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

Absolutely a legend teacher to all us audio wannabe amp techs

Great content, I like the new format! Subscribed

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

Please Terry keep going! Thanks for the info

Can you help with a tube amplified Bell and Howell 16mm sound projector?

How to fix a really dirty pot Not what you think, lol.

How did you get into this kind of work?

Any video about damage from not plugging in a speaker?

Thanks for your help bro ,God bless!!🙏

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

Thank you, Terry! Quick and to the point!

good idea. very helpful thanks

👏🏼👏🏼👏🏼

Brings it all home. Trace the component circuit.

Thank you sir.
From Chula Vista California.

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

Greit Terry manny thanks to show how repair old amps Tube . very greit series I appreciate you and yours fantastic videos , bay from ITALY

Thank you for this knowledge Terry! We appreciate you!

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

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

I didnt hear anything when he rotated the bass pot!!!

This is awesome! Thanks a lot Terry!!!

Where do y9ou buy capacitors? I cant find the .1 600v or the ceramic disc .01 1kv

Question: if one of the caps is more suspect than the other (the 0.1 uF in this example), in the interest of preserving the good original components (if the owner is concerned about maximum originality), why not just change the 0.1 first (since it had higher DC leaking through), and see if the 0.47 is actually good?

Excellent info and educational

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

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.

It would be great if you get footage of a amp that's REALLY giving you fits. Weather it turns out to be something stupid or complex.

looking forward to more training videos, thanks

Hello D lab, do you ever get requests for simple sine wave generator for amp repairs.

Thanks,

Hello, This is my favorite show to watch on TV . I started watching your class but it seemed you might discontinue, I hope not . I just become handicap and it my hopes I can learn a new field, regardless I just get so much listening to you doing it the rightward not mickey mouse'd

Looking forward to all of this series! Excellent Terry

thx!

Very clear demonstration! Thanks

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

Love it.

Howdy. Great.
I had a persistent problem with my DIY amp. The driver stage of one channel sounded awful and the DC levels were nuts. I disconnected the input cap. No change in levels. Then disconnected the stage neg. feedback cap. Still no change. Finally I disconnected the global neg. feedback cap. Voila ! Unmounted the cap showed a resistance of about 800 ohm. Brand new cap and faulty ! After replacing and reconnecting everything the stage worked fine. Since then I have encountered another leaky cap in the bag of 50 items I bought.
Lesson. Sacrifice the time to resistance check caps before soldering them in. Will save one a lot of headache in the long run.
Regards.

Thank you, great idea. I am happy to on thr team!

Excellent Terry! I really enjoy those kind of vids. A lot of your tips helped me out!

Thank you ....I was wondering about this! ....so 0 DC voltage....I think I have this problem on an vintage Marshall

Good Stuff Terry - love it

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!

I dig it

Very nice, Mr D! This is going to be fun!
Thank you

boy,wow, too bad the tubes can't output the DC rail voltage into 8 ohms

Great video. Keep up the good work. Very much appreciated.

I would have liked to see you test the old caps once they were out of the circuit. It would have just completed the troubleshooting argument.

Terry Nice video when I was in high school our Electronics teacher had us built this RCA AA5 chassis but he did not tell us he included either wrong value parts or defect parts !

Hi Terry,
Thank you for all the valuable information over the years.
Yes, I’m all for going in depth!
Great series idea!!