It is what I'm looking for Mark. Thanks! Great series!! Can't wait to build one with you.

11:53

This is awesome! The level of detail makes the demonstration perfectly clear. Thanks for all of your hard work!

I have a 2247a I bought from a recycling place to Advance my understanding & learning of Electronics . The phosphorus screen works perfect on it however, The rest of it does not work. Since then I've bought a digital oscilloscope. fixing the tektronix 2247a oscilloscope is Way Beyond me!

Thanks Mark. Useful tips from grounding probes, dummy load considerations, to standard yet essential diagnostic procedures and thought process. Good stuff. Enjoy all your tube amp segments.

Im a rf tech for 40 years now retired. You are sure right. HF causes all kinds of connection problems. Very fun videos. Keep up the great work.

Thank you so much for taking the time to make this video series. I have learned more in the time watching these videos than I have been able to learn reading over the last six months, the way you present the information is not just educational but entertaining also. When I read, my mind tends to wander and I have a hard time retaining what I have learned (probably ADD 😂) but your explanations and demonstrations soak right in. Thanks again

This also works for me. I'm waiting for the SS demo. You're showing actual O-scope connect points which is not normally shown in other diagnostic videos. I really appreciate your detail!

Mark. Great series on O-Scopes! I'm a newbie hobbyist as well as an Extra Class Ham Radio operator like yourself. I plan to specialize in RF (namely vintage HF transceiver) repair work. Would LOVE, LOVE, LOVE to see a part 5 focusing on troubleshooting with the scope this type of gear. I'm fairly certain there are other hams on your channel who would like to see this too. Keep up the great work and please mix in an amateur radio repair every once in a while.

Don't forget the solid state portion. So far the videos have made me more comfortable using a scope. Thank you!

this video series, has been an excellent teaching and learning tool for a green rookie like me.

Excelent! - clear and detailed instruction - looking forward to working on the solid state amp :-)

absolutely fantastic series. Educational and fun! Love it! For my part I'd be also interested in troubleshooting of analogue recording gear. For example reel-to-reel tape machines, analogue outboard effects such as compressors, tape echo, flanger. Anyways, I'm learning a lot here! Thank you so much!

Great video. Thanks. I’ve been using scopes for forty years, but I haven’t used them much for tube circuits. This was very useful information. I was a little concerned when you walked through the test points without referencing the schematic, but I was glad to see you went through the schematic at the end. I can see the efficiency of not referring to the schematic if you’re already familiar with the circuit and tube pin outs.

Thanks Mark, these are great. Love the troubleshooting especially.

perfect, very educational, thank you for your work, appreciated

Thank you for the informative video. The schematic walk-thru at the end helped considerably.

These are great. It's been a very long time since I worked on a service bench and that was all low voltage stuff apart from the mains. Nearly everything was done with a DVM. Learning how to work safely inside old amplifiers and radios is an awesome prospect. :)

Thank you! I can't wait for the push-pull part, as I'm currently trying to diagnose noise in a new build and I recently acquired my very first scope (Tektronics 2220)!

I could not have imagined a better video series to watch. Easy to watch and follow and a little entertaining too.