Troubleshooting a Technics Equalizer with heavy distortion
Пікірлер: 45
@RandallDibble6 жыл бұрын
I have one of these units. IT's great to see on the inside. My unit works great !
@12voltvids6 жыл бұрын
The fun part will be the wait for the part. I found a bunch of them, but they all appear to be on the other side of the planet, in the UK of all places.
@zx8401ztv6 жыл бұрын
Now that does look empty, and how cute does that tiny transformer look. I first thought the input/output coupling caps were bad, causes hell with bias. Hopefully the chip isn't "Unobtainium", never heard of that chip before. it's really nice when they lay the parts out in a symetrical way, like the riaa eq pre amplifiers.
@pitsnake6 жыл бұрын
Hi Dave, You can replace those opamps TA75559 with UPC4570C which are much quieter and if you dont find it in SIP9, just try to build a mod circuit that uses sip-8 to dip-8, they sell pcbs on ebay for that purpose and dont worry about VEE, it should be moved from pin 5 (old) to pin 4.
@mochs38696 жыл бұрын
Yeah, what he said, lol (what'd he say??)
@glenngoodale17096 жыл бұрын
Your videos inspire me, thankyou for sharing
@jhunc27762 жыл бұрын
Is svd1s2076at still available in the market? What is the replacement for this diode? Can I use IN4148 diode as a replacement? Thanks for replying....
@vibra646 жыл бұрын
I love the smell of solder!!! You are right. None of this fancy solder crap.
@12voltvids6 жыл бұрын
Then there is the small of burning skin when you slip with the iron. Oh yes, it hurts too!
@MrHBSoftware6 жыл бұрын
i clean the tip of the iron on my jeans now thats badass :) . have you tried to blow solder out of the pins by heating and blowing into it with a straw?it works amazingly well..just have to clean the mess afterwards
@12voltvids6 жыл бұрын
I used to clean the soldering iron using either my bare fingers. Now THAT is bad ass. I will do it on a future one to watch people cringe. Why use a straw to blow solder out, Get get close enough to kiss the board and let fly. I am sure I have some shots of me doing just that, but they got edited out.
@abc-ni9uw4 жыл бұрын
Sg-9800 hard to find like sa9800 stereo amplifier
@johnohara545 жыл бұрын
Haven’t watched the end of video yet but with those dc reference voltages you got, I would bet some pin-to-pin resistance readings will show some shorts in this IC. Real quickly, pin1 and 2 referenced to 7 and 8, 3 and4 , 5 and 6 ,, then 2 and 3 simultaneously to 2 pins will find a hard short real quick. Back to video to see if I am right.
@victorcoss26006 жыл бұрын
Awesome stuff, curious what do you think caused that IC to go bad?
@12voltvids6 жыл бұрын
Could be anything. Overloaded input possibly, or it just failed.
@jp0407596 жыл бұрын
What brand of solder wick did you use here? It sure does work well and fast. I need to get some good stuff. Thanx in advance.
@finscreenname4 жыл бұрын
Did you ever finish this? If anyone has parts to this I need a face plate. Everything is fading on the front of mine.
@quasarhi6 жыл бұрын
got one of those ! thanks for posting !
@JIMO4156 жыл бұрын
Hello, that EQ looks similar to mine but without the VFD spectrum analyzer. Also, I appreciate your teaching format. You have a great talent. Just curious, can you share with me how you get your schematics for your various repairs. Is it just a google search or do you have a source? Thank you.
@victorcoss26006 жыл бұрын
Google or something like HiFi Engine for audio equipment.
@12voltvids6 жыл бұрын
That one came from hi fi engine. I just do a google.
@crashbandicoot4everr6 жыл бұрын
JIMO415 freeservicemanuals.info is a nice website too.
@Luke-san6 жыл бұрын
I love those displays ... seems when I was younger I would buy devices for those things.
@JIMO4156 жыл бұрын
thank you!
@God-CDXX6 жыл бұрын
I built 2 small mod boards to use TL072CP much quieter and the chips are only $2 for 10 pcs on EBay
@stphinkle6 жыл бұрын
It appears that that IC was originally made by Toshiba and is a discontinued part and appears to be quite rare. Maybe you could find a current production one with similar specs that would work.
@12voltvids6 жыл бұрын
Stephen Hinkle Lots available out of the UK. Under 10 bucks.
@stphinkle6 жыл бұрын
12voltvids that is good news.
@Luke-san6 жыл бұрын
Why not use like a TL072 or so. Plenty of those types in my drawer and cost next to nothing. Bet you won't hear the difference and if you hear the difference use for both channels. Some small wires and a bit of hot glue and ready to go.
@chris76625 жыл бұрын
I'm a carpenter...what the heck is an IC?
@ronwaasdorp45815 жыл бұрын
Where do you get the schematics?
@12voltvids5 жыл бұрын
Usually hifi engine.
@Synthematix6 жыл бұрын
Holy shit, look at that bare live wiring about 5mm away from the frame, now thats fucking bad. id have to heatshrink that at least
@12voltvids6 жыл бұрын
What bare live wire? The one on the switch or the one on the convenience outlet? They are mounted to the cabinet, and 120 v is not going to jump that space. That is how they built them.
@Synthematix6 жыл бұрын
Really? wow suppose this was built before all the health and safety we have today
@12voltvids6 жыл бұрын
Synthematix We used to have hot chassis remember. That would never fly today.
@God-CDXX6 жыл бұрын
I like hot chassis amps much liter I am building one as we speak 4 25BQ6 1 12at7 the 12at7 heater is the mane cathode resistor for the 25BQ6 output tubes
@God-CDXX6 жыл бұрын
when I first opened mine I exited half this much
@God-CDXX6 жыл бұрын
( 10PCS IC TL072CP ) search this on EBay
@craigstaggs85976 жыл бұрын
FFs Technics not tequniques !! , do you say Panasonic or Panasonique ?.....
@oldguy8177able2 жыл бұрын
refloat it
@markanderson3506 жыл бұрын
Kinda boring, not much else can fail. You don't see EQs much anymore.
@12voltvids6 жыл бұрын
Mark Anderson There is lots that can fail. Regulators can go capacitors can go bad and the front board with all the pots has a hand full of parts that can go bad. In this case it was a op amp that died.
@markanderson3506 жыл бұрын
yes well I guess you are right. Just in general, these are easy to troubleshoot.