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- เผยแพร่เมื่อ 29 ส.ค. 2024
- Need tools? Here's a video showing what I use (with links!): • Must-Have Tools For Wo...
The Kenwood KR-5010 is a late 70s stereo receiver that happens to use STK-0050 darlington power packs for the power amplifier section.
Link to STK-0050 with discrete components: audiokarma.org... - วิทยาศาสตร์และเทคโนโลยี
This Kenwood is unbelievably, incredibly beautiful. I love this gorgeous, classic design.
Xraytonyb to the rescue. :) I can't wait to see how the two options play out.
Thanks for showing how to clean the tuner pack, because I need to do that on a Harman Kardon 430 Twin I bought. Was afraid to try that method.
Can’t wait to see the next video on this repair…. Thank you….
Good work. Bringing a dead Kenwood to life. I enjoy watching your repair videos. Look forward to more.
Can't wait for part 2
Looking forward for the next video, great work.
Done right those sanyo STK voltage amplifiers can sound absoulutely beautiful, they died because manufacturers never used adequate cooling.
Had an early 90's sansui with a 100wpc STK chip. Had active cooling on the heatsink so didn't run too hot at full tilt. Had to bypass the protection relays as they were too sensitive. Played fine for years but the power transformer eventually went open during a extended full crank session. Right in the middle of a roudy college party, lots of boo's. Party goers were not pleased!
Cool. Xraytonyb has lots of great info in his Fisher RS 2010 series about those modules. Can't wait to see your take on this repair.
Everyone should own a portable air compressor to blow out your equipment. Also a fuse holder for hard to hold and place fuses. A two inch cheap paint brush helps also. Nice how to video.
It-tronics in Germany have most all STK in superb quality ...thanks
Looking forward to more!
That was my first amp & I wish I never got rid of it, one of the best sounding recievers I've ever owned better than my Marantz from the same Era
Wow this is a good one... I can't wait to see if the discreet board , populated, fits in that spot. It's going to be a cool receiver when you're done, the meters and face are good looking. Thanks for picking the discrete challenge. Cool !!
I have a 4010 that I bought on Craigslist for $20. Had to put a triac across the rotary speaker/power switch. It had nearly eaten itself alive from all the arcing but it works like a charm now. These are somewhat underrated/undervalued in my opinion.
My kenwood kr 6160 has "no low end" on the right channel after it warms up. Im guessing it's an out transistor on the heat sink but my knowledge is limited with electronics. Eventually ill find a tech or figure it out. Thanks for another great video!
STK modules! How can I wait? I must wait. Dang.
Nice, look forward to the update videos.
I did one in March. The little brother. The input selector wafer was broken in half and required extensive repair.
The trick to ebay powerpack replacements is to NOT bias them. If you try to apply bias as per the service manual, they tend to blow up instantly.
I bought some cheap STK modules from Aliexpress and they were legit but used pulls. I did get one bad one in the pulls. it seems somebody is pulling these modules from e-scrap, cleaning them up and selling them.
Hey, they did work and I couldn't blow them up
Interesting! FM alignment will be a good vid.
Main reason why I am interested in a vintage receiver is the Loudness function. Can’t play music loud enough to enjoy it. Loudness and the right speakers should do the job…
See ya next time then...👍👍
I’ve gone the discrete component PCB many times when replacing these STK packages, enough so that I purchased 100 boards.
If you already bought the components that’s great, but I know that some of the components like the TO-220 and outputs are getting harder to get. So if you need any of the components to complete the boards just reach out.
Don’t know if you’ll read this but those Darlington power packs are replaceable they do you can get those replaced or you can actually get a kit that replaces them with two transistors or is it three transitions? I can’t remember but anyway it’s a modified kit that would fit in there. It’s whatever you choose. I see both, but those Darlington power packslook online I found them some on eBay but I’ve also found a lot of over in China which a lot of people don’t like to order stuff from China which I get it but when you can find it it’s not as hard as you think
Thanks. From where are you buying the PCB replacement for the STK chips ?
Could you compare a few kenwood receiver models with pioneer and marantz receivers from that era in terms of sound quality? A friend has a KR-7600, but the sound is somehow more closed to me than the Pioneer and Marantz receivers. With these others, the middle and high tones are heard better than with Kenwood. Maybe he's ready for a refresh, too..
It is best to do your own comparisons.
That said, I would rank the popular receiver brands of the time thus, considering only their sound character:
Harman/Kardon, Yamaha, Sansui, Marantz, Pioneer, Sony, Kenwood, Sherwood, JVC.
Some may want to switch these around, which is OK with me because everyone has their own preferences,
and there were other brands that were quite good performers but not as well known.
Thanks, do you sell any of these after you repair them?
can you add a link to the discrete design and pcb, pls?
Xraytonyb has a series on his channel. It's worth watching all 5 parts for details. Fisher RS 2010 Parts 1-5. There are links for the parts lists on Audio Karma but I think some of them are obsolete too. Tony did a great job figuring it out.
Yes. I'll put it here as well: audiokarma.org/forums/index.php?threads/stk-0050-replacement-for-sx-780-and-others.721181/
That is a very poor title of choice which does not do any justice for the content of these videos.
1st 🎉
NTE makes a replacement for the STK that works great no counterfeit
I don't know for certain, but I suspect those ECG/NTE parts are remaining old stock rather than current production,
and they are probably Sanyo originals with different labelling.