To learn about electronics in a different and "very effective" way, check out my Patreon electronics course here:

I'm a retired EE, 40 years in power analog and RF. I have never seen anyone present electronics in the same manner that my grandfather taught me (and started a lifelong love) ...until seeing your videos. I am beyond impressed. Your series should be required coursework for undergrad engineers and trade schools. Well done, and thanks, I've re-learned a few old guy tricks.

The person who owns these amps is fortunate to have you as a friend to repair and upgrade them. We, the viewers, are fortunate to have you as our instructor to explain and show us how you did all of it. 10 thumbs up for this one.

I can't express how much I love watching these videos. You are like the Stephen Hawking of electronics. The way you explain complex (for a layman) circuits in a comprehensive and entertaining way, is unrivalled. You have me sitting through up to three hour long videos and enjoying every minute. Outstanding work.

I'm constantly amazed by your tremendous depth and understanding of electronics, from making coils, fixing parts, restorations, to even a desire to share your expertise in an entertaining way. Been a tech for almost 50 years, I sometimes feel like a beginner after watching your videos - you have re-inspired me! Thanks. Jon

I like Mr Carlson working repair old radio and explain everything!

I TRIED TO EXPLAIN TO MY FRIEND THAT RUNS SIX PACKS THAT THE HUM IS PART OF THE DESIGN AND THEIR IS NOTHING HE CAN DO EXTERNALLY TO REMEDY THE NOISE !!

Before you repair the second amp, please plug in a speaker to each so we can hear the difference in sound. Thanks, great videos!

every film by Mr C is auto thumbs up. what a gem of a channel.

I especially like the long form of your videos where you go into great detail. I am an ex-broadcast technical guy (and extra class ham) from the 60's through the early part of the 21st century and appreciate your videos very much.

I learned so much! Your practical demonstrations, both with the Carlson Super Probe and your older oscilloscope, taught me in ways I’ve never learned from a textbook. What a difference only a half a uF makes!

Nice, I love how you came to the same conclusion, not one way but with two. Great way to show how things can be done with alternate methods.

Great photography! Love the sharpness and brightness of the trace on old Tek scopes. Awesome improvement on the amps hum level.

Interesting! I've seen some designs that feature a capacitor in front of the B+ choke (think it was 2.2uf or so on average) and a lot that do not (mostly Fender Twins of different eras), but didn't know what that was for. Now I do! Thank you again Paul! Please keep the videos coming! You are a great teacher and always can inspire me to both be better at teaching these sorts of things as well as implementing them for projects I wish to tackle as well.

Thank you for the effort to make these videos with such quality. I really need that isolated probe.

I find this trouble shooting video a valuable resource and a significant step towards my understanding of dampening inductor ringing. I'm amazed that a small cap can make, or break the noise threshold on an amplifier with an LC power supply filter. I appreciate the practical methodology employed in the experimentation process, and will use this process on my own designs.

A huge thumbs up to Mr. Carlson for taking the time and effort and his grand old Tektronix scope to fill us in for what this small capacitor in front of the choke (reactance) is for! Back at tech school many moons ago I asked the lecturer what this small value cap was for exactly, I had noted this feature in quite a few amp and radio schematics. His rather annoyed sounding answer was: Cant you see?? Its for quenching RF interference!! Can we get on with the lesson now?? I have built my fair share of amps and power supplies since then, always including this feature, a small HV cap, mostly 0,68 micro, always beleiving it was there to cut diode switching hash especially on the AM broadcast band. Now I know better, thanks to Mr Carlson :-)

Inspiring videos. You have rekindled an undeveloped relationship with electronics from my youth. Now, at age 72, I have the time and the opportunity to continue my journey, not to mention keeping an active mind. During the last 3 years I have learned to speak a foreign language to a reasonable level of proficiency, now I will have to learn the French words for inductors, capacitors, valves, (tubes in your country I think) , current, voltage, impedance, resistance, capacitance, distortion, frequency, phase, etc etc etc. Subscribed and will look at your Patreon pages. Thank you.

Don't understand much of it but still find it interesting to watch and learn something!... Thanx Paul...Rob

Wow.....that capacitance lesson was great.....well done. Thanks Paul