Marantz Model 7 Rescued - Gut Rebuild of Hacked Unit at the Bench

Рет қаралды 6,964

Күн бұрын

Пікірлер: 54

@tomasvalentin6896 Жыл бұрын

Hey Ben, you truly are a master electrician and a repairman. I couldn’t thank you enough for taking on this project. Thank you so much. Appreciate you.

@thealphageek1975 10 ай бұрын

Very impressive restoration. I often have to tell my clients that it's going to look worse before it gets better! You took this concept to a whole new level. Really great job. So few of us are left that can save this old equipment. You gave me a new bar to aim for. Cheers!

@denbo1064 Жыл бұрын

Meticulous and thorough - another ‘MasterClass’ restoration Ben! A pure joy to watch you bring this classic back (and beyond) original spec.

@rodneymercerchannel Ай бұрын

Definitely looks like at least two other individuals were inside before you. Great work!

@dougbarclay9185 Жыл бұрын

Ben Simply WOW! Truly impressive work. You have raised the bar for all the techs out there. As a vintage audio enthusiast, I wish I had someone of your skills close by. Keep up the good work and enjoyable videos.

@mahendranr1317 2 ай бұрын

Amazing work. Very few have this knowledge and skill to repair such classic models❤

@PrimeHiFi Жыл бұрын

Ben, I just finished the video. Phenomenal work on this. You completely renewed the life of this poor Marantz. Can’t put into words how impressive your approach, detail, explanation, and final product are. You’re truly a world class tech. Keep up the great work man.

@NovaluxStereophonic Жыл бұрын

Thanks Connor!

@cluna5231 8 ай бұрын

That’s some very clean work you’re doing, was a pleasure to watch.

@keithtrauner1738 4 ай бұрын

just amazing restoration. just a rank amateur here trying to remember some of what i used to know 40-50 years ago, and this kind of content is really fun to see. i've managed to repair a few solid state pieces (and blew up one stupidly). But enjoying the process. You're helping my confidence in getting ready to completely disassemble and restore an amp. Thanks!

@Shuksanaudio Жыл бұрын

It's such a joy to watch you work. It's true artistry.

@Amplified208 Жыл бұрын

Well done restoration of a work of art.

@johncunningham5435 10 ай бұрын

A tough challenge, but nicely done.

@TrevorsBench Жыл бұрын

Bravo, fantastic job!

@cjay2 Жыл бұрын

Wow. I'm only 46 seconds in, and I already can see that Ben's going to do good work on this thing. I'm glad I subbed (6 months ago).

@patmeadows4759 Жыл бұрын

Great work Ben. Presentation 5 star. Up to your usual super high standard. Lucky customers who have you doing their restorations.

@russbutton9347 Ай бұрын

As I watch this, I keep thinking about how many hours you had to put in this thing and how much you had to charge for it. Must have been one heck of a repair bill. Worth every nickel of course.

@oakmountainman7872 10 ай бұрын

Ben, I am very happy I found your channel. This was very impressive work. I hope you took some still pictures of the more complicated sub-assemblies to share with us. I have always wanted one of these units and if I find one; I will revisit this video. Once again, very well done sir! I just subscribed to your channel.

@dennisdunkel6731 9 ай бұрын

Excellent quality restoration. You're very patient with these old amps.

@kstlfido Ай бұрын

Nice restoration! Excellent work! Refreshing to see someone else do such a great restoration job. Interesting why you used modern film caps. If your going to the trouble of sourcing and selecting vintage carbon comps, why not select vintage caps as well? Vitamin Q type or Sprague 160P's hold up well over time. That's my preference for 7 restoration. I'm not a fan of the Hayseed's as 1)- they have no vent holes! 2)- I have no idea what they are stuffing inside them. F&T Authenicaps work great. Regarding the disintegrating side panel foam- I use a sheet of 1/8" cork. Works great and never sheds! Keep up the great work! Truly a craft.

@the-adge Жыл бұрын

Very impressive, showing every step on this amazing and thoroughly comprehensive video. However you have made a grave mistake!! Unfortunately for you now I can restore all of my Marantz 7 7cs without the need of your paid services!

@richardlinks8575 Ай бұрын

Great rescue and reconstruction! I have owned perhaps six Model 7 preamps and still own three. I wanted to know why it seems that you did not replace the form pad on the left of the selector switch. My experience has been that it was there to dampen vibrations to the wiring harness. I realized this fact when I ran my finger against the harness and it was super sensitive to touch. Did you see a date of manufacture stamped on the back side of the front panel? All of my units bore such a date. Perhaps a previous owner cleaned the back and wiped it away. All of my examples were furnished with photo-etched front panels. The lettering was not silk-screened, but those markings actually set just below the surface. Once upon a time, I owned a Model 7 which came with an original faceplate which was in fact, silk-screened. It also did not come with rack handles. Anyway! Congratulations on an amazing restoration!

@craigbrown7929 9 ай бұрын

Just did a restoration on one. The power supply had been worked over but unit was in good condition overall. I did notice two things and the owner noticed them too. One, the volume seems a bit low and the balance control affects the overall volume. I believe all the voltages were within spec and I did not have to do anything with the front panel wiring (input selector, tone switches). Other than needing to have the volume setting up high everything appears to work just fine.

@NovaluxStereophonic 9 ай бұрын

The balance circuit in the 7 actually boosts audio when put far left and far right unlike many other designs. You can use the output controls on the back of the unit to fine tune the output level if volume control is not responding well.

@DavidVanDriessen-o5q 26 күн бұрын

Impressive work!

@AudiophileStooge 3 ай бұрын

wonderful step by step

@johnsampson1096 10 ай бұрын

Great, thorough resto, Ben! I've salivated over owning one of these units for decades............. Ebay prices have gone through the roof. Non related, I'd love to see a Fisher 50c mono preamp cross your bench. I had one in the mid seventies and lost it in a sudden move. It had a tremendous phono section and clean sound. The kicker, I paid $5.00 for it at a yard sale..........

@ReyciclismoMTB Жыл бұрын

What a hack, oh my god. Great job.

@richardadelberg8961 Жыл бұрын

You are becoming a genus !

@rodneymercerchannel 11 ай бұрын

I was wondering who bought that back panel! Nice video. Thanks for posting! p.s. glad the new back chassis aligned so well with the parts and front half of the chassis.

@cruise2023 Жыл бұрын

Great job by the way, the unit looks 100%.

@meshplates 28 күн бұрын

Hell of job! Cingratulations!

@mauricedemel6142 3 ай бұрын

Thank you, sir.

@johnstuchlik5828 4 күн бұрын

1khz square wave through an inverse riaa to check the phono stage quickly.im going to try that.

@johnwilliamson467 4 ай бұрын

bolt depot for those nuts and screws.

@danhorton6182 Жыл бұрын

I appreciate your work and nice job on this unit. I do this full time as well and I too will not use third party parts, nor do I use rebuild kits of any kind. That being said I disagree with you on a few points. I think you can give a client a better end result by letting them choose on individual electrolytics vs buy multi section cans. Multi cans are always going to be more expensive than buying individual caps from someone like Nichicon. Generally the individual caps from Nichicon, Panasonic, Rubycon, etc are going to be better overall than what you get in the multicap cans (ripple current, leakage, hour rating). If a section of one of those cans goes open then you need to replace the entire can if you want to keep that stock look, where as if something happens to an individual cap then you can address it. Now with Hayseed, I used to use them pretty frequently, but three times it has happened where about 6 months or so after installation one of the sections goes bad. Trust me, I’m not the only one this has happened to. There are videos on KZbin of techs having problems with new Hayseed cans and documentation online of it as well. So I stopped using them completely. If a client wants to pay me the extra amount I am happy to stuff the original cans. Otherwise if it’s on the bottom of a chassis and they don’t care, I’ll place them on the bottom in a neat and orderly way. I mean you’re putting new polypropylenes and whatever else in there, so it isn’t going to look factory anyways. For my personal units though, I re stuff the cans. I do really like the cans you make, maybe you could make a video on the process of making some? I’d love to see that.

@NovaluxStereophonic Жыл бұрын

I appreciate the comments. If I mention making custom cans it simply refers to placing a custom order to hayseed with my specifications. On units without exposed caps I sometimes use adapt-a-cap or rebuild the can under the chassis on terminal strips (This is the best if it can be made yo fit as if one fails in the future it’s super easy to replace) I have an example of this in my Marantz 9 video. I restuff cans for some personal projects but it’s actually cheaper for the customer in most cases to pay for the hayseed cap rather than my time to restuff. I have not seen any failures yet from Hayseed after 50+ caps ordered. I have though seen CE multi-sections fail multiple times.

@stevenjackson8226 4 ай бұрын

Excellent. Loved watching this. Can you explain a little more about "marking the outside foil to minimize the noise floor" on the film caps? How do you do identify the foil side and does affect how the capacitor is installed?

@NovaluxStereophonic 4 ай бұрын

If you do a search for “Mr. Carlson’s Lab outside foil” that should get you pointed in the right direction. He does a very good job of explaining it. The process involves testing and marking each cap and then installing them in the proper orientation to effectively make the outside foil of the cap act as a shield. It’s not 100% necessary but on tube gear I try to go the extra mile to keep noise / hum as low as possible.

@stevenjackson8226 4 ай бұрын

@@NovaluxStereophonic Thanks for the reply. I've seen that video. Mr. Carlson's Lab is very informative and thorough. Sounds (kind of a pun) like a good idea. Can this be done accurately/reliably without an oscilloscope?

@NovaluxStereophonic 4 ай бұрын

@@stevenjackson8226If you are interested in his circuits consider subscribing to his patreon page. For the circuit he shows on KZbin and oscilloscope is needed.

@JimOltman 10 ай бұрын

I've got a Marantz 3300 with a bent corner due to shipping as well. How did you straighten that corner without damaging it? Great job on the restoration! Thanks!

@NovaluxStereophonic 10 ай бұрын

It’s never going to be perfect but a bench vise with a couple pieces of leather can go a long way to straighten things out. Better to grip and bend rather than cranking on the vise as that will compress the aluminum. Take it slow and use your best judgment. Good luck!

@LewpyDrewpy714 8 ай бұрын

This is the best rotisserie restore that I've seen in awhile. Keeping all the good parts. Replacement parts are to speck. Mostly. First fire up. The 7 was missing a little. Little fine tuning with better parts. Purrs like a kitten now. Fuel economy isn't that bad either. GGs.. Your testing bench is a Tech drool fest. What was the neutral load going back to your AC power supply? Just curious.

@mauricedemel6142 3 ай бұрын

What is the length and width of the main circuit board.

@sergej_santos 3 ай бұрын

cool dude

@jeremiahchamberlin4499 8 ай бұрын

Great job! I’m curious about the history of this unit in the Marantz line, and in the HiFi world generally. You may have assumed common knowledge, but I’m ignorant. Just curious.