Minimal Tools and No Schematics - Kenwood KR-710 Stereo Receiver

[@isoguy.]

In an effort to satisfy viewers with attention deficit a lot of creaters exclude the "how to", or explaining the logic behind the methodology being adopted. I'm addicted to your vids because you take the time to explain. Awesome content and thank you for taking the time to make such detailed explanatory vids.

[@morrisonAV]

Tony, this is the kind of video I WISH I had found when I started into this fun hobby. Many, many thanks for doing this in the manner you did. The one tool you left out of your plastic box was the manual you used to find the substitute output devices. Since most beginners will not have this info, it would have been great to see what web page(s) you'd use to find these subs.

[@johncunningham5435]

I think adding the additional protection, bias and zero adjust would be a nice touch to conclude the repair, (great video)

[@jamiestarr1022]

Tony: I really enjoyed this video. It was geared towards a person that may not have formal training but is trying to learn the hobby. I really don't "understand" what I am seeing when I look at a schematic. This was a really great top to bottom, practical, and informative video for someone like me. Great job. Thank you.

[@vcp93]

Seeing the speaker protection relay mod would be great. I vote "Keep Modifying" 👽👍

[@jefftobin4034]

Two thumbs up on using a simplified approach to this repair. Adding the speaker protect in a follow-up video would be interesting. I've considered doing this to a receiver I have and would love to see your approach.

[@afzaalkhan.m]

Always very well narrated, concise explanations of faults and rectification. thank you

[@6StringPassion.]

PLEASE DO COMPLETE THIS! Thanks.

[@petermetro4686]

Great video, go for the follow up and speaker protection. The minimalist testing approach should be used on more videos or offer substitute (less expensive ) diagnostic equipment choices if possible for those who troubleshoot without being in a test equipment cave. Some people don't have the means to return the equipment to factory specs and go full bore professional for a hobby. Just happy to repair and return to working condition. Well Done !

[@tomhague1162]

Just a quick comment about your dim bulb tester. Unless I missed something, the white (neutral connection) to your bulb holder is connected to the plug side of the cord. The white wire is connected internally to the shell of the lamp holder potentially exposing you to full line voltage with the switch on and no lamp in the holder. Connecting the black wire to the hot side of the line places power on the centre pin of the lamp holder and the shell on the neutral side of the completed circuit when something is plugged in to the cord. This would greatly reduce the possibility of accidental contact with power. Great instructional video.

[@esci8978]

Nice video Tony… Would be great to see a follow up on setting it up as well as another video adding a speaker protect circuit.. Mainly to get a better understanding of how a speaker protect circuit works… :)

[@marka1986]

Good idea on replacing outputs on the other side. The originals seem just good enough for the job.

[@danielsaturnino5715]

Thank you for taking the time to do this video. Pretty simple and cool pointers for a beginner.

[@petejacob2513]

I'd love to see a protection circuit added. Great video as ever Tony. I'd also love if one day you got hold of a Quad 405, I kinda understand how they work, but your explanations always make things so clear!

[@craigm.9070]

Thank you Tony! Very interesting troubleshooting trip; straight forward go, no go, component tests.

[@johnnytoobad7785]

Always enjoy the "minimalist analysis" and repair.

[@dimitrissisikis4920]

Hi Tony .For shure if we had a Teacher at electronics School aproaching and covering the topics with such a clear detail ,we should be even better on what we are doing. All of your videos are perfect , I are really appreciate the knowledge that you spread.From every video I putting something in my bag and as I using it at work makes me better with more confidence.

[@cremvustila]

This was great to watch, I'm always learning something new from your videos. And yes, I'd like to see a follow-up if you have the time and will to do it! Thumbs up anyway!

[@davidbailey6350]

Absolutely on the the follow up…. Great video Tony. Thank You.

[@benlopez4788]

Great video. I enjoyed watching you troubleshoot and repair with minimal tools. Thanks

[@tylernelson4488]

Would love to see a follow up video on this as well. Especially the speaker protect circuit addition. Thanks for all your videos!

[@lotharschneck7381]

Hi Tony, what a Great Video - I learned a lot. And I would appreciate to see a video on the protection circuit as well as demonstrate to blocking capacitor to protect the speakers. Thanks in advance

[@RectifiedMetals]

Yes I would like to see a speaker protection circuit added with the same “minimal” philosophy. Welll done on this one.

[@geoffreykeane4072]

Thanks Tony. I’d like to see the pros and cons of just adding a series capacitor as a speaker protect when you add your protect circuit.

[@6StringPassion.]

This is GOLD!

[@nickfolino8228]

You're very generous with your description. That's not a strange layout or odd design, that's just downright bizarre!

[@markross5410]

Always love your videos, I learn something every time ! Thanks for sharing your knowledge with us........

[@jdmccorful]

Yes, to all three questions! You have a wonderful way of guiding through the maze of repairs. Thanks for your time and skills. Repetition is the key to skills!Enjoyed watching.

[@fiddlix]

Excellent tutorial…even for an old dog 🐕 like me.

[@dirusnightwolf]

Thank you Tony for these wonderful videos. Getting me threw my hospital stay. The good news it that I have a nice kennwood from mid 70s waiting at home for restoration. Take care. ::)

[@collinwood60]

Great video Tony. Perfect for a newbie like me trying to learn this stuff. I love that you are using minimal tools and equipment to do this. An oscilloscope would be nice someday, but need to get other equipment first. Plus I’d have to learn to use the oscilloscope too! Please do a follow up for setting the bias and DC offset. It would be great to see you add an aftermarket speaker protect switch as well. Thanks for all you do.

[@jeditoto3441]

Great video for beginners…. But I am not a beginner 😀 Watched in fast forward

[@MrDirect23]

Thank you Tony for being you! In all your videos I take away something every time I learn just watching and listening to you I appreciate you ! Thank you for your detailed instruction and choice of words are so clear to understand. I’ve been in the automotive industry technician many years and just recently I’ve gotten the audio vintage bug in repairing the old pioneers. Sx series Thank you for these informative amazin videos. I love these beginning type videos. As I am learning every day. 🙏🏻

[@Theoobovril]

It would be interesting to see you continue on with this receiver, Tony.

[@rolfts5762]

( Concur, and perhaps with the schematics also,.. Tony's pointing&talk on the 'wiring-paper' is also very enjoyable.)

[@schorse1000]

The Pioneer TX-7800 also has the touch sensitive knob for the PLL.

[@RobsFixitShop]

I worked on one of these stereos and (also made a video) and the left side emitter resistors had broken solder joints. Actually a number of broken solder joints in that area. Also the FM tuner unlocks when you touch the tuner button and then locks when you release. Kind of a cool feature but confusing if you don't know what it is doing.

[@allensheldon90]

I would be very interested to see the addition of a speaker protect circuit. Thank you for the videos.

[@laurencedekeyzer861]

Great information, would certainly like to see any further video regarding the Kenwood

[@Joe-to6xg]

Yes, please tony with a follow up video with the same theme of bare minimal tools.

[@billmcdonald2436]

I love alignment videos. I say go ahead with the follow up

[@MickeyMishra]

Some people listen to waterfalls to fall asleep. I watch this. I'm sure there is something weird about that. But maybe its just that you feel better around confident smart people. And its nice knowing that things are being fixed. Maybe that's it? Maybe fixing something that is broken reaches you on some level in your mind or soul that adheres to the masculine mindset that seeing a piece of gear operating again calms you. Or even listening to the audio of the repair? Either way. It's a joy to watch these videos. It so much better then the fast paced in your face tactics that are used by other channels in order to gain viewership by the Goldfish attention span crew/demographic. it's like a total and complete 360-degree change from what we are so used to in today's Modern Advertising driven media Productions. maybe it's just me but if I had a bar/ tavern / etc? This is the kind of content that I would be playing in the background. it does make me wonder if there are any restaurants with that kind of theme for electronic repair? might be a good way to fund right to repair initiatives?

[@vics8106]

Great Video!!! Your instruction is A+A+A+ Thank You!!!

[@skooterfd]

Yes, let's do a full restoration video! So many other channels skip a lot of the steps needed!

[@isoguy.]

So true, in an effort to satisfy viewers with attention deficit a lot of creaters exclude the "how to", or explaining the logic behind the methodology being adopted. I'm addicted to Tony's vids because he takes the time to explain.

[@bob1842ra]

Thank you for another interesting video. I would love to see you installing a protection circuit.

[@Bluelagoonstudios]

This amp is very neat, I've seen worse. I have also seen guys not being very realistic, I had a Kenwood KR8000 on the bench, that was blown up in the rain, while playing, big chunks of the PCB were carbonized from heat, it took the whole supply chain with it, so they brought it to a guy, who wanted to repair the thing. Then they brought it to me. These are amps that are not worth the time and the money to spend on. I told the owner, this was a dead end for the amp, which was a decent looking one on the outside. Love your work, please keep posting the good learning videos. Btw, great work, and this is for me personal, the biggest reward.

[@williamsquires3070]

That being said people, if you absolutely insist on hooking your good speakers to an amp whose provenance you know not, put a capacitor in series with one speaker lead (it doesn’t matter which.) A 0.1 uF ceramic disk cap will work just fine for testing if the channel is working. You can also hook two electrolytic caps of the same rating in inverse-series (i.e. hook either the two ‘-‘ leads, or the two ‘+’ leads together.) They also make non-polarized electrolytic caps, but they’re a bit more expensive, and they’re not that common.

[@raywilson9450]

Bought one of these at a flea market today…ten bucks. Awesome having your tutorial before I even put the unit on the bench.

[@bobbyy8711]

Thank you Tony for sharing this kind of approach, really really helpful. Greetings from the Philippines. (Looking forward to your follow up video).

[@etschirm]

Wonderful video, Tony! I would like to see the protection circuit design and installation as well. I enjoy the in depth, friendly, and relaxed pace of both your, & Paul Carlson's videos. Please keep doing what you are doing!

[@lawrencechristiansen9857]

Great video! I still have this model that I bought used in 1985 and use everyday in my shop.

[@aramstudio2891]

Very informative video especially for the beginners

[@andymouse]

Smashing little tutorial...cheers.

[@6StringPassion.]

Tony - I have the same little transistor checker you have. Mine will test capacitors and it even shows ESR on the display as well.

[@jeanpierre3193]

Good evening,your video are not too long!,you alway specify the important point,even if y do not understand English very well ( i am French) Best Regards Jean-Pierre.

[@rolfts5762]

(..ooh, one newer know Tony, the 'white-noise' might too become copyrighted in near future..) ,,Thanks for great video.

[@radio-ged4626]

Really enjoying these back to basics videos, so many things we do automatically that I wouldn't remember to mention if I were explaining. I would like to see you build the speaker protection circuit. This would be interesting to see. While I have spent many years fault finding and repairing electronic equipment, I've not done very many amplifiers and have never built a speaker protection circuit.

[@PeterMilanovski]

For me, it doesn't matter if it's mine or for a customer, I replace both transistors! I also perform a visual check of all capacitors then do a quick in-circuit ESR test and pull any capacitors that look suspicious and compare to new capacitors out of circuit. I have seen many other people who won't put in the extra time and only replace the broken part's without finding what caused them to break in the first place and I feel that this is the wrong attitude, this is the reason why repair shops get a bad name! You get your equipment home and it works for a while and dies again.... I have been on the receiving end and know what it feels like to have spent money on having someone fix something that brings you joy only to end up unhappy again! It's frustrating! That's why I try to be as thorough as possible, when you do it enough times, it becomes routine and it doesn't take much longer to do a better job and therefore doesn't cost that much more either... Although, on my own equipment, I will check every capacitor out of circuit for capacity, DC leakage and ESR but generally replace all with a higher voltage rating for a longer service life because modern capacitors are rated much closer to their printed voltage rating than the older ones.... Tony, I noticed that you have the Japanese solder sucker which comes with a silicone rubber tip on it, you should get yourself a silicone rubber tip for your other solder sucker also! It saves the tip that it originally came with and the beauty of the silicon rubber tip is that you can put it directly over the soldering iron and joint to get a good vacuum seal without melting anything! The silicone rubber tip is rated for high temperature and is relatively easy and cheap to replace should you ever need to...

[@santospoland]

I would love to see a follow-up. Very good process. Thank you!

[@rjonzun5828]

This is awesome. Thank you so much.

[@jonka1]

For speaker protection I fitted fast blow fuses in each of my shop speakers. I learned the hard way that amplifiers can have their own ideas about if and when they apply full rail voltage to the speaker terminals.

[@dhpbear2]

Relatively 'shiny' solder connections are 'been-worked-on' alerts!

[@greggaieck4808]

Xraytonyb your utube videos are awesome

[@brucebuckeye]

Good stuff! Thank you sir

[@giir3211]

Thank you. Great, as always. Your videos have great value to me.

[@adalbertus777]

Thanks for the video Tony. Great as always which is something you got us used to with every one posted here. BTW after watching it I've looked at the schematic and think this unit has trimpots both for bias and DC offset adjustements (VR45, VR46?) Greetings from Poland

[@JoseJimenez-vu4ip]

Awesome video thanks

[@overbuiltautomotive1299]

cool video minimalist repair deal .Hey Tony making a add on board for that no longer made chip in phono stage would be cool build video .if its not already done or may be still a great idea. God bless

[@DaveMcAnulty]

#1 trick I learned as a PC tech. Remove cover, flip over and SHAKE it! You will be amazed how often an "extra" screw or some other agent of destruction will come flying out!

[@santospoland]

Ray Gianelli who has his own KZbin channel that you should definitely check it out, mentioned your channel so I stopped by. I am starting off with electronics. Right now I am at the learning stage so lots of studying and reading on my own. I don't have all the equipment Ray has so I can't yet perform some of his steps. My limited toolset and stage that I am at should fit this video's goal nicely so I look forward to watching and seeing what I can pick up. Thanks for considering that part of your audience!

[@questionmark9684]

Hi Tony, Neat! Thank you. It would be great to see you implement a speaker project circuit. Cheers, Mark

[@janicehopkins4432]

And a speaker rebuild!

[@K1ZEK]

Nice video, basic BUT very nice to sit through. 73 de Leo.

[@nabman_]

After the suction action when you press the suction pen to reload it, remember to do so away from the bench so conductive debris doesn't fall on circuitry causing shorts.

[@willievivanco1]

Hi,and thanks for the video tony i would like to see the follow up video but of course its your call and i know you have the answer

[@justicelut]

Thanks Tony, very interesting!

[@sonnylou8087]

Yes please install a speaker protection, thank you.

[@andersthorsell4923]

Thank you for the instructive video.

[@Viewer19]

Incandescent bulbs are getting harder yo find so stock a few in different wattages for your dim bulb kit.

[@xraytonyb]

A good place to find them is electrical supply stores. They quite often still sell replacement traffic light bulbs. They are very durable and come in 93, 118 and several other wattages.

[@greggaieck4808]

Xraytonyb your vintage Kenwood streo receiver is cool

[@harryshector]

I would like tosee the adjustment and adition of the protection circuit.

[@ivanhoe6366]

The most important tool is YOUR brain, with all the experience it holds.

[@afnDavid]

Do those old Japanese electronics have the NOT-phillips (JIS) screws in them?. Where you need to have special shaped screwdriver tips... Else you strip out the screwheads.

[@rolfts5762]

,,Thinking, where could one buy these format screwdrivers? ,,Thanks for mentioning David.. Here also from time to time encountering these rare-standard screwHeads.

[@ofiroman123]

Excellent video, thanks

[@zx8401ztv]

Oh no, What a mistake you made. No mug of coffee to sip and keep the brain lubricated :-D That 1000uF d.c blocking condenser had the wrong polarity lol.

[@mikepxg6406]

Hi Tony. was the 330 ohm resistor a fuse resistor maybe. ?

[@gilsharon6724]

Can you recommend a brand of quality silicone pads? How do the sil ones compare to good ol' mica + paste in terms of heat conductance?

[@Cleofizoid]

You keep saying, "and you can buy them online". 🤣

[@victorammirati8151]

yes , do a follow up video .

[@nancybrummer5451]

yes,please

[@1982travm]

Would love a follow up :)

[@midmodaudio6576]

Thank you for another informative video. Is the SCOTT LK-60 Integrated Amplifier still in the works? Looking forward to it.

[@xraytonyb]

It's on the list ;)

[@midmodaudio6576]

@@xraytonyb thank you, looking forward to it. I've had one in storage for years waiting for some inspiration to restore it properly

[@t1d100]

Excellent!

[@jackovermyer3043]

Great information, would like to get a hold of one of those transistor replacement books. Do you know where I might find one. I have google searched but no leads. Thanks and keep going with vids!!

[@tiberiusbrazas1707]

how did you clean the balance control knob???? I have this same model, I bought it at Circuit City in Kalamazoo michigan in 1980 and it has traveled with me to virginia and still works as of today....except that the control knobs are going or dirty.

[@barryf5479]

Curious why you don't take the unit outdoors and blow the dust off with compressed air. I used to work as a bench tech. when in college and that's how we cleaned dusty TVs and radios. Yes, theoretically, non-ionized air could have a static charge but we never had any problem with it. Beats trying to use a brush which would move around some of the dust and maybe some component leads in an unlikely situation.

[@frankgeeraerts6243]

Hi Tony , .................On the schematic you orientated the >DC protective capacitor on the + LS output -/+ ...?

[@sonnylou8087]

I have five of those speaker protection boards and if you would like I can donate one for a video for you so that you can install one of the speaker protections if you’re interested. I would need an address to send it to that’s all.

[@xraytonyb]

Thank you for the generous offer, but I have several of them in stock as well. I really appreciate your generosity, though!

[@pablosaenz6541]

Hi Tony¡ please add the videos of the speaker protection circuit and the diode repalecement¡ we are really interested in such a video¡¡¡ please do the video¡!!!

[@terrykinch8248]

Do the follow up video.

[@RGD-Games]

That transistor would be extremely handy to own... What is it please?

[@crashoverride328]

Just a heads up - the service manual is available as a free download online.

[@dirtydon8661]

Believe me, he knows that.

[@ThinkinThoed]

Just a heads up, somebody didn't watch the video.. you know, like the part at 23:08 where he says he has the schematic but wants to see how far we get without it.. lol