i bought a brand new 2250B in 1975 time frame for $365 mail order. I loved the feel of the round push buttons. It was a pure work of art. Nice to see they are still around.
Nice video, simple and to the point. Having owned a Marantz 2270 for over 35 years I can attest to their quality, really beautiful units. Some people bash the vintage Marantz units but there’s a reason they keep going up in value. I would say the experience is similar to owning a nice vintage sports car, they certainly have limitations and can break, but nothing today is built the same way. Yes technology has improved, specs are better, new is different, but not necessarily more enjoyable. There is something to be said for the appearance of a unit as well, compare the highly rated Outlaw receiver to a 2270. Similar real world power and they both sound very nice, but I definitely prefer the appearance of the Marantz!
It's nice that whoever designed that allows you to read all the numbers that you can come up with if that makes sense good job good video very informing thank you
Very cool man. Good job with this. I would have never known how to test for these things without watching you. You did a very thorough job for editing only enough for your point.
I enjoyed your video. I’m not a tech but I am old enough to remember when it was new. I had Marantz separates in 1977. 3200 pre and 140 power amp. They were pretty awesome. I’ve been buying these 70s receivers for the last couple of years. I’ve had luck. They’ve been working nicely. I just bought a beautiful Sansui 5000 1970. Cosmetically it’s a jewel. No scratches or dents. It does have at least 2 lamps out and bit of static in a channel. If you’re interested in these you should check out Sansui. They were beautifully made.
Glad you enjoyed it! I have a Sansui AU-6600 integrated amp that I fixed years ago. Haven't worked on too many other Sansuis but they're definitely great!
Good afternoon this is a great video series you have I've just recently discovered December 17th You're great channel, great information Thanks a lot Question? What test procedures software do you have on your laptop with the test points and voltage readings for this 2250B receiver? I have been unsuccessful trying to find test procedures for a Marantz 4400 and 4300 that are actually usable. Could you tell me where you found these software procedures?
Hello, I have two proposals for the next movie: 1. Enchance the power measurement with higher frequencies up and over 20kHz (hence You have load resistors, You're save). 2. Complete sweep with RightMatkAudio - ist really easy setup and gives interesting overview of whole rig. I You post results of course, the program produces nice charts, which can be easily zipped and posted.
@@leonidbreshnew401 Most PCs and sound cards have too little power and too much noise to be useful testing vintage audio gear. RightMark Audio is of no help here. RightMark Audio can only compare what it has in-hand. It doesn't know a crappy signal from a good one. What does it compare to? It can only create a "benchmark" - then compare it to something else.
How do you go about measuring the noise an amp generates? I have never done it, but can imagine a couple of ways. But I'm not a stereo expert. I would like to test my Kenwood SE after I finish restoring it with the new caps, etc. Thanks!
I got my Technics SA-400 (mid 70's) receiver back from the tech today. I had a DC offset of 56mv and 65mv on the channels when I brought it in. Is there no adjustments for this? He says no there isn't. Is 56 and 65 to high?
The problem I have with Marantz is that they all seem to have a high THD compared to Pioneer and some Kenwoods I've had. Noisy is a deal killer for me. Some folks can't hear it.
Nice video, but did you really try to stabilize the sweep using the “time variable” control? As a tech, I assume you know the concept of the trigger system on a scope??
Meh, if that works for him, it's not wrong. I'm not familiar with that scope, maybe the trigger find doesn't work, or is funky. But I have to agree, locking in on the trigger would be my preference.
Yup, I find most all those 70's era SS amp are underrated on the watts. When we test for "max output" (I test basically the same as you), it's a nice number to know but for my stress tests, I run the amp at about 50% of that max output for 20-30 minutes. This is with a SINE wave, not music, so it will heat the amp like crazy - it's another aspect of testing an amp, IMO. And ya, for example - here's an underrated Vector Research receiver made in like '76, rated at 65 watts, skip to post #13 audiokarma.org/forums/index.php?threads/vector-research-nostalgia-strikes-again.801906/
Basically just letting it play music for, say, half an hour. The power amplifiers need to be "brought up to temp" before the bias can be set to the service manual spec.
There is saying : "If ain't broke, don't fix it!" If you want to play with your project that's fine. Otherwise I would stick to that saying! Just my two cents.
i bought a brand new 2250B in 1975 time frame for $365 mail order. I loved the feel of the round push buttons. It was a pure work of art.
Nice to see they are still around.
Nice video, simple and to the point. Having owned a Marantz 2270 for over 35 years I can attest to their quality, really beautiful units. Some people bash the vintage Marantz units but there’s a reason they keep going up in value. I would say the experience is similar to owning a nice vintage sports car, they certainly have limitations and can break, but nothing today is built the same way. Yes technology has improved, specs are better, new is different, but not necessarily more enjoyable. There is something to be said for the appearance of a unit as well, compare the highly rated Outlaw receiver to a 2270. Similar real world power and they both sound very nice, but I definitely prefer the appearance of the Marantz!
It's nice that whoever designed that allows you to read all the numbers that you can come up with if that makes sense good job good video very informing thank you
Very cool man. Good job with this. I would have never known how to test for these things without watching you. You did a very thorough job for editing only enough for your point.
Glad you enjoyed it. Thanks!
Following your instructions I was able to quickly analyze the wpc on a receiver that I was working on, thanks for the fine tutorial!
I enjoyed your video. I’m not a tech but I am old enough to remember when it was new. I had Marantz separates in 1977. 3200 pre and 140 power amp. They were pretty awesome. I’ve been buying these 70s receivers for the last couple of years. I’ve had luck. They’ve been working nicely. I just bought a beautiful Sansui 5000 1970. Cosmetically it’s a jewel. No scratches or dents. It does have at least 2 lamps out and bit of static in a channel. If you’re interested in these you should check out Sansui. They were beautifully made.
Glad you enjoyed it! I have a Sansui AU-6600 integrated amp that I fixed years ago. Haven't worked on too many other Sansuis but they're definitely great!
Sansui was known for making noisy amps. THD was off the chart compared to other models like Pioneer.
Another excellent video. Thanks.
A great video, thanks.
Love these videos!! just wondering where you buy the incandescent lights ? Thank you
Thanks! Great job. Can you talk more about the big power resistors do you use to make the test? Thanks in advance
That was excellent!
Nice video, I do believe all channels must be driven under load for a valid measurement...
You didn't see the two massive load resistors connected to the speaker outputs? He knows that.
" I dont have very nice things" classic Aidan
Good afternoon this is a great video series you have
I've just recently discovered December 17th You're great channel, great information
Thanks a lot
Question?
What test procedures software do you have on your laptop with the test points and voltage readings for this 2250B receiver? I have been unsuccessful trying to find test procedures for a Marantz 4400 and 4300 that are actually usable.
Could you tell me where you found these software procedures?
I have my Marantz 2325 in for a refurbish, hope it works out.
thank you...
Hello, I have two proposals for the next movie:
1. Enchance the power measurement with higher frequencies up and over 20kHz (hence You have load resistors, You're save).
2. Complete sweep with RightMatkAudio - ist really easy setup and gives interesting overview of whole rig. I You post results of course, the program produces nice charts, which can be easily zipped and posted.
Great suggestions - I had not heard of that software. I will need to buy some better gear!
@@AHFixIt no, You don't need better gear, You need line out and line in in your soundcard, check RightMarkAudio site!
@@leonidbreshnew401 Most PCs and sound cards have too little power and too much noise to be useful testing vintage audio gear. RightMark Audio is of no help here. RightMark Audio can only compare what it has in-hand. It doesn't know a crappy signal from a good one. What does it compare to? It can only create a "benchmark" - then compare it to something else.
Thats cool i have a 2216b but it plays through 1 side so a channel must be out wonder if it can be fixed?
How do you go about measuring the noise an amp generates? I have never done it, but can imagine a couple of ways. But I'm not a stereo expert. I would like to test my Kenwood SE after I finish restoring it with the new caps, etc. Thanks!
What size and brand dummy load resistors do you use or recommend? All my equipment is Marantz from 4270, 4140, 140 amp, 1250 amp, 300dc amp.
Thanks
I got my Technics SA-400 (mid 70's) receiver back from the tech today. I had a DC offset of 56mv and 65mv on the channels when I brought it in. Is there no adjustments for this? He says no there isn't. Is 56 and 65 to high?
Is there a difference between 2250 and 2250B parts?
The problem I have with Marantz is that they all seem to have a high THD compared to Pioneer and some Kenwoods I've had. Noisy is a deal killer for me. Some folks can't hear it.
Nice video, but did you really try to stabilize the sweep using the “time variable” control? As a tech, I assume you know the concept of the trigger system on a scope??
Meh, if that works for him, it's not wrong. I'm not familiar with that scope, maybe the trigger find doesn't work, or is funky.
But I have to agree, locking in on the trigger would be my preference.
It's a pretty old scope and I think it was inexpensive for the time also - inherited it from my Grandfather. Good enough to show clipping!
Yup, I find most all those 70's era SS amp are underrated on the watts. When we test for "max output" (I test basically the same as you), it's a nice number to know but for my stress tests, I run the amp at about 50% of that max output for 20-30 minutes. This is with a SINE wave, not music, so it will heat the amp like crazy - it's another aspect of testing an amp, IMO.
And ya, for example - here's an underrated Vector Research receiver made in like '76, rated at 65 watts, skip to post #13
audiokarma.org/forums/index.php?threads/vector-research-nostalgia-strikes-again.801906/
They call that unit the ole “3 quarts in a 1/2 gallon jug 🤣”...
What does warming up a receiver mean?
Basically just letting it play music for, say, half an hour. The power amplifiers need to be "brought up to temp" before the bias can be set to the service manual spec.
There is saying : "If ain't broke, don't fix it!"
If you want to play with your project that's fine. Otherwise I would stick to that saying!
Just my two cents.