repair
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Marantz 4270 Help...
Alright, so I've got a Marantz 4270 with a bad channel, spitting out DC and throwing it into protection mode. Only one of the output transistors was shot, I believe it was the one that handles the negative swing. Otherwise, all the semiconductors on the board and otherwise are testing OK. I can... -
HELP WITH MOTORBOATING IN SYNTH CIRCUIT... Crumar Orchestrator.
I finally got this thing going last night... tons of work and it's a complicated little beast!! But while I had this circuit working for a short time, I swapped out a transistor and now I have some SLOW motorboating going on... that gets faster if I adjust certain parameters. I'm realizing there...- sean sweeney
- Thread
- crumar help motorboating orchestrator repair synth
- Replies: 0
- Forum: Solid State
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Super mysterious volume pot issue
I’m having an issue with a volume pot where where it only works when I hold the knob at a specific angle. When I let go of the knob the left channel plays at a random volume , and the right channel plays at where ever the knob is set. When I jiggle the knob and hold it both channels sync up in... -
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Direct drive servo recordplayer issues.
For reference the record player is a yamaha yp d4 I have this record player that works but has a few issues. The two main ones being that it spins at the correct speeds but it slowly speeds up over time. And also that unless I turn the internal potentio meter all the way up for 33 rpm it just...- TrevorBarten
- Thread
- direct drive recordplayer repair servo yamaha
- Replies: 14
- Forum: Turntables
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FM Generator Reputation
Hello I've been offered one of three FM generators at a very reasonable price. I intend to use it for AM and FM alignments. I don't have a distortion analyzer, so I probably won't be doing MPX alignments, so while I appreciate that one of the two units has stereo, and one does not, I likely...- scootsity5
- Thread
- alignment fm alignment generator repair
- Replies: 4
- Forum: Test Equipment
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Another Advent 300 Rebuild: My First
OK so I'm sure there are a lot of Advent rebuilds on this site but I figured its easier to start a fresh thread. I am new at this repair scene and was hoping folks could help me on my way as I make silly mistakes. I did review a handful of existing threads ahead of time so I had a starting...- Frequency295
- Thread
- advent advent 300 advent model 300 repair
- Replies: 23
- Forum: Solid State
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Weird power issue on this yamaha tc 720?
I have this yamaha tc 720 and apart from all the belts having turned to mush it has a weird issue. I can't really describe it so I made a video. It seems it loses and quickly regains power every second or so. Is this due to the belts not being there or is something else going on?- TrevorBarten
- Thread
- cassette repair yamaha
- Replies: 5
- Forum: Tape
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Yamaha yp-d4 potentio meters?
I have a yp-d4 that I have been working on for a while. I recapped it and cleaned all the pots but the turntable still isn't working correctly. I removed some of the pots out of the circuit and after this it worked fine at 33,3. I also got it to work a few times before after intense cleaning of...- TrevorBarten
- Thread
- help potentio meters repair request yamaha yp-d4
- Replies: 2
- Forum: Turntables
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Anyone try Prof Bizzt Sony PS-X800 hinge pocket strengthening kit
Professor Bizzt used to sell a dustcover hinge pocket strengthening kit for the Sony PS-X800 & PS-X555ES turntables. When I did a search I see where he has sold the kits, but the images are not available. When you go directly to his webstore.com site, they are not listed as being for sale at...- PaperBoy007
- Thread
- dust cover hinge pocket repair sony ps-x555es sony ps-x800
- Replies: 0
- Forum: Turntables
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Anyone else have Altec Lansing 9813b’s ?
Hi gang, I’m getting ready to redo the surrounds on a pair of Altec Lansing 8913b “studio monitor” speakers. Both woofs and mids need sourrounds, mostly ‘cause they look scruffy. Cabinets are pretty nice and they use the “Mantaray” tweeters. This particular pair was actually used as a studio... -
PIONEER SX1500-TD Dead Channel still blowing after output replace
Hi everyone, I am a tech working in Canada. My focus is organs, synths, tape gear, etc... My weakness is Power Amps. I took this one on thinking it had a good output section and trouble in the front end. Turns out the left channel was blown. Fuse open. One output device shorted. I changed the...- automaat
- Thread
- bad channel bias pot replaced output transistors pioneer sx1500td repair
- Replies: 20
- Forum: Solid State
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Cartridge suddenly sounds muffled ?
I was playing aeound a bit with a turnable and trying to figure out what cartridge I should mount on it. When I got to one of my 412 mk3s I figured that it sounded great so I left it on the tt. However after 40 minutes of listening it suddenly started sounding muffled, kinda similar to how a...- TrevorBarten
- Thread
- 412 cartride damaged not working phillips repair turntable
- Replies: 18
- Forum: Turntables
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Turntable buzzes when turned on.
I have been working on am akai 206c deck for a bit now and I got almost everything working, except for a buzzing sound when it's plugged in. When not plugged in it does buzz a bit but it's very faint and basically in audible at listening levels. However when I plug the power cable in there is a...- TrevorBarten
- Thread
- 206c akai broken buzz doesnt work repair
- Replies: 1
- Forum: Turntables
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Seeking Help in Resurrecting my Kenwood KA-8100
Hey all! Yesterday I bought a Kenwood KA-8100 that was advertised as broken. Today I need help in restoring it. The inside and outside of the unit are pretty darn clean. It appears as if one corner of the unit took a drop head on and bent but did a pretty good job of protecting the internals...- Pub Sub
- Thread
- amp amplifier diy integrated kenwood repair
- Replies: 10
- Forum: Kenwood-Trio/Kensonic-Accuphase
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Wolverine LT12 repair
Hey all, I am brand new to this community and it is a very exciting place! The reason I am here is that I am trying to fix a wolverine LT12 driver in my grandparents house. My grandpa installed them I believe in the early 70s and one of them does not work anymore. I did some research and it... -
Acoustic Research AR4x Potentiometer bypass.
I inherited a pair of AR4x speakers a few years ago. They are cosmetically in great shape, all original but they sounded like dogs. Something needed to be done. tmad40blue's thread explains the situation far better than I can. Go here first. Today I decided to bypass the potentiometer...- windsorlad
- Thread
- acoustic ar4x bypass potentiometer repair research
- Replies: 15
- Forum: Speakers
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Polk psw125 subwoofer makes crazy noises
So I got a free sub made by Polkaudio. I have never owned a subwoofer and figured if it is free then I can see if i can repair it. The guy that gave it to me said literally it makes satanic noises (he was joking). So it has an funny switch that is on-auto-stanby, no off properly. When plugged... -
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Any way to prevent a crack in a dustcover hinge ?
My ps x800 dustcover has cracks on the under side of both hinges. Is there any way to prevent those from getting worse ? When the dustcover is on the player the cracked part is not visible so as long as the fix works I dont really care how it looks. I was thinking of smearing them with some...- TrevorBarten
- Thread
- crack mix. dustcover glue hinges repair
- Replies: 4
- Forum: Turntables
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Looking for: Vintage Turntable Repair New Jersey
Hey guys! Hoping someone might be able to point me in the direction of an experienced tech in the vicinity of Randolph or Newark NJ. Thanks for your help! Cheers, Jeremy- ZeroFks
- Thread
- repair service technician turntable vintage
- Replies: 1
- Forum: General Audio Discussion
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Advent Laureate for free
Picked up a set of AV's for free. Definitely need some repair work. A couple of questions. A.) Are they worth repairing? B.) Any website recommendations for purchasing foam and parts? C.) Anything else I should replace/repair beyond the obvious while I have them apart? Pictures attached Thanks!- Adam.Holroyd
- Thread
- advent repair
- Replies: 28
- Forum: Speakers
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Vintage audio repair NW Ohio
Looking for reputable repair shop in NW Ohio or SE Michigan, specifically for mid-70’s Sony cassette deck. Any suggestions?- flyguy316
- Thread
- cassette repair
- Replies: 0
- Forum: Solid State
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Speaker Crossover Analysis
Is there a way to determine if a crossover is bad? That is, if the caps need replacing or something else? Is there a phone app I can use to read output or something? I don’t even know how this would be input or read but I remember in grad school that microphones can be self calibrating... -
Issue on a new (for me) AU-666
First of all hello and good morning everyone! i bought this amplifier a couple days ago in great condition and it really sounds amazing other than the fact that there is some extremely strange things going on inside. When no input is plugged in everything is dead silent, but the moment i plug...- Alexeifox
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- noise repair sansui sansui au-666
- Replies: 31
- Forum: Exclusively Sansui
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Is an MR74 worth repairing?
I got a really beat up MR74 and I'm wondering if it's worth repairing. It powers up. At first I was able to get AM radio reception, but while listening to it, the sound suddenly faded and now there's nothing. The local authorized repair place won't touch it, largely because they can't calibrate...- edwinh
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- mr74 repair
- Replies: 33
- Forum: McIntosh Audio
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SONY SQR 6650 Restoring the "Nicotine version"
Hi all.. >>>>Hold on, sit tight, don't hold your breath.... This is gonna be a longggggggg read.>>>> Got my Second SONY in beginning of April 2021. Bought it for € 85,-- ex shipment (€30,--) from Germany to the Netherlands. Never heard it play... and I did not touch it.. It was from a Guy who I...- VintageDutch
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- nicotine repair restoration sony sqr 6650 sqr-6650 vu meter
- Replies: 12
- Forum: Solid State
