Once again Tony explains signal flow and electronic theory in a way that most beginner and novice enthusiasts will understand. His dedication to his hobby is first rate EVEN though he has a FULL time job + and family. We should all be so grateful for his talent and dedication to this channel. I have always struggled understanding certain electronic circuits but no longer with these simplified and interesting explanations. THANK YOU! BTW- I made these driver boards and they tested clean @ 110 watts per channel. And boy do they run cooler( I used a copper heat sink bar) then the original!
I'm not knowledgeable enough to ask sensible questions about this McIntosh repair series. However, I sure learned a lot from this video. Tony explains the theory in terms I, and I guess other beginners, can understand. Thanks for sharing your knowledge in this vid. Deep Respect Sir. 👍👍👍👍👍
McIntosh has always had a legendary following among audiophiles and your expert and well documented explanations, oral and visual, show us exactly some of the many reasons why that is. It’s one thing to “rave” about how good a piece of audio gear is, but you provide your viewers the “inside design story” (although many of your followers already know that) to provide the documented evidence to support the McIntosh legends. “The proof is in the pudding.” As always, spectacular demonstrations and acute observations, explanations and analysis in your presentations. Peace, happiness, joy, good health, and of course heaping financial success may come your way Tony 👍🏻😂
I always wondered about the wattage with some radios that don't have seperate taps for different ohm speakers amd claim a certain wattage, I now know it was a best case scenario they were claiming. As a electrician I wondered how they would change the amperage. It has been always been in front of me and I never seen it. I I fully understand it now, thanks Tony.
Full load all day long. Love McIntosh. Still have to rebuild and install TonyB's black input boards, but after replacing main filter caps, multi cap, 12 output transistors, and a couple of other output components and my MC2105, it does about 134 RMS into 8 Ohms before wave form begins to go perceptibly flat. All day long.
I got one of these amps that worked for me for 10 years and about 8 years ago Edison in doing some upgrades turned power on off on off on in about 5 seconds, at that point it started blowing fuse. You want to do another fix video on my amp? I replaced it with a Belles 150A, but I swear the Mac sounded better.
Mac's claim to fame is that they design and build their own auto-transformers. As far as I know they are the only home-audio mfgr that uses transistors with output transformers.
Tony @21:49 you have already pointed out that the O/P sees a constant 2ohm load. Then I loose your logic because you then say that for a 4ohm load, because the voltage is greater, the O/P has to deliver more current. I can't see that because the transformer will increase the voltage but the load will draw less current (as you indicated in your on screen text). Surely you are contradicting the effect of the transformer in that as the load impedence rises the current inversely reduces and the wattage remains the same. This would be the only reason that the designers would use a transformer. Power out must equal power in therefore at any load the O/P sees the same load and takes no account of the speaker's requirements. Have I got this wrong or did you turn yourself upside down at this point?
You are correct. That was a poor choice of words and not totally correct, in the way that I stated it. If there is 100 Watts dissipated at the 2 ohm tap, there would also be 100 watts dissipated at the 4, 8 or 16 ohm tap, as long as the speaker is the correct impedance for that particular tap. The difference is that at each HIGHER tap there will be HIGHER voltage but LOWER current to produce that same 100 Watts. Therefore, there will be higher current at the 2 ohm tap than at the higher impedance taps. Thank you for pointing out another Tony-ism :)=)
People want those boards. Maybe you could find a way to make them available through a vendor you might know? Hell, I'll be the vendor and ship them out if I get paid a little.
I enjoy your videos immensely, Come to think of it Class D amplifiers give a similar sound to that of vacuum tubes the rest of this comment is for the bots at TH-cam. #youtube_bot("Mr Bot why do you continually butt in which is very rude and should not be tolerated");
Once again Tony explains signal flow and electronic theory in a way that most beginner and novice enthusiasts will understand. His dedication to his hobby is first rate EVEN though he has a FULL time job + and family. We should all be so grateful for his talent and dedication to this channel. I have always struggled understanding certain electronic circuits but no longer with these simplified and interesting explanations. THANK YOU!
BTW- I made these driver boards and they tested clean @ 110 watts per channel. And boy do they run cooler( I used a copper heat sink bar) then the original!
I'm not knowledgeable enough to ask sensible questions about this McIntosh repair series. However, I sure learned a lot from this video.
Tony explains the theory in terms I, and I guess other beginners, can understand.
Thanks for sharing your knowledge in this vid.
Deep Respect Sir.
👍👍👍👍👍
I just procured one of these 2100's I'm so excited to watch this video and use this discussion and video to restore mine!
Thanks for taking the time to answer some questions Tony!
McIntosh has always had a legendary following among audiophiles and your expert and well documented explanations, oral and visual, show us exactly some of the many reasons why that is. It’s one thing to “rave” about how good a piece of audio gear is, but you provide your viewers the “inside design story” (although many of your followers already know that) to provide the documented evidence to support the McIntosh legends. “The proof is in the pudding.”
As always, spectacular demonstrations and acute observations, explanations and analysis in your presentations.
Peace, happiness, joy, good health, and of course heaping financial success may come your way Tony
👍🏻😂
Thank you Tony for another interesting and informative video, very clear and concise explanation.
thank you for taking the time and sharing this with us!
I always wondered about the wattage with some radios that don't have seperate taps for different ohm speakers amd claim a certain wattage, I now know it was a best case scenario they were claiming. As a electrician I wondered how they would change the amperage. It has been always been in front of me and I never seen it. I I fully understand it now, thanks Tony.
That is the B-52 of amplifiers. Glad you left with the battle scars in place.
Full load all day long. Love McIntosh. Still have to rebuild and install TonyB's black input boards, but after replacing main filter caps, multi cap, 12 output transistors, and a couple of other output components and my MC2105, it does about 134 RMS into 8 Ohms before wave form begins to go perceptibly flat. All day long.
33:37 - One obvious reason. You're driving a 2-ohm load *regardless* of what speaker impedance you have chosen!
Awesome work T!!
Thanks, Tony!
Thank you very much Tony from Jamaica one love man
It's becoming a monster!
:)
Based on your experience with many amplifiers and receivers, how would you rate the sound quality?
I admire your ability to explain a tough circuit such as this one to a really "strange" audience. [Don't ask how I know! LOL]
Hey tony love your channel i have an old kenwood kw55 tube receiver whats the vintage on that cant find the year made
I got one of these amps that worked for me for 10 years and about 8 years ago Edison in doing some upgrades turned power on off on off on in about 5 seconds, at that point it started blowing fuse. You want to do another fix video on my amp? I replaced it with a Belles 150A, but I swear the Mac sounded better.
Mac's claim to fame is that they design and build their own auto-transformers. As far as I know they are the only home-audio mfgr that uses transistors with output transformers.
Tony @21:49 you have already pointed out that the O/P sees a constant 2ohm load. Then I loose your logic because you then say that for a 4ohm load, because the voltage is greater, the O/P has to deliver more current.
I can't see that because the transformer will increase the voltage but the load will draw less current (as you indicated in your on screen text). Surely you are contradicting the effect of the transformer in that as the load impedence rises the current inversely reduces and the wattage remains the same. This would be the only reason that the designers would use a transformer. Power out must equal power in therefore at any load the O/P sees the same load and takes no account of the speaker's requirements.
Have I got this wrong or did you turn yourself upside down at this point?
You are correct. That was a poor choice of words and not totally correct, in the way that I stated it. If there is 100 Watts dissipated at the 2 ohm tap, there would also be 100 watts dissipated at the 4, 8 or 16 ohm tap, as long as the speaker is the correct impedance for that particular tap. The difference is that at each HIGHER tap there will be HIGHER voltage but LOWER current to produce that same 100 Watts. Therefore, there will be higher current at the 2 ohm tap than at the higher impedance taps. Thank you for pointing out another Tony-ism :)=)
@@xraytonyb
Tony thanks for your generous reply. Make as many mistakes as you like, you're still my favourite audio channel.
People want those boards. Maybe you could find a way to make them available through a vendor you might know? Hell, I'll be the vendor and ship them out if I get paid a little.
@Etienne Well the good news is I'm not a corporate lawyer! Just an enthusiastic hobbyist. :-)
@Etienne Ahhhh!
I enjoy your videos immensely, Come to think of it Class D amplifiers give a similar sound to that of vacuum tubes the rest of this comment is for the bots at TH-cam.
#youtube_bot("Mr Bot why do you continually butt in which is very rude and should not be tolerated");
Amplifier is rated at 105 watts per channel, not 100 wpc. I sure you know.. may just be an oversight when you are quoting power spec in video.
Do you think that the output coming through 8 ohm speakers while connected to the 4 ohm output would sound better? Just wondering.