power

  1. richardg0n

    Why Does 2325 Amp Have Full Voltage Readings W/O PWR Supply?

    I am troubleshooting a possible short on one of the 2325 amps connected to a DBT and only having one amp in the receiver. I have the RCA connected to the amp only. Can someone explain why I can take full voltage readings with my multimeter on the components without the amp power ribbon...
  2. elkasdad

    Model 24 won’t power OFF

    My Model Twenty Four will not power off. Into the back of the preamp’s switched power outlets I have a Model 250 amp plugged into the outlet with the “protector” and an AR “the turntable” plugged into a second of the three “switched” outlets. The amp and the turntable are receiving power and...
  3. M

    ADC Sound Shaper Two Voltage Output Or Service Manual

    Hello everyone. I am looking for the power output readings of the Sound Shaper Two. Not the MKII. I can find no information or crossreference on this transformer.This is a P-100686 with a 3 wire output. 1 black, 1 brown and 1 grey. I also can't locate a service manual This would solve all of my...
  4. Virus

    An electric clicky sound, Nakamichi CD player won't turn on

    I've just done a classic repair of replacing the belts on my Nakamichi MB-3 and everything works but a new problem arose. When I power it on, the relay sends electric surges in an attempt to start the CD player to no avail (you can see the electricity between the board and film that's zip-tied...
  5. D

    Music Hall MMF 5 won't turn on? Right power cable

    So I found a Music Hall MMF 5 table at the thrift for a decent price. It had no power cable. I got one off of Amazon that I thought would work, but it doesn't. I'm thinking that that's because the cable I got uses DC power. I found out that I need AC power, but some of the OEM cables cost $40+...
  6. foo.kamikaze

    Pioneer SX-727: Protection Mystery Caused by Power Supply?

    Hi folks, I have an elusive and mysterious protection issue I believe originates from the power supply. HISTORY I bought a working Pioneer SX-727 up until I decided to begin rebuilding. I did my research on Audiokarma as I always do before jumping into a rebuild. The first day of the rebuild I...
  7. B

    Need to find VU meters for Marantz 500

    They say fs.. 200uA on the back.
  8. richardg0n

    McIntosh MX 112 FM/AM Stations Suddenly Gone

    Greetings AK, I was listening to FM stations on my MX112 and noticed FM reception began fading and a short while later I could no longer receive FM stations. I noticed the tuning tube is still on but no longer fluctuating while tuning in stations. A few years ago I recapped the power supply...
  9. DoctorJon

    Question about protecting my stereo with a surge protecter.

    Hi all, I have a question about how you protect your home from a stereo that is older from burning out when you are unexpecting it. I have a Pioneer SX-3700 reciever that I want to protect both from a surge and the chance that it would have heat sink problem that would result in electrical...
  10. david winter

    Heathkit AA-40 - strange voltages at 6AN8A plates

    Hi, I have been working on a Heathkit AA-40 amp for which I did the following works: - Set to 230V mode (powered at 240Vac). - Surgistor replaced with CL-90 varistor - Tubes: two NOS Sylvania 6AN8A + four good EL34 - All electrolytics and coupling caps replaced - Most resistors replaced (out of...
  11. C

    Fault finding or fix a dead CD player, Nak MB-3

    Hello, I have a Nakamichi MB-3 CD player that is completely dead. Looking for either tips on fixing it, or where to source a replacement power transformer if that turns out to be the problem. Here's what I know: It was dead when I got it. It was free with a working tape deck I bought. So I...
  12. KD2KGA

    Power & Fuses

    Quick story with advice and then a question at the end. I have a Pioneer SA-8800 that I had recapped by a tech years ago. Now I'm getting into doing things for myself and recently recapped a Technics SA-200 that I found. And look, I'm still alive. I had some power issues a few months back with...
  13. M

    SX-1250 died

    Hello, total Noob here. I inherited an SX-1250, decent condition, a few months ago. It worked ok. A few weeks ago, I took it apart and cleaned all the switches and contacts and it worked beautifully after that. Yesterday, the receiver was idle for several minutes after listening to some music...
  14. H

    Marantz PM7200 doesn't start after cleaning

    Hello everyone. I would like to get your ideas what went wrong with my amp. I bought it recently and it was very dirty - all pcb’s were covered with thick layer of dust. I cleaned dust with brush and pcb with spirit and contact cleaner, then cleaned with cotton buds. After that I switched on...
  15. C

    Yamaha NS-W1 Subwoofer - stopped powering on

    Was wondering why my bottom-end had gone away, my Yamaha NS-W1 from early 80's died. No light and no power. Took it to the bench, removed the bottom and side grills. I'm not electrically inclined at all. I have a multimeter and the service manual for it. Where do i start? No loose wires or...
  16. Preston8452

    Power, Network, Connection, Which one matters the most to you?

    Hi guys, When it comes to sound quality, I've realized there're freaking many factors could affect it, some say the DAC is the paramount thing to be taken care of; some say the speakers are the real crucial part, given that you hear all the sounds from them, there's no certain right or wrong...
  17. davstev

    When you can't power up a Sansui 210

    Hi All, I have inherited a 10 WPC Sansui 210. Cute little thing, seems to get pretty good reviews. It won't power on. I tested all the fuses inside the unit with my DMM, and they test fine. No fuses on the back. The former owner said that he heard a pop or something like that, and after, the...
  18. Theartemis

    Grundig Majestic SO190Ua1

    Hello, I hope I’m in the right place. I have been on the search for a few years for a Grundig Majestic (SO190Ua1) and finally found one at a decent price. I love her! However, she doesn’t seem to be getting power. I’ve tested the power in and power out and both have power, I don’t really know...
  19. Racingh11

    How to increase power (MCS 3235 to 3245)

    I recently modified an MCS 3245 receiver to greater power output using a 3275 transformer and other modifications. It can be read in this thread: https://audiokarma.org/forums/index.php?threads/how-to-increase-power-mcs-3245-to-3275.968122/ The second conversion I did in that thread left me...
  20. vheintz

    Just getting started. speaker size, wattage, room size

    I'm curious to know if there is a formula to determine speaker size and power in relation to the listening room. My listening room is 14' wide (speaker wall) x 12' long x 9' high. modern construction (dry wall), concrete floor under glued hardwood floor. one window with heavy curtains to the...
  21. U

    HK 430 no power

    Hi all- I'm a newbie here, just started collecting vintage gear. Picked up an HK 430 yesterday, and ran into a not small problem that it will not power up at all. No lights, nothing. I opened it up and didn't see any blown fuses or other obvious signs of failure. Anyone have any ideas about...
  22. tlite

    How to Measure Power of Amp's Headphone Jack

    Specifically trying to figure out what the power output is of my Marantz 2235's headphone out, and what headphones is can reasonably drive without additional amplification. I understand I can just buy headphones plug them in and if they sound good, then it is good, but I'm curious as to how to...
  23. AdventDude

    Hafler XL-280 power problem (hoping for guidance)

    Greetings, A very close friend from high school convinced me to go the Hafler route many years back and I purchased both a DH-110 preamps and XL-280 (both in kit form) just about 35 years back. Though I've had a few minor connectivity issues arise over the past few years with the DH-110, the...
  24. S

    Pioneer sx 450 won't power on

    I'm having a problem with my pioneer sx450. It's flickering and won't power on. At first everyone said it was the power switch so I tried to clean it but then when I disconnected my speakers I could hear this crackling from the transmitter. I didn't think this was Normal but I wanted to confirm...
  25. david winter

    Luxman L-31 power switch replacement model

    Hi, Is there a model of power switch which fits the Luxman L-31 ? As I don't have the amp with me right now, I can't even try to see what can directly replace it. Thanks !
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