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transformer

  1. LuisNiels

    Realistic EQ 31-2000A Transformer

    hello everyone, my Realistic 31-2000A EQ stop working, i heard a pop and it went dead.. -visual inspection found nothing burned. -started checking the power supply voltages and it was not working. -checked continuity on secondary transformer windings (2) and they are fine. -checked continuity...
  2. Johnny_Law

    CR-1020: After recap stuck in protection SOLVED

    Edit: Solved, see post #82. If your CR-1020 is stuck in protection, and the FM tuner dial is stuck to the left of center, check TR712 and TR715 on your Power Supply board! I just recapped my CR-1020 (electrolytic board, power supply / protection board, main amp boards) and now my DBT burns...
  3. mygoggie

    Quad 303 power transformer lamination varnish

    Hi, maybe one of you have an answer to this. I am currently restoring a 1969 Quad 303 which was severely abused and then abandoned. The question has now arisen whether the main transformer's laminations were varnished before assembly or was the whole unit assembled and then varnished? The...
  4. Hayduke77

    Mcintosh MA5200 from US to UK

    Hi and thanks in advance to anyone with any experience or advice on this one. I'm moving to the UK in January and have a MA5200 integrated. Of course I want to bring it - but need to know the proper gear to buy to use it in the UK (220v). Can anyone recommend a great step-down...
    • Hayduke77
    • Thread
    • conversion ma5200 mcintosh transformer uk hifi us audio
    • Replies: 13
    • Forum: McIntosh Audio
  5. runningdog

    2325 transformer goes "boiing" when powered on

    The transformer on this Marantz 2325 makes a noise for a second when powered on. Like a "boiing" springy kind of sound. Not every time it is turned on. Maybe 1/2 the time. Sometimes several times in a row, sometimes not. It is definitely the transformer as I can feel it as well as hear it. It...
  6. P

    Classe CA-100 Soft Start Help Needed

    I messed up my Classe CA-100! I noticed a VERY faint hum coming from the toroidal transformer inside the chassis. I tried to quiet it by loosening the transformer and repositioning the rubber iso pads and cranking the bolt tight. But after doing that the amp no longer turns on. I hear and...
  7. Jock Strap

    Power Transformer Temperature - what is too hot?

    Does anyone have any guidelines on how hot a power transformer should be? I have a Leak Stereo 20 that I recently refurbished. It sounds excellent but I want to know what is normal for the transformer temperature. Currently, the power transformer is hot to touch but I can leave my hand on it...
  8. N

    Realistic APM-200 dead

    Hi, I have an APM-200 which do not do anything when plugged in, looks like the power transformer is dead. The transformer has a dual phase AC output but I am not sure about the voltage. I think, I have seen the lamps are 12v, so could it be a 12v-0-12v output. Also the power and watt switches...
    • newclassA
    • Thread
    • 200 apm apm-200 lamp realistic transformer vu meter
    • Replies: 15
    • Forum: DIY
  9. K

    Audiosource Amp210

    I have to take the hood off every amp.Thought yall would wanna see.All i could afford right now.Its discrete design with a toroid xformer.Someone may know,are the output transistofs Toshiba? Also if someone has the schematic and service manual can you email it to me? I took photos under the hood.
    • klipschoid
    • Thread
    • amplifier audiosource discrete toroidal transformer
    • Replies: 0
    • Forum: Solid State
  10. M

    2270 transformer testing

    Hey All, I began recapping my 2270 this week and ran into some trouble. This is my first time doing this. First I did the power supply, reassembled and everything was working great. Next, I replaced the power switch and tested, again, no problem. Then I did three caps on each P750 board, but...
  11. Mike Sweeney

    Need a picture

    I need a high res picture of the top of a marantz transformer showing the label. This is for my 2285B which has the label and paint rust away :/ i plan to recreate the label after i repaint the transformer so any help would be appreciated
  12. 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
  13. deedawson

    No power on 4300

    Hey all, I am in high hopes of restoring a 4300 quad. I received this unit free but not working. It appears to be in great shape cosmetically. I plan on replacing capacitors one board at a time starting with the power supply. However, before I get involved in doing anything with this unit I...
  14. D

    Quad 303 transformer

    Hi! I'm building a quad 303 clone and just purchased a NOS original transformer, I think I got the wiring right but wanted to be sure before firing it up. Does this seem right to you guys ? Thanks in advance.
    • depaj
    • Thread
    • quad 303 transformer wiring diagram
    • Replies: 0
    • Forum: Solid State
  15. FireGuruMN

    Harman Kardon Citation Twelve Deluxe Transformers

    I have a Citation Twelve Deluxe in very good condition except someone has apparently stripped it of its transformers for scrap value. The were not removed as though they were being salvaged for parts. The wires were just cut off at the transformer and the transformers removed. Very sad...
    • FireGuruMN
    • Thread
    • harman kardon citation twelve deluxe transformer
    • Replies: 5
    • Forum: Solid State
  16. P

    Step Down Transformer or Variac 120/110 to 100

    Hi, I'm about to purchase a Japanese SA-CD player which requires 100 volts. I don't want to belabor a topic that has been discussed a fair amount, but my question is fairly specific. Correct me if I'm wrong. A transformer is a fairly 'dumb' device that may not deliver the exact specified...
  17. thorpej

    Help deciphering an old choke (actually a vertical sweep transformer?)

    Howdy folks... I've got a couple of chokes scavenged out of an old 1960 RCA TV. One of them is pretty small, and measures 899 mH @ 120Hz on my Agilent U1732C. This smaller one I've found on the Photofact for the TV -- RCA 94341-15, rated at 600 mH @ 270mA, DC resistance 46 ohms. I figure...
  18. Replycant

    Pioneer SX-1280/1980 transformers. What's inside that big can?

    Hi all, New to the forum, but not to vintage audio... ;-) I think this may be a good place to post this question: Have you ever see what's inside these huge pot sized transformer cans? I mean, is there a single toroidal or two of them stacked up? (they look way too high for a single one...
    • Replycant
    • Thread
    • 1280 1980 pioneer transformer
    • Replies: 4
    • Forum: DIY
  19. Schmidlapper

    6v6 PP choosing between 9k and 12.8k tran

    I have a great sounding and looking little rebuilt Magnavox 8802 that really is limited by the output transformers, I also have an old pair of 30w PP transformers laying around, so I think to myself project time. I just don't know which load would be the better option. RCA says 10k for 6V6 pp...
  20. kjello

    How to fix transformer noise

    Hi I have a small problem with my subwoofer amplifier. Its a Zachry DSW-400 mono plate amplifier The problem is noise, which I belive comes from the transformer. When I turn the power on, the noise is audible, and when the speaker relay switches on the noise gets amplified through the woofer...
    • kjello
    • Thread
    • amplifier hum noise subwoofer transformer zachry
    • Replies: 19
    • Forum: DIY
  21. Longaevus

    Humming Carver PM-1.5

    In order to properly feed a pair of JBL's Ti-3000 I recently traded, I purchased the aforementioned Carver power amp only to find out two strange behaviors: A) buzzing speakers - the speakers have a permanent buzzing sound that increases when both/either left and right gain controls of the amp...
    • Longaevus
    • Thread
    • buzz carver ground hum noise transformer
    • Replies: 6
    • Forum: DIY
  22. Richs_Trains

    4400 Transformer Hum

    Just curious as I am new to my 4400. It has a noticeable hum, quiet but there, coming from what seems is the main transformer and I was just wondering if someone else with a 4400 could let me know if they hear a quiet hum when it is on and not playing? Of course, when the sound is on, you...
  23. B

    Using UK hifi in the US: voltage query

    Hi AK forum members I have just moved to the USA from the UK and brought my UK hifi with me; a Creek 4140 S2 amp and a Creek T40 Tuner. I can't get my head around what Step-up/step-down transformer to get (500w, 1000w etc) so I thought I would ask here. At the back of the amp above the power...
  24. runningdog

    2240B how to confirm if transformer has failed?

    I have a 2240B that just died. I'm reading 3.5VAC off the two yellow wires going to the power supply from the transformer. The two orange wires from the transformer to the rectifier are showing about 2.0VAC. Both show infinite resistance. The panel lamps light up. So the fuse and switch must be...
  25. DavidL63

    Need info on Dukane 1A901C amp outputs

    I'm new to Audiokarma, and I'm looking forward to having all of the knowledge out there help me. Part of my job is to keep old gear working for a ministry which has a limited budget... I have a Dukane 1A901C amp and am being asked to put it in the e-Waste dumpster due to its age. But I want...
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