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I'm sitting here looking at displays from some vintage units and considering which are the most pleasing displays. I should start reducing the inventory, and I'm thinking about what can go, a nice display is one consideration. I have in my view: Pioneer SX-939 Sansui Eight Deluxe...

FM just suddenly stopped working on this unit. I've read through other posts with similar issues, I plan to clean switches. Because it was working and then suddenly stopped, I doubt that it's switches. I'm just getting started on this. I checked voltages at the IF amplifiers, they are within 1...

I'm curious about how often techs find new transistors that are bad, and if they test before installing. I recently finished a repair on an integrated amp, I replaced all transistors on the power amp board. One was either bad going in, or went bad shortly after. I don't think I did anything to...

I put in some time on this amp again this evening, it's been kicking my butt on and off for years. I tried taking a different approach this time. It seems I can leave the unit on indefinitely as long as it's on a dim bulb tester, so I started checking voltage at different points. I start seeing...

Hello, I've got an older car stereo that I would like to repair, but will need help. Audiokarma has been a great resource in fixing home stereo gear. I am hoping someone could point me to a resource for car stereo gear. Thank you.

Hello, I've been working on this KA-3500 off and on for years, mostly trying to find a short. I tried a new tactic tonight, I'm hoping someone who understands circuits much better than I do can help interpret the findings. I attached 30 VAC to the power plug, powered on the unit, and started...

Found these speakers at my new work location in remote Alaska, figured I might as well put them to work. Interesting the things you can find in the most unexpected places. With a good source hooked up they do a good job of filling the hangar.

Hello, Not sure if this post fits here, please let me know if I should post in another forum. I am trying to use a tablet to play music through a mixer / amp to a receiver, and I get poor sound quality. I am using VLC media player. I have an MP3 player that works well, but I neglected to bring...

Hello, The tape deck followed me home from the local thrift store yesterday. I got a chance to look at it today, It needs belts. I replaced one of the belts with a rubber band to troubleshoot and got it going. I haven't played with tape decks much at all so I'm looking for advice on servicing...

I could use some help with how to find a short. I believe I have narrowed it down to the power supply or the amplifier by removing pins 17 & 18 from the preamp. Previously I found 3 bad output transistors and replaced all 4. I then powered up on a DBT w/ 60W bulb and it indicated a short. I...

I replaced the shorted STK-0050, Q10, Q16, and R46. I powered up on a DBT and still had a short. I de-soldered the power feed to the power amp board and powered up, no short, so it's definitely on the power amp board. If I turn the unit on to "phones" there is no short and the headphone jack...

I'm working on a Harman Kardon TU615 tuner.It started out as a power problem - no dial lights. I got that fixed but now when playing it breaks the fm signal very briefly, sometimes often, sometimes just once in a while. It seems to do it more when I first turn it on, and it seems to be worse on...

I wold like to say thank you to the members of this forum for their generous assistance. My electronics skills are minimal but I like the vintage equipment, I like taking something that doesn't work and making it work again, and I like learning as I work on the gear. I've reached out for help a...

I've searched the site and found similar problems but not quite like mine. When I turn the receiver off I get a pop from the left speaker and then a slowly fading buzz from both speakers. I also get a pop at power on, but much weaker than power off. I just started using this receiver. After I...

I've got an SX-939 that had intermittent FM tuning problems, it eventually went dead. I used to be able to touch the HA1201 and get the signal back, not any more. I checked voltages, I'm not sure what I should get but things looked normal except for pin 6 (Vcc). I assumed I should have a supply...

Finally getting started on this receiver. It's been a while since I got it and did the initial look but I'm pretty sure I remember that there were 2 blown fuses, the right power pack was bad (pins 8 & 9 shorted) and R46 is obviously burnt. I'm still pretty new at this so I'm looking for some...

I picked up an amplifier yesterday. It looks like there was more than one A-70, this is the early 80's stereo amplifier model. Anyway, no output, no peak power indication, no sound from headphone jack. I haven't done much with it yet. I have done a visual inspection with the cover off, no...

I recently got this 2215B. One channel was weak and distorted, I'm almost positive it was the right channel. I swapped the output transistors side to side, the problem moved to the other channel. I didn't see any evidence of burned components, and the bad channel sounded good (I thought) with...

Anyone have advice on where to get surrounds for Blue Burhoes? There are a couple of advertisers on ebay that claim to have the "correct" surrounds for the Burhoes, one is audiodogs out of Canada, the other is midwestspeaker. I have been using simply speaker surrounds but one of the advertisers...

Looking for info on this cassette deck. I have no experience with repairing / servicing tape decks. I came across this one recently, the guy I got it from said it just needs belts. I opened it up and one belt is melted to the motor shaft. When I turn on power the motor starts spinning. I can...

I'm looking for information on dial pointer bulbs for an SX-990. I replaced bulbs in 3 different units, put in 40 ma bulbs, and they are pretty dim. I have two of the lamps that I removed, I measured the diameter of them with dial calipers, I come up with .2 inches, which converts to 5mm...

I just acquired a KA-3500, the previous owner said that it keeps blowing fuses. I took the cover off and looked around, there has been something spilled in it at least once. I did a little cleaning so I could see the components better, I don't see anything that looks burnt. I used an ohmmeter...

I have a unit I'm thinking about putting some new IC power packs in temporarily to check it out and see if I want to do the discreet component mod to it. Has anyone found that there are better, or least crappy new STK-0050's? Thanks, Brett

I have a newly acquired 2215B that has a channel problem. I'm new at working on stereos, I would like to learn and I know a little about electronics, but still really a novice. IIRC the right channel was weak and quite distorted the first time I powered it up, I cleaned the switches and pots...

Hello, Looking for RS2004A parts at a reasonable cost. I have a unit that is cosmetically decent, but it has a shorted STK-0500, is missing the antenna, and a couple of equalizer knobs are not the correct ones. I like the looks of the unit and would like to get it working but I don't want to put...