Comments on: Rebuilding the Power Supply on a Vintage Amplifier http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/ Hold my beer while I try something. Sat, 04 Feb 2012 20:33:47 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Max http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-1880 Max Sat, 12 Mar 2011 19:46:36 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-1880 The manual is now posted here: http://blog.wingedvictorydesign.com/wp-content/uploads/2009/03/MAC1700_ser.zip Best of luck! The manual is now posted here:
http://blog.wingedvictorydesign.com/wp-content/uploads/2009/03/MAC1700_ser.zip

Best of luck!

]]> By: Dale http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-1878 Dale Tue, 08 Mar 2011 15:25:29 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-1878 Dear Max, Great job here. I found this in a search looking for hints on repairing a MAC 1700. It belonged to my father in law. he gave it to my sister in law when he bought a MAC 4100 years ago. The 1700 got pretty well trashed by kids over the years (broken face plate, grime). Anyhow, the 4100 came to my family when Dad died and now the 1700 has come this way as well. This 1700 has a good working amp and preamp but the FM sounds horrible. My suspicion is tubes. I would really appreciate if you could send a copy of the service manual my way, can't seem to find it anywhere else. Thanks. Dale Dear Max,

Great job here. I found this in a search looking for hints on repairing a MAC 1700. It belonged to my father in law. he gave it to my sister in law when he bought a MAC 4100 years ago. The 1700 got pretty well trashed by kids over the years (broken face plate, grime). Anyhow, the 4100 came to my family when Dad died and now the 1700 has come this way as well. This 1700 has a good working amp and preamp but the FM sounds horrible. My suspicion is tubes. I would really appreciate if you could send a copy of the service manual my way, can’t seem to find it anywhere else.

Thanks.

Dale

]]> By: Kip Gynn http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-693 Kip Gynn Fri, 23 Apr 2010 15:19:38 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-693 Hi Max, It was very kind of you to create and publish this website. It has been very educational for me. I have a Mac 1700 textbook case of loud buzz at the speaker terminals and headphone output and about 3vDC as well. It just spontaniously happened yesterday after the unit had been on for about 8 hours. I have the schematic but not the service manual. If you would please email it to me I would really appreciate it. Also, I have a question. Would it be ok to disconnect the wires to the old cans and then put replacement caps in the chassis area underneath the old caps, rather than disassemble and rebuild the cans? Do you Think there would be room? Thank you for all your help! Kip Hi Max,
It was very kind of you to create and publish this website. It has been very educational for me.
I have a Mac 1700 textbook case of loud buzz at the speaker terminals and headphone output and about 3vDC as well. It just spontaniously happened yesterday after the unit had been on for about 8 hours. I have the schematic but not the service manual. If you would please email it to me I would really appreciate it. Also, I have a question. Would it be ok to disconnect the wires to the old cans and then put replacement caps in the chassis area underneath the old caps, rather than disassemble and rebuild the cans? Do you Think there would be room?
Thank you for all your help!
Kip

]]> By: Max http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-609 Max Sun, 17 Jan 2010 05:55:57 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-609 Best of luck Ken, I just sent a copy of the owners and service manual to the address you used to leave a comment. Hey for future people, if you want a the service or owner's manual e-mail is probably a little better way to contact me, I don't always see the comments right away. My e-mail address is in the "About Me" section. Best of luck Ken, I just sent a copy of the owners and service manual to the address you used to leave a comment.

Hey for future people, if you want a the service or owner’s manual e-mail is probably a little better way to contact me, I don’t always see the comments right away. My e-mail address is in the “About Me” section.

]]> By: Ken http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-607 Ken Thu, 14 Jan 2010 06:21:02 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-607 hi Max, Great blog on DIY MAC1700 recap. I just bought one. I will do the recap using your guide. I would really appreciate a copy of your service manual, as a back up in case I ran into issues. thanks in advance. Ken hi Max,

Great blog on DIY MAC1700 recap. I just bought one. I will do the recap using your guide. I would really appreciate a copy of your service manual, as a back up in case I ran into issues.
thanks in advance. Ken

]]> By: Max http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-175 Max Fri, 21 Aug 2009 04:09:22 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-175 Unfortunately, I can't seem to find the part numbers that I used--I might have bought them at an Electronics Part Outlet, rather than online. But they're just power rectification diodes, so as long as you equal or better the specs you'll be fine. The 1N4820 is easy because it turns up a datasheet with a Google search. For the 3988, I'd just work from first principles. AC (I assume you're in the US) is 120V, so there's your reverse voltage. From the owner's manual, you know that the max power draw is 270W = ~2.25A. So if you find a 'power' or 'rectification' (not 'signal') diode rated for, say, 300V max reverse voltage and 3A forward current, you're good. I think. Unfortunately, I can’t seem to find the part numbers that I used–I might have bought them at an Electronics Part Outlet, rather than online. But they’re just power rectification diodes, so as long as you equal or better the specs you’ll be fine.

The 1N4820 is easy because it turns up a datasheet with a Google search.

For the 3988, I’d just work from first principles. AC (I assume you’re in the US) is 120V, so there’s your reverse voltage. From the owner’s manual, you know that the max power draw is 270W = ~2.25A.

So if you find a ‘power’ or ‘rectification’ (not ‘signal’) diode rated for, say, 300V max reverse voltage and 3A forward current, you’re good. I think.

]]> By: dave http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-170 dave Sat, 15 Aug 2009 08:01:26 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-170 hope your leed thing turned out for you. i'm gradually working my way into the 1700 project(after some mixups with part shipments). i want to replace the diodes but can't find replacements-if you did the ones on your unit, what did you use? the #'s appear to be westinghouse 3988's and 1N4820's. my keyboard seems to be messing up, so i hope you get this, and thank you for taking the time to respond. dave hope your leed thing turned out for you. i’m gradually working my way into the 1700 project(after some mixups with part shipments). i want to replace the diodes but can’t find replacements-if you did the ones on your unit, what did you use? the #’s appear to be westinghouse 3988′s and 1N4820′s. my keyboard seems to be messing up, so i hope you get this, and thank you for taking the time to respond. dave

]]> By: Max http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-39 Max Wed, 13 May 2009 22:36:38 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-39 @dave: I sent a copy of the manual to the e-mail address you used to leave the comment. Send me an e-mail if you don't get it. @dave: I sent a copy of the manual to the e-mail address you used to leave the comment. Send me an e-mail if you don’t get it.

]]> By: dave http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-27 dave Wed, 06 May 2009 23:56:15 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-27 i would really appreciate a copy of the service manual as i suspect that i may need more than a recapping with this unit. i used it for about a year and it was great-then i started to get a choppiness in the left channel, so i put it away for later attention. i was using some jbl's with it, but now i have found some wharfedales which i want to try w/it. it's a piece that gives one a nice sense of satisfaction to have in one's system, so i'm gonna have to do what i can. i downloaded your parts list, but it is a .xsl(which i believe is a windows format) and i am a linux and mac osx guy, so i'll have to see what i can do-if the manual is pdf, that would be great, but if not, i'd still be more than grateful to get it and i will do what is necessary to access it's info-i have an old drive w/windows2000 which might do. thanx again, over the years, i have looked up a lot of technical stuff and i can tell you that persons who know their stuff are rare, but people who know their stuff and can relate that knowledge to others clearly and effectively are a real find. thanx. i would really appreciate a copy of the service manual as i suspect that i may need more than a recapping with this unit. i used it for about a year and it was great-then i started to get a choppiness in the left channel, so i put it away for later attention. i was using some jbl’s with it, but now i have found some wharfedales which i want to try w/it. it’s a piece that gives one a nice sense of satisfaction to have in one’s system, so i’m gonna have to do what i can. i downloaded your parts list, but it is a .xsl(which i believe is a windows format) and i am a linux and mac osx guy, so i’ll have to see what i can do-if the manual is pdf, that would be great, but if not, i’d still be more than grateful to get it and i will do what is necessary to access it’s info-i have an old drive w/windows2000 which might do.
thanx again, over the years, i have looked up a lot of technical stuff and i can tell you that persons who know their stuff are rare, but people who know their stuff and can relate that knowledge to others clearly and effectively are a real find. thanx.

]]> By: Max http://blog.wingedvictorydesign.com/2009/03/17/rebuilding-the-power-supply-in-a-mcintosh-mac1700/comment-page-1/#comment-18 Max Tue, 21 Apr 2009 22:23:08 +0000 http://blog.wingedvictorydesign.com/?p=30#comment-18 Glad you find it helpful! Note that the signal only passes through the tube section when you're using the FM tuner. So if your problem only occurs only when using the radio, it's definitely a tube problem, otherwise it's definitely a solid state problem. If you want to send me your e-mail address, I'll send you my copy of the 1700 service manual (which includes schematics and parts lists). Glad you find it helpful! Note that the signal only passes through the tube section when you’re using the FM tuner. So if your problem only occurs only when using the radio, it’s definitely a tube problem, otherwise it’s definitely a solid state problem. If you want to send me your e-mail address, I’ll send you my copy of the 1700 service manual (which includes schematics and parts lists).

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