New D-lab series Basic Training Tube amp repair How to really fix a dirty pot Not what you think

[@zummliller]

Bravo!

[@tomasjones3755]

Appreciate this series; looking forward, to more!

[@stevedanby8042]

Now this is a great idea and doing it in this manner will be invaluable to so many people who just want to learn and have an interest in this. Forums are great but seeing and watching makes all the difference. I'll be tuning in

[@d-labelectronics]

Thank you Steve, I am trying to up the game

[@simonspeaker]

yes!

[@joepulltab6355]

Awesome!! As someone new to electronics and building amplifiers, this series will be very helpful. Thanks Terry!

[@BCEpedals]

This is wonderful to know! This going to be a great series! Excited for more!

[@iangray7410]

I know he likes red wine, but which one ?

[@d-labelectronics]

Robert Mondavi Cab

[@bobbyohanesian4228]

Love your videos and very happy that your granddaughter is already into electronics like me at age 8 or so, I built all the RadioShack pbox kits,had the lab spring board, awesome for teaching children basic electronics!!!! There is hope for the youth of America!!! Hooray! Thanks keep it going T

[@haroldsparkman6008]

Thanks Terry. Looking forward to learning from an excellent Technician!

[@joeteejoetee]

I love the look of "Orange-Drop" Capacitors!

[@GlennJimenez]

Definitely prettier than those crappy green chiclets

[@CC-te5zf]

Howdy D-Lab! This was a great lesson!

[@theoloutlaw]

I would not have thought .3 or .8 of a volt would cause that much of an issue on the other side of the Cap. Thanks Terry for the 'awakening' of such things.

[@kmackiss]

Thank you Terry , for this new series of video's . The testing with is what I am always looking for . Please keep releasing your great video's .

[@iangray7410]

Any idea what wine he likes ?

[@d3w4yn3]

Great job on walking us through the process!

[@briancassidy6678]

Keep 'em coming! Great time and money saving tips are always appreciated.

[@LitesLAB]

Great video Terry, the troubleshooting was presented very well and easy to follow. You rock!

[@incredifunk]

Love this format. And the way it was presented I made it easy to learn. I watched mini repairs by yourself and several other technicians but have trouble understanding. This presented in this manner one issue at a time really hits it on the head for me

[@jonathanhorne6503]

Topic suggestion. Troubleshoot a conductive board.

[@zulumax1]

When I heard the sound I knew what it was, DC across the pot. Once you have heard that sound you know. Then you need to track down the source of the DC and how it is getting there. I had a stepped type treble and bass controls on a Magnavox console that would pop with every step change due to leaking caps. Replaced the coupling electrolytic caps in the preamp and amp and no more pops.

[@Germinalx]

Lots of guys on line. I like Terry.

[@skycarl]

What a great idea to put out there Terry. Gonna help a lot of people.

[@edwardmonsariste4050]

It’s always such a joy to work on old hand wired boards and chassis mounted sockets and pots. Today’s typical tube amps are ugly multiple double sided circuit boards with surface mount components and a rats nests of ribbon cables. You’ve got to have an electron tunneling microscope to see what you’re doing. You literally have to rebuild an amp just to change a blown hissing resistor. Good look on your new full time work. Always enjoy your videos!

[@ChristopherMurphy-c6e]

Thank you for sharing your knowledge and expertise with us, who are wanting to learn and understand these issues ! Very Informative.

[@edcataldo7019]

Thanks Terry for giving us access to the D-Lab Team!

[@iangray7410]

Excellent approach to a new beginning, especially if it is often running !

[@larrpeninger]

I love this! This is information you don't ever get from a repair center.

[@GlennJimenez]

I wouldn’t be surprised if this guy had the skills to build his own amp.

[@cameronstolhand7149]

Great idea! I'm down to watch the entire series.

[@dhpbear2]

Congrats on the new series, Terry! xraytonyb is doing a similar series on his channel. Building an integrated stereo tube amp kit and walking though EVERY aspect of it. Tony even tossed the circus board in favor of point-to-point wiring! The circuit is SO simple, it's comical seeing it laid out on a PC board!

[@zulumax1]

David Perkins, I love Terry and Tony, both great teachers of how to do point to point wiring, and do it right. It is an art, and takes that old school knowledge which is becoming a lost art. I tip my hat to a couple of great teachers here on the tube.

[@Uuuuuuurrgggggghhhhh]

Very good, Terry. I like this new series!

[@simonspeaker]

WOW! Could be awesome if you could start explain from the very basics and schematics 😮

[@DavidBrown-ez5jc]

Absolutely a legend teacher to all us audio wannabe amp techs

[@jerryjohnson3801]

thank you, I've been looking for a truly beginners video series on how to troubleshoot power amplifiers

[@josephmagedanz4070]

Looking forward to seeing this new series...I'm sure I will learn a lot. Thanks!

[@umajunkcollector]

WTG Terry, thanks again for sharing your valuable knoeledge. Those dang leaky caps strikes again! Knowing which stage or section of the amplifier to troubleshoot comes from understsnding the circuits of each staage, power supply, preamp, amp, or speaker. The preamp cam be devided into sections, tone, fx, or controls and their tubes. I've learned from you a lot aboit tubes and their purposes or multipurposes, how to break down each stage by their tubes, PS, preamp, and PA. One thing that I do first is troubleshoot for bad connections, then old caps. Way back, we tested tubes first at the Rad Shak becsuse the caps and pots were not old yet. Then maybe a blown speaker from abuse? Sometimes we got lucky, and bought a ""Lifetime"" tube or cheapo speaker from Radidio Shak!

[@umajunkcollector]

PS: btw, way back, I had a Rad Shak MIJ guitar amplifier that had two twelves as I recall. It had four tubes, I guess, since it had reverb and tremolo. It was either a 6aq5oir 6bq5 amp. Lafayette sold a simular guitar amp that was supposedly a rebadged Univox. It serms that you favor "made in the usa" amps. The MIJ copy cat amps were built cheap, and at best were good for home practice. I'd like to see you do a vid about an old cheapo made in Japan copy cat amp, to see a diagnostic 50+ years later. . Rad Shak amps are quite rare, but you might find a tubie Univox for funage.

[@MrAlFuture]

In really looking forward to this series. Great idea! Thanks, Terry!

[@jamesrobinsonjr.9384]

Really looking forward to this series.

[@mrd5376]

Terry,Awesome video as always wish you were closer to my home town! Thanks Dan Penticton BC

[@jimhibert]

Nice video, Terry. Please keep ‘em coming.

[@stephenfabiszak6039]

I really enjoyed the video. When you verbally reference the schematic diagram, could you show us on the actual schematic if you have one on hand?

[@chattanoogaguitarworksguit7956]

Great presentation. Well explained and clear tests/ results! Looking forward to the next episode. You could charge for this stuff

[@montycline9840]

Great ideal Terry keep him coming please, Thank you so much for thinking of us.😁

[@74cannelle]

Very good approach, Terry 👍

[@bobr8565]

Keep ‘em coming Terry!

[@zulumax1]

I think what you are doing is a great idea! Reminds me of what Marlin Perkins did with Mutual of Omaha's Wild Kingdom show back in the 60's through the 80's. There was a disclaimer at the beginning of the show that all events may be staged, but depict actual animal behavior in the wild. A great learning tool that recreates events which would be hard to come across by chance in the wild and catch on film.

[@John-te3zd]

Great video Terry, love the new series

[@davehunt5706]

Fantastic news Terry You are the wizard

[@michaeltuckey7]

Great video! Looking forward to the next video in the series!

[@meblaw1]

Thanks Terry! Does the signal ride on the DC and that is why you’re blocking DC…can you provide a little more explanation there ? Also, it would be helpful to know how to wire jacks and pots and provide explanation on how the signal passes ..

[@vitoleo7197]

very nice Terry. 73 from ON6VL in Belgium

[@denniscrofoot9238]

Great job Terry, I could even understand it.😁

[@WillemvanLonden]

Keep 'm coming, Terry!

[@jackleg266]

terry, wonderful! anxiously awaiting next clip.... thanks

[@colinsvid]

Good video terry, I’m looking forward to seeing the next one

[@michaelgregg187]

Quite helpful, Terry! Keep em coming please

[@patprop74]

Looking forward to all of this series! Excellent Terry

[@pauldow1648]

Short.sweet.and to the point. Helps me to learn how circuitry is supposed to work...

[@johnmcgrath8673]

Terry, great idea for the series. Can’t wait to see more.

[@edwardhannigan6324]

Wow Terry, great new series...! Can't wait for more info, just love it..Ed..UK..😀

[@d-labelectronics]

Thank you for your continuing support my friend

[@edwardhannigan6324]

@@d-labelectronics You're just the best Terry..😀

[@jakeblues3676]

Terry you’re amazing and we so much appreciate the help given HAM Radio

[@zundfolge1432]

wow! MY LAPTOPS speakers wouldnt play the rumble but when I hooked up a mega boom to it, I heard the rumble.

[@schmaler68]

I think I should urgently replace my capacitors on the Orange OR120. That's probably where my problems are. Many thanks, and best regards from Germany, Kay

[@chowmein6219]

Thanks Terry. Looking forward to more in this series.

[@billhart4710]

Thanks! Well spoken, concise - just what I needed to know. 👍👍 ...

[@christophersambuco9414]

I'm always glad to see a new DLab video on my KZbin feed

[@markcunningham6086]

Yep....Im with ya Terry. More please.....

[@dhpbear2]

2:30 - My guess is a leaky coupling cap leaking DC onto the pot. This is one of those SNEAKY not-at-all-obvious problems.

[@donaldfilbert4832]

Excellent series !! I was surprised that a small leakage DC voltage (under 1 volt) could cause that kind of problem !! Thanks for the series !!

[@blues61]

Love this new series. Please continue.

[@simonaguilera1688]

Enjoy it very much. More tutorials please. Best regards

[@hestheMaster]

So simple ,with just using a voltmeter to find the errant culprit or culprits. After hearing the pot was replaced and had the same issue one must go a little deeper to find the problem. Thanks Terry.

[@davidsigglekow1349]

your expertise in these matters is always greatly appreciated. Thank you!

[@daviddahlgren9603]

WoW , I learn something almost every day ! ;)

[@zbaby82]

Excellent! Please more videos like this.

[@ckdesign]

nice idea for the series Terry - thanks for all the great content. you mention the problem here being a leaky "tone cap" rather than identifying it as a leaky "coupling cap" feeding the tone stack. thought it might be helpful to point that out since "tone cap" is the standard term referring to a cap between a tone pot and ground responsible for altering tone and using that term to describe these frequency tuned DC-filtering couple caps could be a little confusing for some audience members. cheers.

[@robertbull6895]

Great video. Keep them coming Terry.

[@d-labelectronics]

Yes Sir, I will keep them coming

[@trbr1799]

fAMPtastic! Great content, Terry! Been subscribing for years... this kind of stuff is icing on the D-Labs cake. Appreciated!

[@rickcarter6591]

Excellent Video. Short and to the point.

[@ericedelman]

This is good! Looking forward to more like this!

[@ericedelman]

I'll bet there are lots of folks who would love to see one of these done with an inoperable Fender tremolo circuit. I just spent a few hours fixing one. I tried everything. Once I took the LDR leads out and tested the resistance out of the circuit, it was obvious the resistor had gone bad. I assumed since the light was blinking that the opticoupler was fine. I wound up making my own new "roach" with an LDR and high-brightness LED. Trem works better than ever now. Anyway, I'm sure you have a much better approach to it than I did and I could have saved a lot of time. I make tons of KZbin videos. I'm a Realtor so nobody watches mine, but I know good video production and this format is great! Short, to-the-point and packed with good info.

[@kameel68]

I measured 1V on C5, C6 and C7 on my Marshall JTM30. It has a slight rumble on the tone pots. Thanks for this vid.

[@Wizardofgosz]

Good stuff! But no Star Trek references!!! 🙂

[@d-labelectronics]

Its on the way man

[@jmormino5465]

Love this Format as a series. Thanks.

[@openup007]

Two knobs up… Good job Terry!!!

[@bkbinj6320]

Thanks for sharing your knowledge Terry.

[@ScottyBrockway]

There can be leakage on the board itself too, and changing the caps is just a temp fix and they aren't really leaky. Should desolder one end first and check if there is any voltage to confirm suspicions. If there is none, start measuring the board, they attract crap from smokers and moisture, also that wax that CBS started adding later can become conductive and it needs to be removed in some cases.

[@johnsalaman503]

I personally enjoy every one of d labs videos..great job terry

[@jamiboothe]

Thank you for the fantastic hands on sharing approach in this vid. If I ever make money repairing an amp, I will keep you in mind. Currently it is just a hobby to build amps.

[@audiotechlabs4650]

This video and the next ones are a vital look at how to repair your own amp. Many of us, your loyal subscribers would have known the answer to the 3 choices you presented because you have explained it before. I knew. By the by, I normally watch KZbin videos on the iPad speakers but on this one I used headphones and the opening music was great! I found out what I’ve been missing! Love from spring in the Rocky Mnts. Thanxz

[@fatred777]

That was a great video!! Short and to the point w theory and repair. Much needed series here in KZbin land.

[@czgunner]

Awesome video. Looking forward to more!

[@miguelrichartmellado2834]

Hi Terry.

[@d-labelectronics]

Hello my friend

[@PhoenixGuitars]

Thank you! Really looking forward to this insight and knowledge. Please continue!

[@richard66754]

This is awesome! Thank you for sharing your knowledge with us!

[@noslen954]

You are the best Terry. Thank you for these. I have learned very useful information from these.

[@kimmassey6596]

Great job. Please keep ‘‘em coming

[@kenwhelan3003]

A great new series... thumbs up here in WNY..

[@justgary4342]

Very helpful tip. Thanks Terry!

[@freddycookjr.2164]

GREAT WORK THANK FOR ALL YOU DO / YOU ALREADY HAVE HELPED SO MUCH LOKKING FORWARD TO SERIES

[@werner.x]

Thank you. Great idea! And really needed. Please continue.

[@jefflangton6033]

Thanks Terry Good Stuff...Jolten Jay Aka Jeff 👍

[@entangledwebmanagement5842]

Absolutely helpful. Thanks, Terry.

[@DouglasKehres]

just started fixing amps love this and i have seen the resistor thing years ago when i first got into tube amps as a young teen tried to help him but told him you have messed with this thing to much