa-9100 sx-838
    • Replies: 43
    • Forum: DIY
  17. B

    Upgrading Vintage Marantz 1030 Power Supply to Zener Transistor

    Hi, First time poster. I've started cleaning up and recapping a Marantz 1030 as a summer project. It's going well. However, one of the things I'd like to do - due to its relative ease - is upgrade the power supply to a better level of regulation. To do this I'm going to replace the resistor to...
    • benhodgson
    • Thread
    • calculate marantz modification modifications power power supply transistor upgrade upgrades improvements zener diode
    • Replies: 23
    • Forum: DIY
  18. N

    Technics SL-220 Power Issue

    Hi Guys, I'm new here so I don't know if this is the right place to post this, or if I'm breaking some rules, etc. Sorry in advance if I am. So, I have a Technics SL-220 that was working fine until I stupidly plugged the thing into two separate jacks on a power strip (I plugged it into the...
    • njm
    • Thread
    • power supply repair sl-220 technics
    • Replies: 4
    • Forum: Turntables
  19. thorpej

    Low-noise power supply without a choke

    Diversions from day-job work desperately needed, so... been playing with the power supply for the 6550 amp I'm contemplating. I'm concerned with using a choke in the power supply because of the inductance drop at full power. Even the 3H Hammond 193N is only rated at 500mA. I used this choke...
  20. thorpej

    How to select the correct AC line noise suppression caps?

    This isn't strictly a "tube audio" issue, but it's something I have been thinking about in that context... I'm interested in learning the correct way to calculate the appropriate value for AC line noise suppression caps, for filtering RF noise and random transients from the AC line before they...
    • thorpej
    • Thread
    • capacitor line noise power supply
    • Replies: 9
    • Forum: Tube Audio
  21. H

    Pioneer SA-9500 AC outlets

    Hi Everyone. I have just joined here. Have been the receiver of amazing information any time I had a problem or concern...so thanks. I have an SA-9500 which is running 240v as I am in Australia. I have just acquired an equaliser SG-9800 which is 120v. Can this be plugged into the AC OUTLETS...
  22. Ric Harris

    Sansui 4900Z Flickers and flutters and is dim when first turned on?

    Picked up 4900Z at goodwill last week for 20 bucks:banana: I walked into goodwill and from about 50 feet away I saw it and knew by it's look it was something good. I rushed over saw Sansui picked it up and walked right to the checkout giggling the whole way. When I first turn it on the...
  23. tusntuk2

    What's a good replacement for 2SB548 in a NAD 7140 power supply?

    Need to replace a 2SB548 (Q904) in a NAD 7140 power supply. I'm new to transistor matching (and AK!), as most of my experience has been with tubes. Any ideas? Thanks!
  24. R

    Sony STR-VX5 power supply trouble in paradise

    I was given a dead Sony STR-VX5 receiver, which I take to be a reasonable unit; thought I would fix it up and send it down the road to some deserving soul ... I'm not familiar with this unit at all, it has the "Legato linear circuit" and "pulse power supply" ... and, of course, I have no...
  25. QSilver

    Rectifier noise in outputs.

    I have an SA-5300 that I've been recapping etc. Just sat down to try it out and it quite honestly blew me away! Sounds really good. Very clear sharp sound stage and deep natural bass.... Only one small problem remains... when there is no sound, I can hear the "pulses" of the rectifier diodes...
    • QSilver
    • Thread
    • noise power supply rectifier sa-5300 solid state
    • Replies: 4
    • Forum: Pioneer Audio
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