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transformer

  1. Dr.Turner

    Proton AT-470 needs ICU

    Hi everybody, before proceeding with my next repair as voted here, I would like to revive the Proton AT-470 tuner, companion to the Proton AM-452 amp I recently recapped and restored. Problem: the tuner is not turning on at all. I started with DBT (fine) and visual inspection: two jumpers...
    • Dr.Turner
    • Thread
    • proton at-470 transformer
    • Replies: 6
    • Forum: Tuners
  2. M

    Sansui Newb - need AU-505 transformer

    Hi Team, absolute Sansui newb here. I've acquired an AU-505 that needs a transformer. Any clues as to where / how I can get one would be super-appreciated. Thanks David
  3. S

    In need of help (again) identifying some mystery (allegedly Fisher 125) transformers

    I got these from a friend who got them decades ago from a guy who said they were out of a pair of Fisher 125s. I believe he laid eyes on them as he said he passed on the transformers, but the number of pins on a 125AX opt transformer on the schematic is far greater in number than what is on...
  4. K

    MX110 Transformer: source for rebuild

    I’ve run into a McIntosh MX110 with a failed secondary on the transformer. One half of the high voltage secondary measures 40 Ohms and the other half is open circuit (high voltage secondary is the red taps). Audible symptom is that the unit has a hum. I observe a 60Hz ripple on the high...
  5. 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...
    • Racingh11
    • Thread
    • 3235 3245 mcs modular component systems power receiver transformer upgrade
    • Replies: 34
    • Forum: Solid State
  6. M

    Marantz 2500 stopped work after 40 minutes of playing music. Did the transformer burn out?

    Today my Marantz 2500 stopped work after 40 minutes of music. The only thing that works now is the fan at very high speed. There is no burning smell. Did the transformer burn out? All fuses are OK. I don't have the skills to do this, but I already have a place to buy a new toroidal and send it...
  7. PE9ZZ

    Denon PMA-790 eats fuses (but not anymore)

    I got this great amp in after an extensive repair/refurb. The refurb was valid only the amp returned with the complaint "blown fuses". Indeed, the fuses in the line for the power output (2x 6.3AT) had failed. Could not find anything amiss but upon returning the amp the fuses were found to be...
    • PE9ZZ
    • Thread
    • denon fuse pma-790 toroid transformer
    • Replies: 6
    • Forum: Solid State
  8. dankik

    Need Help Marantz 2252b Relay Getting Hot

    Hi, I'm a new member in this forum. I have been reading all of your helpful responses for many years, but finally joined. I had a new Marantz 2230 when I was in college and sold it long ago. Recently I bought a used 2252b in working condition from Goodwill and recapped the electrolytic...
    • dankik
    • Thread
    • 2252b relay speaker protection transformer
    • Replies: 25
    • Forum: Marantz Audio
  9. R

    Marantz 1060 transformer terminal block jumper settings

    Can anyone confirm that the service manual and/or schematic are correct? My 1060 project has a two bladed Nema style 1-15P plug on it, but it looks inside like it is wired for 220V based on page 7 of the service manual. Also interesting is that the schematic and page 7 disagree somewhat. The...
  10. A

    Yamaha KX-360 transformer

    Hello, I'm planning to replace the transformer of my Yamaha KX-360 cassette deck. Originally it was a 120v unit, but the dealer had recently replaced the transformer to 220v (Indian std.). It deck running fine, but the quality of the transformer is terrible, and so is the quality of solder. I'm...
  11. ocdecio

    Using a 1070 transformer on a 1040

    There is a person on FB that has a fried 1040 transformer and I was trying to help troubleshoot. I found a 1070 transformer online, but the voltages are slighgtly higher on the 1070, mainly on the secondary that feeds the power amp boards. The 1040 reads +-32V and the 1070 +-36V. I think the...
  12. ocdecio

    Transformer protective carton "wings"

    Does anyone know what to use to replace broken protective carton "wings" on a transformer: I could leave it alone but it doesn't feel right with all the connections exposed to the top cover.
  13. AstroZon

    Teac TT-1 Audio Timer

    No issues - it works fine. Just wanted to post a pic of the insides. I get a kick out of how well made this ordinary audio timer is. No way would anyone now put a hefty relay, transformer, that nice circuit board, and thick aluminum faceplate on something as pedestrian as a timer...
    • AstroZon
    • Thread
    • audio timer cpu insides relay teac transformer
    • Replies: 3
    • Forum: Solid State
  14. Moonwatcher

    Magnavox 9303: Switching speaker impedance

    Tube newbie here: So, depending on what I'm listening to, I use both 8 ohm Wharfedale W60s and 4 ohm Smaller Advents with a Magnavox 9303 modified (not by me) with Edcor transformers that have 4, 8 and 16 (I think) ohm taps. Currently the 8 ohm taps are attached to the binding posts, because I...
    • Moonwatcher
    • Thread
    • impedance magnavox 9303 ohms taps transformer
    • Replies: 11
    • Forum: Tube Audio
  15. ogodei

    Discolored 'golden' label on MC240 power transformer ?

    I purchased a well-used MC240 for restoration. After receiving it I noticed the label on the M-207A power transformer was discolored; specifically, the area that's usually black was a very light gold or golden-brown. The labels on the 210 A & B had a black background as normal. I didn't think...
  16. S

    Rewiring a transformer, using single insulated wire over double insulated?

    Pioneer thought it would be a fantastic idea to wire-wrap the transformer to the PCB. So, unfortunately, my only choice here is to undo the wire-wraps in order to remove the PCB. The problem is that the brittle 37 year old wire is now not long enough for me to create a new wire-wrap connection...
    • Saffire
    • Thread
    • diy transformer wire wire wraps wiring
    • Replies: 3
    • Forum: DIY
  17. D

    Transformer replacement for AU217

    Recently, I bought a non-working AU217. The fault was a blown internal fuse in the transformer. I managed to get it out and made a bypass. Now the amp is working. Still, I‘m a bit worried, because I had to ply and cut some isolating paper etc. Is there somebody who van advise me on buiing a...
  18. matjo

    power supply issues on NAD C320 Amplifier

    Dear AK friends, A friend of mine brought a couple of NAD amplifiers (C320 and C370) with issues. Although I am more a Sansui-Guy, I just thought I would give it a try in finding out the problem. Tee C320 does not turn on at all, so I thought that would be the easiest one...... but I am lost...
    • matjo
    • Thread
    • nad c320 power supply transformer
    • Replies: 18
    • Forum: Solid State
  19. postman56

    Replacement or repair options for a Heathkit W5M Power Transformer?

    I would appreciate any information on having a Heathkit W5M mono amplifier's power transformer repaired? I'm not a skilled tech, so any experience in this area would be much appreciated or recommendations .
  20. LittleBill

    Akai AA-1150 Receiver Repair and Recap

    Hi AKers! I just finished my first receiver repair that involved more than just replacing bulbs. My goal was to repair the unit and replace electrolytic caps as a maintenance measure. I thought I'd post my notes and some photos. I've learned a ton from AK since being bitten by the vintage...
    • LittleBill
    • Thread
    • aa-1150 akai primary winding recap repair transformer
    • Replies: 16
    • Forum: Solid State
  21. S

    AN-10440 Quality ?

    Hi guys, Im planning to buy the AN-10440 transformer to build my amp. Any opinion regarding this transformer?
  22. Recaptcha

    Anyone up for Transformer Rewind?

    Hi, First I want to say, I'm not quite sure where to post this, it seems to me that the DIY section is where it should go, but I'm not sure, so forgive me if I am wrong... OK, I have a very rare turntable that has a 100v transformer. I need it to be rewound for 120v. It would require...
    • Recaptcha
    • Thread
    • audio power transformer
    • Replies: 25
    • Forum: DIY
  23. danwhitham

    Western Electric 2008B Input Transformer Data 2K64

    Hello all, Typically I try not to create threads asking simple questions, but I have run into an issue attempting to research the specs/data-sheets for a pair of Western Electric 2008B input transformers. I have spent the last few days searching through WECO transformer lists between the...
    • danwhitham
    • Thread
    • input transformer transformer weco western electric
    • Replies: 1
    • Forum: Tube Audio
  24. A

    My amplifier in not working.. Even i didnt switched ON.. how to test the transformer

    how to test my transformer.. please help.. i have a doubt on transformer...
    • Anto Besline
    • Thread
    • amplifier not working testing coils transformer transformer connection transformer problem
    • Replies: 1
    • Forum: DIY
  25. runningdog

    Marantz 2230 transformer with open secondary

    I have a 2230 with an open secondary. It is the pair going to the rectifier. There is power to the lights and the power supply. I'd like to fix rather than replace this transformer if possible. I see that some (all?) 2230 transformers have a thermal fuse. But would that affect only a single...
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