Marantz 4220 upgrade and restoration info?

[mrwizard1us]

I'm looking for any kind of information about restoring or Rebuilding, a Marantz 4220?
I currently own 2 Mint condition (4220 Baby quads), I acquired at a great price from the original owners on eBay.
They appear to be working OK with minor issues from being unused for many years.(Scratchy and intermittent pots).
I plan on obviously cleaning up the pots and upgrading the lighting to LEDs
I'm hoping to get some information about what might be any capacitor, transistor and component upgrades or replacements, when I already have the unit opened to upgrade the Lighting.
I have the service manual.
I owned my first 4220 back in the 70s.
With my Bose 901s I run the 4220 at about 3/4 throttle or less, and don't need any greater then 20 watts .
The sound is incredible.
I fell in love with them back in the day.

 

[schoenradt]

I'm looking for any kind of information about restoring or Rebuilding, a Marantz 4220?
I currently own 2 Mint condition (4220 Baby quads), I acquired at a great price from the original owners on eBay.
They appear to be working OK with minor issues from being unused for many years.(Scratchy and intermittent pots).
I plan on obviously cleaning up the pots and upgrading the lighting to LEDs
I'm hoping to get some information about what might be any capacitor, transistor and component upgrades or replacements, when I already have the unit opened to upgrade the Lighting.
I have the service manual.
I owned my first 4220 back in the 70s.
With my Bose 901s I run the 4220 at about 3/4 throttle or less, and don't need any greater then 20 watts .
The sound is incredible.
I fell in love with them back in the day.

Like any Marantz restoration is important. Many of the OnSemi transistors are as good or better than the originals. On capacitors you may want to rebuild the tone board with Wima film capacitors. On the electrolytic capacitors use 10% tolerances with a temperature range of 105 degrees instead of the originals which are 85 degrees. I have from past restorations it's best to make a note when you pull capacitors from the board because they may not be the same value listed on the schematic, or parts list. All transistors is a great resource for substitution transistors. You'll be amazed at how good your receiver will sound after you restore it. As for the LED upgrade (peace.love.and.music) has very reasonable prices and a wide selection of colors as well as a good selection of rebuild kits with very precise instructions.

 

[stereofisher]

Good luck restoring. Low watts is all you need. Always liked low watt Marantz receivers.Have a 4415 quad as my bench amp. JBL 100s up front AR 4AX on the back. Sounds good. 15 watts. Have a 2220B with JBL Decade 26s. A 2010 with another pr of 26s. Retired my 2270 and 4270. The sound on those 4220 is awesome.

 

[AZBiker]

My only advice is to resolve any EXISTING issues before you start randomly replacing caps. If there are malfunctions, there's a reason for them. Using the shotgun approach isn't, "repair". It's a shot in the dark. So, if you have scratchy pots, etc. clean those first, then re-test. Once everything appears to function normally, then you can begin your restoration. Otherwise, if there are still issues after the fact, you'll be right back where you started, except you spent $100+ in parts using the shotgun approach. I'm saying this from experience.

 

[mrwizard1us]

Great information from all your wonderful people. I'm taking notes and bookmarking component sites.
I'm rather new to this, I have a good handle on electronics and I have the proper tools but I've never did any serious restoration. Because of health reasons I'm putting everything on hold for now, but I'm still taking notes and doing research.
I'm so glad I found this Forum!
I never realized there was such a wealth of information out there for our Marantz and other equipment.
Also do any of you folks know what's going on with Hifiengines com? I've been trying for months to create an account but I keep getting an error (Sorry, but registration is currently closed to new members.) is there site down or anybody know what's going on?
Thanks again folks take care.

 

[dankik]

is there site down or anybody know what's going on?

I have an existing account and as of this morning, I can still login and download manuals.

 

[schoenradt]

My only advice is to resolve any EXISTING issues before you start randomly replacing caps. If there are malfunctions, there's a reason for them. Using the shotgun approach isn't, "repair". It's a shot in the dark. So, if you have scratchy pots, etc. clean those first, then re-test. Once everything appears to function normally, then you can begin your restoration. Otherwise, if there are still issues after the fact, you'll be right back where you started, except you spent $100+ in parts using the shotgun approach. I'm saying this from experience.

I also have to agree, using the shotgun method will just end up replacing good components. Start with the potentiometers and switches. If you test the sweep range of the potentiometers with a DVM you will see it they are working smoothly. Also an oscilloscope will show you the waveform, but it's not impossible to see with a good DVM in the AC milivolt range. Also from experience always make a note when removing a capacitor, it's value and working voltage. You will discover the schematic and parts list doesn't always match up to your actual components.

 

[mslupczynski]

I'm looking for any kind of information about restoring or Rebuilding, a Marantz 4220?
I currently own 2 Mint condition (4220 Baby quads), I acquired at a great price from the original owners on eBay.
They appear to be working OK with minor issues from being unused for many years.(Scratchy and intermittent pots).
I plan on obviously cleaning up the pots and upgrading the lighting to LEDs
I'm hoping to get some information about what might be any capacitor, transistor and component upgrades or replacements, when I already have the unit opened to upgrade the Lighting.
I have the service manual.
I owned my first 4220 back in the 70s.
With my Bose 901s I run the 4220 at about 3/4 throttle or less, and don't need any greater then 20 watts .
The sound is incredible.
I fell in love with them back in the day.

With the search function not working I just spent 2 days looking for ANY threads for Marantz 4220... I'm glad you posted this. I have two of these 4220's and they are in excellent condition with some output issues. I've reviewed the schematic and am amazed at how much Marantz was able to pack into these units. The main output board in the center of the chassis doesn't seem to come out easily without some, what look like, preamp inputs, power inputs, etc., needing to be disconnected. But with the screws removed it does come up and tilt about 30 degrees for visual inspection and measurements, and removal of it can certainly be done if required. I'd also love to know how any of you seasoned enthusiasts have approached general trouble-shooting the 4220. I'm still learning and always try to absorb the great experiences shared here by those smarted than I.

 

[dankik]

You can use Google to search AK. Just type in something like "Audiokarma Marantz 4220" (and whatever specific you are looking for) and get a bunch of hits.

 

[kwayde]

Great information from all your wonderful people. I'm taking notes and bookmarking component sites.
I'm rather new to this, I have a good handle on electronics and I have the proper tools but I've never did any serious restoration. Because of health reasons I'm putting everything on hold for now, but I'm still taking notes and doing research.
I'm so glad I found this Forum!
I never realized there was such a wealth of information out there for our Marantz and other equipment.
Also do any of you folks know what's going on with Hifiengines com? I've been trying for months to create an account but I keep getting an error (Sorry, but registration is currently closed to new members.) is there site down or anybody know what's going on?
Thanks again folks take care.

You can find manuals right here in the Ak Database. Service bulletins too.

http://akdatabase.com/AKview/thumbnails.php?album=1&page=8

 

[schoenradt]

With the search function not working I just spent 2 days looking for ANY threads for Marantz 4220... I'm glad you posted this. I have two of these 4220's and they are in excellent condition with some output issues. I've reviewed the schematic and am amazed at how much Marantz was able to pack into these units. The main output board in the center of the chassis doesn't seem to come out easily without some, what look like, preamp inputs, power inputs, etc., needing to be disconnected. But with the screws removed it does come up and tilt about 30 degrees for visual inspection and measurements, and removal of it can certainly be done if required. I'd also love to know how any of you seasoned enthusiasts have approached general trouble-shooting the 4220. I'm still learning and always try to absorb the great experiences shared here by those smarted than I.View attachment 2861186

If you really want to do a great restore I would recommend reading through Oleg's restorations. He gives a very itemized list of before and after with great details of upgrades and substitute semiconductors. Also this site has a great database on substitute transistors for Marantz receivers.

 

[mrwizard1us]

Good luck restoring. Low watts is all you need. Always liked low watt Marantz receivers.Have a 4415 quad as my bench amp. JBL 100s up front AR 4AX on the back. Sounds good. 15 watts. Have a 2220B with JBL Decade 26s. A 2010 with another pr of 26s. Retired my 2270 and 4270. The sound on those 4220 is awesome.

This way I don't have to tighten up the furniture screws, or re-caulk the windows!!