• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

voltage

  1. C

    Sansui Solid State Amplifiers and Low Freq. Oscillation

    Hey all, I have a weird issue that's come up twice now, both Sansui solid state receivers, both the same kind of issue, low frequency oscillation. First - I have a Solid State 3500. The outputs are original - as are all pre-drivers/tx on both amp boards. Bias adjusts fine on both channels...
    • CaseyWKC
    • Thread
    • bias low frequency oscillation power supply sansui solid state stability stv swing voltage
    • Replies: 7
    • Forum: Exclusively Sansui
  2. T

    Switching Marantz 1040 from 220V to 110V

    Hi - Longtime reader here, finally registered. I recently bought a Marantz 1040 that was totally recapped and even has a (only slightly janky) custom-built wood case. But it's wired for 220v and I'm in the U.S. I see in the manual that it's a very simple process to rewire the voltage to 110...
  3. C

    Pioneer SX-780 Voltage Regulator Trouble

    Hey all, I have an SX-780 that refuses to come out of protect. PA3001 isn't getting the 13.5 volts it needs to come out of protect, but there are more issues. Q25 - 2SD712 7.6v on emitter 7.2v on base 8v on collector Q13 - 2SD325R 25v on emitter 28v on base 25v on emitter C316 has the...
    • CaseyWKC
    • Thread
    • 2sd712 pioneer protection protection board regulators sx 780 voltage
    • Replies: 62
    • Forum: Pioneer Audio
  4. ZeRask

    Yamaha A-1 high voltages

    Hello, AK’ers I hope some Yamaha A-1 experts here can help me troubleshoot a weird voltage issue with my receiver. I attempted a recap/servicing on my A-1, which went well until the Electrolytics board, which was supposed to be the last one. I studied everything related to the subject on AK...
    • ZeRask
    • Thread
    • dc offset idle current recap and restoration voltage yamaha a-1
    • Replies: 65
    • Forum: Yamaha
  5. SAEAl

    Help Needed With A Rotel RTC-970 Preamp

    I have a Rotel RTC-970 Tuner Preamplifier that has several issues that all seem to be related. The obvious operational issue manifests itself as the volume control turning itself down after the unit is on for about 20 minutes. At that point, to turn the unit off, you have to unplug the unit as...
    • SAEAl
    • Thread
    • hot jp4 jp5 preamp regulator rotel u26 voltage
    • Replies: 0
    • Forum: Solid State
  6. M

    Onkyo CP 1050 turntable voltage question

    Hi all. I have an Onkyo CP 1050 turntable purchased six years ago in Japan. I now live in Switzerland. I have a locally purchased turntable, which is good for me. a friend asked if he can borrow my Onkyo. Switzerland voltage is 220/50 cycle. the turntable says it is voltage 100~ 50/60. I am...
  7. F

    Oh no, Sony TA-1120

    Hi Felt like the luckiest guy on the planet, got hold of a very nice TA-1120, the original without the headphone jack. With a original, also nice wooden box and pristine faceplate. I guess it has been a problemchild, since the power amp was bypassed, and previous owner tried to use it as a pre...
  8. kidsreturn

    [HELP!] AC Voltage leakage in TEAC A3340 Tape deck

    Hi everyone, hope you are doing well. I have recently bought a TEAC A3340 tape deck (ungrounded), and noticed that when I was connecting the GND electrode at the back of the chassis to earth, I got an instant power outage. When I am probing the chassis with my digital voltmeter while the unit...
  9. ajmich

    Perpetuum Ebner REX A-4 Turntable / Changer Issues

    Seeking information for restoring this classic P-E record changer, Model REX A-4. It is an approximate replacement for the missing changer in my 1955 Grundig 8050/USA hifi set. The 3 small belts are on order (not shown here). The motor does not turn; I just discovered that the voltage...
  10. cicada_17

    230V Avid Volvere turntable for U.S. use with 110V power supply?

    Hi, first post, am in need of advice regarding an overseas turntable. I have the opportunity to bring back a U.K. spec Avid Volvere turntable. My question is, can I simply purchase an Avid power supply that takes 110V/60hz U.S. voltage to power the turntable motor? Or would the motor be wired...
    • cicada_17
    • Thread
    • motor power supply turntable voltage
    • Replies: 3
    • Forum: Turntables
  11. M

    Capacitor voltage rating

    I'm wondering about voltage ratings on electrolytic capacitors. I know it is possile to use a capacitor with a higher voltage rating - but how much higher is ok? I'm re-capping a Pioneer receiver and there are a number of 100uF caps, some rated 16v, some 25v and some 35v. Now, I have in stock...
    • M1keC
    • Thread
    • capcacitor electrolytic voltage
    • Replies: 6
    • Forum: DIY
  12. ocdecio

    2440 European model - transformer wiring

    I got this 2440 and it turns out it is an European model (it is lableled 2240E on the back, it has no fuse box and the power cord is odd looking). Inside we can clearly see there are options to change the voltage. The service manual says nothing about how to wire this particular version - how...
  13. H

    Amplifier - 110V to 240V mains transformer

    Mains voltage in the UK is 240V. If I want to use an integrated amplifier of 400W or so and it’s spec is 110V.... what type, or level of quality do I need for a step down transformer? What specs should I be looking for in the transformer? Presuming that I can’t just plug in a 110V travel adapter...
  14. crkeith65

    Kenwood KR4010 I killed it and need help

    A friend asked me to service his Kenwood KR4010. It played but was real noisy so I knew it needed the usual De-Oxit treatment. I recapped the Power Supply section and had it sounding pretty good with one small problem. Sometimes the left channel sounded like a broken speaker. A little freeze...
    • crkeith65
    • Thread
    • kenwood kr 4010 kr4010 no power offset power supply sansui voltage
    • Replies: 2
    • Forum: Solid State
  15. Zach Nelson

    Using variac always with Scott 222c

    I heard a guy say that he always runs hit Scott through a variac to keep it at 117v. Is there any real reason for this? I understand wall sockets can be 120-125v, just curious if that was enough to damage a amp that has be restored.
  16. Diobestia

    Marantz 2245 voltage conversion mystery?!

    Hi guys, I'm about to finish the restauration of a nice Marantz 2245 and one of the last steps is driving me insane. Here in France,domestic voltage use to be 220V and most of the vintage gears you'll find around are set on this. But over the years, voltage has evolved to almost 240V. So to...
  17. JayPare

    Technics SA-160, power transformer output too high

    I'm in the process of bringing back to life a SA-160 only to help me improve my electronic skills. I think I'm pretty close to get it back to life (link to the main thread), but I'm worried about voltage too high from the power source circuit: Indeed, I'm getting -43 and +43V instead of -35.5...
    • JayPare
    • Thread
    • power transfomer repair technics voltage
    • Replies: 8
    • Forum: Solid State
  18. M

    Need help - 5010 tape deck volt conversion

    Hi I have a marantz 5010 European model stuck on 220 volts. There is an adjustment knob that ironically does not turn. I don’t know if it is simply old and jammed, but I want to be careful. Any help is very appreciated!
  19. david winter

    1060 - Can't get half voltage at output caps

    Hi, I have done this model more than once and don't understand the problem. It's fully recaped as usual with Nichicon / Elna. I replaced all 2SC458/1000 on the phono stage, as well as both 2SD438 on the output board (the two new ones I have in stock have a gain of 152-155 so no idea if this is...
  20. F

    Can I use a 110v tube amp in a 220v country?

    This is most probably a very silly question, but it doesn't hurt asking. I'm going to buy a headphone tube amp (the Little Dot MK2, allegedly Class-A) in USA Amazon. Now, I'll take it back to South America where I live, and where the voltage is 220v/60Hz. And, for several reasons, I can only get...
  21. BrianC7927

    Dynaco St-70 Voltage Question

    Hi All, First post and kinda new to tube audio so forgive any ignorance. I purchased about 6 months ago an original Dynaco St-70 amp, not the new ones but an early 60s model. Been enjoying it and it's all be working great, i have a Scott Type 130 pre-amp that it is plugged into. Just...
    • BrianC7927
    • Thread
    • dynaco st-70 potentiometer tube amp voltage
    • Replies: 8
    • Forum: Tube Audio
  22. 70'sMusic

    Power Conditioners - do you use them and do you have a recommendation?

    Hi Everyone, Got a question for the collective wisdom of the group - been thinking about purchasing a power conditioner. But, I'm having trouble determining how many AMPs I need. I've look at the back of my receiver and I've checked the owner's manual for a couple of my devices but all I find...
  23. P

    Pioneer C-77 and M-77 voltage

    Hi everyone, I bought a Pioneer C-77 and m-77 yesterday in great shape. I have been jonesing for a spec system for a while now. So, my system has begun. However, I got it home and realized there was a possibility that I needed to change something or verify if the unit has been adapted to run on...
  24. seaneee

    Step Up Transformer Reccos

    I just bought a Luxman Amp from Japan and it's 100v. I need to step it up to 120v. Looking for advice on a external transformer or any other options I might have. Thanks.
    • seaneee
    • Thread
    • luxman sq38fd transformer voltage
    • Replies: 1
    • Forum: Tube Audio
  25. Y

    Marantz 2220B bad J812 and J808 Voltage

    Howdy, Still working on my receiver after replacing some components in the PSB already. What's replaced is shown in yellow and what's not been replaced is shown in red. I am getting a reading of ~5V @ J808 and ~5V @ J812. Per the manual J812 should be getting 35V and J808 should be getting...
    • Yahn
    • Thread
    • 2220 2220b h805 h806 j808 j812 marantz resistor voltage
    • Replies: 25
    • Forum: Marantz Audio
Back
Top Bottom