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repair

  1. M

    Help with DBX 3BX

    Hello, I am trying to repair a DBX 3BX Series I (revision 2, the one without the daughter boards). Some things I managed to fix but I still have a problem with the MF circuit. As soon as I raise the expansion, no matter the transition level, the output goes up as you can see in this video...
    • _MBK
    • Thread
    • 3bx dbx repair
    • Replies: 0
    • Forum: DIY
  2. Alonia

    NAD Model 300 repair

    After a long time where I was no longer active here I would like to throw an interesting project into the room and maybe someone can help me. Normally I mainly deal with Yamaha devices but for once a NAD Model 300 has found its way onto my desk.;):biggrin: There was a note on the lid...
    • Alonia
    • Thread
    • nad nad model 60 repair repair amplifier
    • Replies: 5
    • Forum: Solid State
  3. L

    Repair help: Yamaha AX-540 amp

    Love my old AX but the left channel sounds slightly "dull" compared to right channel. At first I thought it was just a volume difference, but it also lacks some brilliance compared to the other channel. Sitting at ideal listening position, the right channel sounds brighter and louder. I have...
    • Ludd
    • Thread
    • amplifier repair yamaha
    • Replies: 6
    • Forum: DIY
  4. Wordman

    Repair near Knoxville, TN

    Hello! Been a member for a long while, but haven't been on in a very long time. I have the full Heathkit Professional set w/AA-1800 amplifier and a DUAL turntable. Does anyone know of a place somewhere within a few hours drive of Knoxville, TN (or The Villages, FL) where I can take the various...
  5. V

    Pioneer SX 727

    Hi, I bought a Pioneer SX 727. I noticed two things. One, the bass knob doesn’t go full power, it goes only 3/4s of the way. In addition, whenever i turn from fm to phono or other, there is quite a loud static noise.
  6. angelaudio

    Help with Heat Damage on PCB of Mitsubishi DA-A30

    I opened up my Mitsubishi DA-A30 to set the idle current and center potential adjustment and immediately noticed some heat stress marks on one of the PCB boards (CTL-56). It appears that the heat stress is right underneath two 820ohm 2W resistors R313 & R314 No other part of any other board...
  7. I

    Resources request on how to repair vintage audio devices

    Hello! I want to learn to repair reel-to-reel, pick-up and amplituners. I have a minimal knowlegde about electronics. I tried to search on the web for useful materials but I am only able to find some general electronics documentation. If anyone knows some books, courses, tutorials, please...
    • ITChristian
    • Thread
    • amplituner pickup reel to reel repair
    • Replies: 5
    • Forum: DIY
  8. Freestone

    Pioneer SA-6700 Power on, No Sound

    Hi all, I am new to audio equipment, audio karma, and vintage electronics. I purchased my late model SA-6700 in its current condition for $90 because I love the look of it and have experienced the high quality sound from a similar Amp in the past. I have been wanting to get a nice setup for a...
  9. M

    Advice on repairing my Infinity speakers

    Hi! I have a pair of infinity RS5000 that need some love. The boxes are broken, foam is long gone, woofers are dirty and some of the plastic is broken. I also assume that the capacitors are not in the best shape. I asked about them here few months ago and was told I need to do a lot of work...
  10. MorrisonAgen

    SX-1050 with slightly different levels between channels

    Hey all! I have a client with an SX-1050 that I restored for him a few years ago. I went to his place last week to install a phono cartridge for him a do a little cleanup on a Marantz 2335 that he just bought. He mentioned that he was getting a SLIGHTLY higher output out of the right channel...
  11. Allison3

    Citation 16 diagnosis/repair needed in MA/Southern NH/RI, please help!

    My wonderful HK Citation 16 has developed an increasingly persistent hum and has been acting (increasingly) dodgy over the past couple of weeks. I'm so frustrated trying to find a good tech near me, but if anyone knows someone who could check it out in MA/Southern NH/RI I would be super grateful.
  12. S

    Hacked up Pioneer SA-9100 restoration

    A friend decided to buy a SA-9100 unseen and having no amp restoration experience, and me having a few sucesses under my belt, he passed it to me to fix for him. Now of all the amps that have sat upon my work bench in its various forms, I have never seen an amplifier with this degree of...
    • SansuiSushi
    • Thread
    • advice needed bad repairs repair restoration help restoration project sa-9100 repair
    • Replies: 30
    • Forum: Pioneer Audio
  13. AudioScout

    Marantz 2275 Receiver - No Sound Left Channel

    Receiver: Marantz 2275 Problem: No sound, left channel. (Both Speaker and Headphone) What I've done so far: Connected the main out and in via RCA and swapped the cables. Left Channel still out. Swapped P700 Output board positions. left Channel still out. Swapped Output capacitor positions...
  14. G

    In what order would you inspect/test/repair an old speaker?

    Someone in my neighborhood decided to give away their pair of Wharfedale W60D's and I decided I'm going to get into refurbishing vintage speakers. I did some research on them and it seems they have fragile tweeters - and indeed these have one broken tweeter - and can usually use a recap...
    • gravyrobbers
    • Thread
    • diy repair vintage wharfedale
    • Replies: 9
    • Forum: DIY
  15. GrandDesigns

    ADS SAT7 repairs

    I picked up a set of three (3) ADS SAT7 speakers locally for $50 plus a trade in of a box of random old electronics and computer server parts at a local electronics store. The ADS name drew me to these and they have beautiful cabinets, but some research ultimately indicated these were made at...
    • GrandDesigns
    • Thread
    • a/d/s/ ads repair sat sat7 speaker vintage
    • Replies: 0
    • Forum: Speakers
  16. Roman68

    Technics rs bx707.Help!!!

    Hello. I need help with a Technics rs bx707 cassette deck. The tape recorder works and plays perfectly, but unfortunately it suddenly stopped recording. Instead of an input signal, it records a sinusoidal signal with a frequency of approximately 5 kHz. the recording level can be adjusted. When...
    • Roman68
    • Thread
    • cassette repair technics technics rs bx 707
    • Replies: 0
    • Forum: Tape
  17. Frank Wild

    VU meter problem BIC T-1 deck

    Even with the power off, the right needle stays on -7 db. With a tape playing, it's too high,usually over 0 db. The needle isn't stuck: I can move it back to the far left manually, but it returns to -7 when released. Repairable?
    • Frank Wild
    • Thread
    • cassette diy meter repair
    • Replies: 2
    • Forum: Tape
  18. J

    PSB Subsonic 6 issue

    So a few years back I had to change my PSB sub transformer as I moved from the US to Ireland. I replaced the transformer with a toroidal one and all was working perfectly for a few years. A few days ago I have very little output next to zero... When I put the volume up, a rapid noise occurs, and...
    • jvoid22
    • Thread
    • amp repair psb repair subwoofer
    • Replies: 0
    • Forum: DIY
  19. 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...
  20. L

    Replacement dust cap B&W CDM 7NT / 704

    Hello all, Lately I have been busy repairing some CDM 7NT's by B&W. First I replaced tweeters repaired the grills and so on. I am now at the last stage where I am replacing the dust caps, since one was cracked. The problem which now occurs is the following. Practicaly minded as I am I already...
    • LarsGkz
    • Thread
    • bowers & wilkins repair speaker repair
    • Replies: 1
    • Forum: DIY
  21. J

    RTR HPR-12 (Non/Pre magnum

    Hi all, I just picked up this pair of RTR HPR-12 and have a few questions. I bought these knowing they would need some work, its something I have wanted to try for a while now and am hoping you will be able to give me some guidance. I have a few questions to start 1. This is a simple one but...
    • jonoo
    • Thread
    • #technical support repair
    • Replies: 1
    • Forum: Speakers
  22. T

    wega v-4810 (sony ta-5650 v-fet) right channel lower volume and missing low frequencies dead v-fets? (problem isolated to the power amp section)

    I bought a v-4810 for not a lot of money and I wanted to keep it for myself, however the right channel is not working correctly. I did some testing and sadly the issue lies in the power amp section. Could someone tell me if there is a way to know whether this is caused by defective v-fets or...
  23. W

    Beomaster 3000-2 full distortion from right channel

    I have a full distortion from right channel. From the voltage and signal trace I did I discovered that there is no output voltage and signal from 496 diode.I changed the diode but still nothing I swapped the transistors tr45 46 47 50 from the other channel but still nothing. I swapped the...
    • wumpi
    • Thread
    • bang and olufsen beomaster distortion repair vintage amplifier
    • Replies: 0
    • Forum: Solid State
  24. R

    Denon DP-40F power supply problem

    Hello everyone! Sorry for starting the first post from a problem. Just got Denon DP-40F in very good conditions - without scratches, broken off pieces of wood cabinet, and so - which is very rare on the marker, bur somehow it does not power on. The symptom is a bit strange: when press the...
  25. 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...
    • Virus
    • Thread
    • cd player fix help issue nakamiachi power repair
    • Replies: 0
    • Forum: Digital Sources
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