I went to Army Basic Training over 30 years ago. Your new series of videos are triggering my PTSD. LOL
@altcountyemo2 ай бұрын
Excellent. It is hard to find a Fender circuit board amp WITHOUT those IC filter caps. A full cap replacement can get expensive, but for a musician who loves the amp and plans on keeping it, it is worth the investment.
@1Ma9iN8tive2 жыл бұрын
Honestly Sir. A master class. Simple. Logical. Obvious expertise born from years of experience. By Voltaires Bastards I’ll keep enjoying watching D-Lab for years to come … there’s something so satisfying about watching a master at his craft. Carry on sir.
@d-labelectronics2 жыл бұрын
Thank you my friend, Lots more in the Q
@Finom12 жыл бұрын
Terry, we love all the educational videos on your channel:) God Bless and protect you and your family:)
@davehunt57062 жыл бұрын
Keep them coming Terry and the subscribers will cone rolling in , if they want amp Knowledge this is the place to get it , Thank you
@869576 Жыл бұрын
Well, I stumbled upon this video and had the identical problem with my SS 60. I found C82 and C 83 both reading open. The remainder of the PS caps checked good but I replaced them along with an overheated resistor and bypass cap(out of tolerance) in the reverb circuit. No more oscillations! Thank you for your videos. My SS is sounding awesome again.
@blakesimpson99742 жыл бұрын
Great lesson and very interesting. Love the new direction and seeing D labs going full time.
@DaveGVideo2 жыл бұрын
Nice explanation and demonstration Terry! I’ve run into the motorboating problem several times. You hate to see folks shotgunning new tubes and reverb tanks when they’re chasing something like this. Thanks for the great video.
@firstchurch75432 жыл бұрын
Excellent presentation once again, Terry. Keep up the good work!
@edwardhannigan63242 жыл бұрын
Love the basic training videos Terry..So much info and tech tips..Look forward to the next, and I am always singing your praises to friends etc. in the hope they take a look and subscribe..! Take care..Ed..uk..😁
@theguitaramptech Жыл бұрын
Hiya Ed! Terry is a cool guy.
@JivRey2 жыл бұрын
Stumbled on your channel with that Proco Rat video and ended up watching a few vids about amp repair and I love it. I've been trying to debug and fix my amps and my pedals myself over the years and while I'm not a pro, I'm definitely getting better at it. These kind of videos are very insightful, and I thank you for that.
@davidwoodruff22452 жыл бұрын
I'm a new watcher and I'm really enjoying your work sir. All the amp repairs are great. Maybe walk us through one sometime without time lapsing. Very Into it brother. Rock on.
@666gelinas19 ай бұрын
I've been a player for over 40 Years. It's time to add amp build and repair knowledge. Your videos are great! I haven't seen them all but have you created a video on how to create a "dummy load resistor" yet?
@weschilton2 жыл бұрын
Great video, Mr. D-lab! I have a friend who just bought a new Blue's Jr, and its already complaining about burning smells and weird sounds. I'm going to have him bring it over so I can take a look at those caps. I wouldn't be surprised to see them fail almost right away. The amp is probably severely over-biased too.
@Legnum6662 жыл бұрын
More of these basic training videos lease :) Much appreciated, cheers Louis
@dr.detroit15143 ай бұрын
Great stuff! I'm not into guitar amps per-se, but this is helping me with troubleshooting ideas for some stubborn radio & TV problems I have sitting up on shelfs collecting dust.
@tschupbach2 жыл бұрын
Great tip! I had a small combo amp (can't remember which, sorry) in my shop that had a feedback issue in reverb on only one guitar string. In this amp, the tank was mounted to the chassis. The fix ended up being isolating the tank with rubber grommets like Fender does.
@sandiesjoys97772 жыл бұрын
appreciate the info. this has helped greatly with my repairs. Thank you and I will tell other techs about your channel.
@fiddlix2 жыл бұрын
A most excellent tutorial. Thank you.
@JuanHoya2 ай бұрын
Just when mine started squealing, thanks Terry, appreciated 👍
@Mark-ry3ij2 жыл бұрын
Great video as usual Terry! ☺
@kengevers87382 жыл бұрын
Hmm, taught me something I didn't know. Thanks Terry for sharing 😀
@TheTrueVoiceOfReason2 жыл бұрын
Listening in the car, as soon as you said all controls have some affect in it, I said power supply. Couldn't see the scope at that point, so no clue what it looked like. What was it, 60 or 120 Hz?
@hnatyshynАй бұрын
Same question here. Though I doubt it would be 60 or 120 Hz, because at some point, you can see the frequency shifting on the scope.
@preiter202 жыл бұрын
Great troubleshooting Terry! How is Bob Mondavi handling the demotion now that Fred is here?
@CC-te5zf2 жыл бұрын
Great video! Learned a ton!
@tomk1tl394 ай бұрын
Tks for this video . . . have similar issue with my '65 Fender Princeton RI. . . replaced tubes and tank . . . I was going to change out the filter caps anyway which I should have done in the first place as the amp prolly had those IEC caps . . . will use F&T which I use all the time anyway 😎👍
@oimate42012 жыл бұрын
Very interesting! Thank you for going through this tutorial. Very clear and informative. Thank you, Terry!
@scottohta21922 жыл бұрын
Hey Terry, Great job! Quick question, to change the caps would you use your Jhook method or would you pull the pc board out to solder the caps in. I can really see why many engineers prefer point to point wiring vs pc board. Thanks Terry.
@sandiesjoys97772 жыл бұрын
this would depend on what the situation is. if you have to spend more time that should be charged but the customer is on a budget, then it may be ok to j hook. But, it is always better to solder the caps to the board. Pc board components are a pain. Especially with a bunch of wires connected to the board. other times you have to do it.
@scottohta21922 жыл бұрын
@@sandiesjoys9777 Thanks Terry!
@bluesman977 ай бұрын
Excellent training video.. Thank You have the same problem in a fender amp.
@alanmrichards2 жыл бұрын
Great explanation. Truly enjoyed this.
@juliochingaling58242 жыл бұрын
Another excellent video 💪😎. God bless 🙏
@jmormino54652 жыл бұрын
Another great one. Really useful tips. Thank you
@jeffalessi2 жыл бұрын
Terry & Fred, which soldering cartridge & tip do you use with your Unger Snawsosaurus ?
@junkyard1189 ай бұрын
USA Made! Must be good...Why don't shut the Illinois capacitor factory down? If they can't produce decent caps? Well then there be much less easy repairs to be done! Earning easy money with replacing them with F&T caps.....Of course the abominal amplifier constructions of these years will provide more income.....Keep up the very good work Uncle D.
@ilovemywah2 жыл бұрын
Awesome, I have the exact same issue, just got the SS 22.. I noticed the squeal when tilting the combo back slightly, also noticed it bleeding through to the other pots/EQ.. then found this video boom! Awesome I'll be opening it up later & take ur advice & replace those poor quality caps.. What manufacturer/Brand would you suggest?
@ovenilsson52872 жыл бұрын
Great training, hi from Sweden 👌
@richardnormoyle5292 Жыл бұрын
Great explanations, enjoying your teaching vids
@mikiegood2 жыл бұрын
Another great video. Thanks
@MadScientistGuitarLab2 жыл бұрын
Yes, I certainly could use more stuff like this. Look forward to what else Fink will drag in. 😀
@kenwhelan30035 ай бұрын
Nice job Fred another great one!!
@ali2ndmail2 жыл бұрын
Good bit of fault finding. Though I am not sure why the noise was a “squeal” rather than a “hum”.
@russellhltn13962 жыл бұрын
Hum is a lower frequency - typically from the AC mains. What's happening here is the power draw of finals or later stage driver is imposing a signal on the B+ due to the changing current draw. Without good caps, that "signal" gets back into the sensitive front end stage though the B+. This kind of feedback is high frequency. I'm actually a little surprised it's audible and not out at ultrasonic frequencies. The main filter caps take care of the hum from rectifying the AC power to DC (for the most part), but the later caps help keep the stages isolated from each other.
@ali2ndmail2 жыл бұрын
@@russellhltn1396 yes, I was surprised it was audible. I couldn't think how a cap in power supply would make an audible squeal. But I understood it wasn't the usual simple AC hum. As you say other oscillation issues are usually ultrasonic.
@santossilviodos2 жыл бұрын
Can polypropylene capacitors replace electrolytic capacitors with advantages? Thank you very much for sharing your experience with us.
@howardtaylor229 Жыл бұрын
Really good video EXCEPT you did not show how to connect the oscilloscope to the amp. You verbally mentioned it but I am new and it did not mean anything to me. Can you do a video on connecting the scope to the amp for various kinds of measurements that might be taken. Thanks.
@butchlauer2 жыл бұрын
Thanks Terry!
@123chooby2 жыл бұрын
Terry, can you describe the dummy load used for the scope in this scenario?
@voxpathfinder15r2 жыл бұрын
I like these new Fred videos
@BenState2 жыл бұрын
Good work mate.
@ross38182 жыл бұрын
The feedback starts with the DC riding on the B+ from a leaky filter cap, correct?
@theguitaramptech Жыл бұрын
Another great video, Terry
@dykeneuk2 жыл бұрын
Very helpful. Thanks
@infectionsman2 жыл бұрын
How nice of Fender to put those IC caps into their amps making sure that amp techs can pay rent!
@ericedelman2 жыл бұрын
Fantastic!
@jaredmann345211 ай бұрын
what Hz was that oscillation at
@bobc.56982 жыл бұрын
I ordered a late 70's early 80's Fender Pro Reverb, I'm waiting for it in the mail. Right around that time the amps went from a tube rectifier to a solid state rectifier. I called the guy at the guitar center and asked him to look and see what rectifier it had. He said that it had the tube slot but no tube. They played the amp and it worked. I'm wondering if this could be a transition amp. If it indeed does have the slot could I go back to a tube rectifier?
@MArk-yn4sp2 жыл бұрын
Hi, did you ever make a video about removing earth/ ground loop hum in vintage amps? I have no idea where to research this prob. Tx
@davidgregory89502 жыл бұрын
First thing to do is isolate the source of the hum. Is it AC noise being coupled from the 6.3 volt heater supply or is it a ground loop (rare) or a noisy tube or oxidised contacts on the input jacks or a bad ground or filter cap in one of the preamp stages or one of the 20 other possible sources for hum in a vintage amp.?? First thing is check the amp with nothing plugged into it and make sure it's not a cable or noise being brought into the amp. Still humming? Find the frequency of the hum. If it is AC being coupled into it from the heaters or rectifier switching noise it will be around 120hz. If you don't have a scope get one! Can't effectively troubleshoot without one! Or plug your guitar in and match the frequency with the hum if it is 120hz it is from the heater supply and is most likely a lead dress issue. So chopstick or move around your preamp wires with something non-conductive (chopstick will work). If you can change the hum by moving a wire you have isolated the source of the hum . Merlin Blencowe's site TheValveWizard has an excellent and extensive article on grounding. So does Rob Robinette's website. Watch Terry here on D-lab. He has tons of videos on this subject and is an impeachable source for info on anything. Plus he's entertaining.
@zbaby822 жыл бұрын
Excellent Terry. Dear Fender, please stop putting IC caps into your amps. Are you trying to ruin your good name?
@brownmonkeybananayellow2 жыл бұрын
It wasn't only IC that had this issue. It was electrolytic industry around the early aughts. en.wikipedia.org/wiki/Capacitor_plague
@scottschmittmusic Жыл бұрын
My super sonic 22 has a loud Hum with the reverb.. also when i rested my forearm in the top metal strip i got slightly zapped
@vladaface12 жыл бұрын
i have a crackling sound just on my clean channel, when i turn on the FAT switch or BURN channel everything is ok,and it is not connected to a volume, it`s just a crakling sound on clean and it is not loud but wierd
@jamescopeland5358Ай бұрын
Great video
@colinsvid2 жыл бұрын
I was wondering about meter calibration on the old beckman, I have one but the dc isn’t accurate, is this something for a specialist to undertake or can I do it myself?
@infectionsman2 жыл бұрын
Beware of those crocodile clip cables people! Remember you are taking several hundred volts of DC outside of the chassis. Even after the amp is powered down until you discharge the HV caps.
@vladaface12 жыл бұрын
great and usefull videos
@andrewjones8668 Жыл бұрын
nice work
@gillamb86692 жыл бұрын
👍🤘
@rayg31162 жыл бұрын
I have the same issue with my mesa f-30.
@jeffh73482 жыл бұрын
how old is this amp
@bobr85653 ай бұрын
What no wine?
@josephmagedanz40702 жыл бұрын
Some guys swear by IC caps, and some guys swear at them...what's up with that?
@russellhltn13962 жыл бұрын
I've seen another video that says that IC has different lines for different price points. The better ones are good. But their cheap ones turn to garbage pretty quickly.
@tomp5382 жыл бұрын
Sounds like the great capacitor plague of the 2000s. Or is this a new plague?
@CathMartin-wn4gq6 ай бұрын
I suppose Fender doesn't care? or ever see these repetitive failures/repairs from their side? as the amps make through the warranty period. So much for caring about your customers, and Fender's new amps aren't cheap at this point, with new prices on par with the low end boutique amp offerings. :(