• 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

power transformer

  1. ArthurTut

    Light Transformer Buzz in Sony TA-1080

    I recently picked up a Sony TA-1080 at a good price. I did not have an opportunity to test it before buying it. It appears in excellent condition. It is quite clean for a 59+ year-old unit in all details including the wooden case. Whenever I buy a vintage unit like this, I take a lot of time...
  2. Walterramjet

    Pioneer SX-434 Power Board issue

    Yesterday, I received my new-to-me Pioneer SX-434. The ad on ebay said it was recently serviced and in good working order. The trouble is, I discover after plugging in that the only thing working are the dashboard lights. That makes sense because the transformer secondary that feeds the lamp...
    • Walterramjet
    • Thread
    • assy awr-062 att-169 att-169c pioneer power transformer sm-wbv sx-434 transformer
    • Replies: 4
    • Forum: Solid State
  3. kyledp

    Pioneer PD-4050 CD Player - Dead Power Transformer - MultiVoltage model

    I picked up a Pioneer PD-4050 single Disk CD player that has a power supply called a PTT-1016. The power supply is dead and finding a new one is proving to be a challenge. I found one online and ordered it, only to have the company tell me it's not in stock and won't be. It's still posted on...
    • kyledp
    • Thread
    • power supply assembly power supply mod power transformer
    • Replies: 2
    • Forum: Pioneer Audio
  4. Bryan Whitak

    Power Transformer For CR-640

    I've had my Yamaha CR-640 for probably 17 years now and it hasn't worked for over 10 years. It started blowing fuses. I would replace a fuse and it would instantly blow. Long story short, I have no idea how to fix these things, but recently a retired electrician contacted me and told me he...
    • Bryan Whitak
    • Thread
    • power transformer yamaha cr-640
    • Replies: 10
    • Forum: Yamaha
  5. F

    Help hooking up replacment transformer

    Hey gang. I usually stick to working on turntables, but I got a great deal on a set of Arte Forma 300B monoblocks. One has a bad power transformer, but I decided to take these on as a project and try to learn something so have a newbie question. The original power transformer has secondaries...
  6. Dav3

    What would a magnavox 9300 power transformer run me?

    I picked up a magnavox amplifier from a 9300 console and the power transformer is crispy. What would this probably run me to replace? Transformer model 900195-1. Need to know if I post a WTB if it's in my price range currently. Thanks!
  7. D

    Harman Kardon A-30K (A-300) power supply

    Hi! I just picked up a Harman Kardon A-30K, the kit version of the A-300. It works but someone replaced the power transformer from a 110V primary to a 250V but in doing so he also replaced the doubler circuit with a classic half wave rectifier fed from a 250-0-250v secondary winding. Only...
    • depaj
    • Thread
    • a-300 a-30k harman kardon power supply power transformer
    • Replies: 62
    • Forum: Tube Audio
  8. Florian8

    SA-5270 power transformer characteristics

    Hey guys, hope you're doing right. My grandfather is repairing a Technics SA-5270. He is a retired specialist. However, he accidentally killed the power transformer from bad manipulation while repairing and needs to now what are the secondary tensions of the output of the power transformer...
    • Florian8
    • Thread
    • output value power transformer sa-5270
    • Replies: 2
    • Forum: DIY
  9. F

    Recommendations for new power transformer

    Hey there gang. I recently picked up a pair of Arte Forma 300B monoblocks and one has a shorted power transformer. The tranny is 760V (380-0-380) at 300mA center tapped, 6.3V center tap (3.15-0-3.15) at 3A and two 5V @ 4A (see photos). I'm having trouble finding an exact match. A friend...
    • fmjunkie
    • Thread
    • 300b arte forma power transformer
    • Replies: 8
    • Forum: Tube Audio
  10. OldSubSailor

    Trying to ID a transformer

    I was working though a tote of HV transformers I've had around for a while and came across one that, per the note I'd taped to it years ago, was removed from an old HAM transceiver. It's a large, heavy beast whose leads are typical for a power supply transformer . On the case are the numbers...
    • OldSubSailor
    • Thread
    • a440 dynaco power transformer
    • Replies: 2
    • Forum: DIY
  11. thorpej

    Power transformer question (center-tapped power supply)

    I'm penciling out a project where I plan to use a center-tapped power transformer and FWBR configuration to produce 600V and 300V rails. The Edcor XPWR182 is almost right -- 225-0-225 @ 500mA, with a nice 12.6Vct 4A heater winding. But to get the voltages I want, I really need 235-0-235...
    • thorpej
    • Thread
    • center-tapped edcor power transformer
    • Replies: 2
    • Forum: Tube Audio
  12. T

    Temperature of Fisher 800C power transformer

    My Fisher 800C power transformer measures about 129 degrees F which does seem pretty hot to me. This is not mounted in the wood cabinet. If you guys have time and a laser temperature probe, could you share your temperature readings. Voltages measure at the correct levels in my unit.
    • Tomvette
    • Thread
    • 800c fisher power transformer temperature
    • Replies: 11
    • Forum: Fisher
  13. H

    McIntosh 40 MC40 Can I use KT88 or 6550?

    McIntosh 40 MC40 Can I use KT88 or 6550? Does anyone know the current capability of the filament winding of the power transformer? Thanks
    • Hi-FiGuy
    • Thread
    • 6550 kt88 mc40 mcintosh power transformer power tubes
    • Replies: 21
    • Forum: McIntosh Audio
  14. A

    Power Transformer replacement for Denon DP -37F - Help Please

    Hello All I purchased a Denon DP-37F and it appears to have a bad power transformer. Output should be 12V at 0.22 amps as per service manual. I am only seeing less then 2 volts output and the platter is turning backwards. I want to find a replacement the transformer but I cannot find the...
  15. thorpej

    Mounting considerations for a toroidal power transformer

    I picked up a 400VA toroidal PT for my current project and after doing a few experiments with it last evening, will almost certainly be using it instead of the silly voltage quadrupler scheme I was using before. So now the fun part -- how to mount it. Toroidal transformers are "easy" to mount...
    • thorpej
    • Thread
    • power transformer shorted turn toroidal
    • Replies: 13
    • Forum: Tube Audio
  16. Dandy

    Bias supply for Dynaco ST70 replacement power transformer?

    As my mains voltage is 240V and the original Dynaco ST70 is under-rated, I would like to replace it with a massive PT that I have from an unknown 6L6 organ amplifier. It is the exact chassis size and has the right windings for B+, 5V and 6.3V but no winding for the 55V bias supply. There is a...
    • Dandy
    • Thread
    • dynaco st70 filament supply power transformer
    • Replies: 38
    • Forum: Tube Audio
  17. oldsmobuick

    Time to Replace Power Transformer in Magnavox 8802?

    My Magnavox 8802 has been fully recapped and new resistors all around. It sounds great but there is some tar leaking from the (original) PT, only a very small blob at the moment, and a vibration that is emanating from the transformer. The vibration is pretty noticeable in a quiet room. Should I...
    • oldsmobuick
    • Thread
    • 8802 maggie maggie console magnavox magnavox 8802 mods power transformer
    • Replies: 12
    • Forum: Tube Audio
  18. thorpej

    Adapting "low" voltage power transformers for tube amps

    A legendary Silicon Valley electronics emporium is having a moving sale with by-the-pound discounts (yes, really), so of course I had to pop in today after work and poke around. In addition to some test leads for my scope, for a song I scored 3 identical power transformers marked 9-80-120 that...
    • thorpej
    • Thread
    • power transformer voltage doubler
    • Replies: 9
    • Forum: Tube Audio
  19. A

    Power transformer for Harman Kardon A224

    I was recently given a broken Harman Kardon A224. Supposedly the power transformer is broken. I am a complete newbie to tub amps. How can I get a parts/spec list? How can I get a service manual? Does anyone know the type of power transformer it uses? AK
Back
Top Bottom