After viewing this video a second time had to add my two cents to second everything others have said about your endurance, patience, knowledge, and skill. Your love of the equipment and the joy you find in repairing it (despite the frustrating experiences at times) shines through. You really are an inspiration for anyone who takes the time to watch your presentations and ‘solder chats.’ This one was a beast of a repair, a resurrection, really; it had already served a useful life to a previous owner.
Fantastic series Tony! You really covered all the bases of a thorough restoration. I especially appreciate the time you took with the transistor replacement information. Personally, I enjoy your "solder and chat" sessions, and I now know more about Xrays! Thanks for all the knowledge you share with us.
Thank you Tony for that very interesting ride through a tough project troubleshooting and restoration of a fantastic amplifier. Not many of these out in the wild in dependable condition that's for sure.
Tony, if I were a hospital administrator you'd be on speed dial. I bet you could keep my old x-ray machine working forever. Incredible technical prowess, enjoy your videos immensely.
Speaker terminals look a little better than “ok” Tony, they look FANTASTIC. Never was a fan of those old ‘spring lock’ type terminals - especially in higher powered amps & receivers. Could never even get a decent gauge speaker wire in them. Great work as always Tony! Thank you for your continued and awesome work my friend.
Those dirty fader contacts are exactly why I avoid buying any Marantz with a fader or slider. Potentiometers are much easier to replace or clean. Super cool you demonstrating how to work on them though.
Excelente trabajo Tony. Me podrías pasar el link de donde compraste los condensadores de 10.000uF 80v, tengo un Power Marantz modelo 300DC y tiene sus condensadores originales y quisiera cambiárselos por uno nuevos, ya son mucho años de uso.
What I think would be cool, since you do not have a top cover for that amplifier, you could make a clear acrylic top for it so you could see inside the amplifier instead, that would be cool. just a thought that’s all.
Wow! That hour flew by. I can’t believe the video is over already. That unit really seems to have had a hard life. Good catch on the isolated ground into the phono stage. Do you think that its inclusion was intended to counter ground loops which be a real problem for small signal amplifiers?
I think it's about the Hobby. But you do raise an interesting question. Would it be worth it to you to cover the expense for the repair to this piece of equipment?
Oh yeah!. It is still time (before parts are NLA), to fix/ refurb these for sure!. Properly done, these 70's quality audio gear will still, out-last anything modern and new. No plastic crap on these either...
In many cases, it isn't worth it, other than the challenge of the hobby. In this case, I would say that this is a fairly rare model that was top of the line for the Marantz Integrated amps being produced at that time. Due to the build quality and fairly service-friendly design, it was worth it to me to repair it, at least to a point that it can perform as it should. As for a full cosmetic restoration, that is beyond what I would do.
The Bias circuit in the phono stage drives the output as a constant current source. This raises the signal above the noise floor and reduces distortion, while giving voltage amplification. I may have done the math wrong, but after just a quick look, it appears as if each of the outputs dissipate just a bit under 800 milliwatts at idle. This is a good bit of heat to dissipate, which is why the big transistors and heatsinks are needed.
Brother, that is an amazing rebuild! Excellent job!
Excelente restauración Tony.
After viewing this video a second time had to add my two cents to second everything others have said about your endurance, patience, knowledge, and skill. Your love of the equipment and the joy you find in repairing it (despite the frustrating experiences at times) shines through. You really are an inspiration for anyone who takes the time to watch your presentations and ‘solder chats.’ This one was a beast of a repair, a resurrection, really; it had already served a useful life to a previous owner.
Fantastic series Tony! You really covered all the bases of a thorough restoration. I especially appreciate the time you took with the transistor replacement information. Personally, I enjoy your "solder and chat" sessions, and I now know more about Xrays! Thanks for all the knowledge you share with us.
Thank you Tony for that very interesting ride through a tough project troubleshooting and restoration of a fantastic amplifier. Not many of these out in the wild in dependable condition that's for sure.
Tony, if I were a hospital administrator you'd be on speed dial.
I bet you could keep my old x-ray machine working forever.
Incredible technical prowess, enjoy your videos immensely.
Such a fantastic job. So much talent. Thanks for the video. Well done Tony.
Sheer artistry, it's really great to watch your painstaking and skillful work.
Speaker terminals look a little better than “ok” Tony, they look FANTASTIC. Never was a fan of those old ‘spring lock’ type terminals - especially in higher powered amps & receivers. Could never even get a decent gauge speaker wire in them. Great work as always Tony! Thank you for your continued and awesome work my friend.
They were probably a bit overkill, but it's what I had in stock at the time. Thanks for the comment!
Great job Tony. Thank you for letting us watch over your shoulder.
Ditto!!! Enjoyed watching and learning.Thanks!
Awesome series Tony. Thank you
Those dirty fader contacts are exactly why I avoid buying any Marantz with a fader or slider. Potentiometers are much easier to replace or clean. Super cool you demonstrating how to work on them though.
Crikey Tony, that was a marathon repair, hope you give the owner a copy of the video so he appreciates the work you did..
awesome sound ... that is a keeper for sure
Tony, you are the best!
On the Keithley 2015 you can use the filter function to smooth out the THD readings. Helps a lot.
What I’ve read is audio coupling NPs are closer to ideal than polarized.
Look forward to seeing your method of using damping grease on pots.
Interesting that the output transistors of a phono preamp need to be heat-sinked. (20:36))
Gran bel lavoro Tony. 💪
Excelente trabajo Tony. Me podrías pasar el link de donde compraste los condensadores de 10.000uF 80v, tengo un Power Marantz modelo 300DC y tiene sus condensadores originales y quisiera cambiárselos por uno nuevos, ya son mucho años de uso.
What I think would be cool, since you do not have a top cover for that amplifier, you could make a clear acrylic top for it so you could see inside the amplifier instead, that would be cool. just a thought that’s all.
I actually like that idea. Maybe......
On point idea.
There is a 1300DC listed on e-bay for 13 grand. Wow!!!
Wonderful!
Wow! That hour flew by. I can’t believe the video is over already. That unit really seems to have had a hard life. Good catch on the isolated ground into the phono stage. Do you think that its inclusion was intended to counter ground loops which be a real problem for small signal amplifiers?
Excellent series Tony!
Thanks Tony
👍
What's the nominal life of the power supply filter caps? Did you have to replace them?
Did you end up fixing the Bias of both channels but not show it?
Christ Almighty.
Considering time and materials, not to mention being properly equipped to do so, is it worth trying to resuscitate a unit like this?
I think it's about the Hobby. But you do raise an interesting question. Would it be worth it to you to cover the expense for the repair to this piece of equipment?
@@jdmccorful Sure, hobby outweighs expense for enjoyment. But, how much time and material expense can a hobby tolerate?
Oh yeah!. It is still time (before parts are NLA), to fix/ refurb these for sure!. Properly done, these 70's quality audio gear will still, out-last anything modern and new. No plastic crap on these either...
In many cases, it isn't worth it, other than the challenge of the hobby. In this case, I would say that this is a fairly rare model that was top of the line for the Marantz Integrated amps being produced at that time. Due to the build quality and fairly service-friendly design, it was worth it to me to repair it, at least to a point that it can perform as it should. As for a full cosmetic restoration, that is beyond what I would do.
@@davidwinokur2131 as long as you get the enjoyment that you need. Remember what the Beatles said?
There is no one in Toronto Canada who can do what you do for my Marantz 1060
If it was used as a DJ amplifier, maybe the reason the controls are gummed up is because of smoke machine smoke.
I wonder why they have used such power transistors at the end of the phono pre-amp.
My thoughts exactly..why such large final transistors in a line level output?
The Bias circuit in the phono stage drives the output as a constant current source. This raises the signal above the noise floor and reduces distortion, while giving voltage amplification. I may have done the math wrong, but after just a quick look, it appears as if each of the outputs dissipate just a bit under 800 milliwatts at idle. This is a good bit of heat to dissipate, which is why the big transistors and heatsinks are needed.
@@xraytonyb Thanks Tony. I don't fully understand that, but I see that it is a technique to lift the s/n ratio, a little bit like Dolby does I assume.
Does that imply class A amplification?