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#1
January 26th 08, 07:21 PM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
Here's some pics of a Marantze 250 I'm working on. It was a real mess and
had been droped. I straitend the cabinet and repainted everything etc... I replaced every electrolytic and several other type caps and resistors. I rebuilt the powere supply relay and replaced three transistors. -- Regards B.H. Hill Amplification http://hillamplification.com Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm ZUMBROTA, MN USA Ph- 507-732-4737 |
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#2
January 26th 08, 07:33 PM
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marantz 250 amp early 70s
Here it is almost done. -- Regards B.H. Hill Amplification http://hillamplification.com Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm |
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#3
January 27th 08, 03:00 AM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
"Brian Hill" wrote in message ... Here it is almost done. -- Regards B.H. Hill Amplification http://hillamplification.com Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm wow, looks like lots of work, despite the fairly open look of the various boards. You had to completely take one out? |
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#4
January 27th 08, 06:52 AM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
"Buck Frobisher" wrote in message ... "Brian Hill" wrote in message ... Here it is almost done. -- Regards B.H. Hill Amplification http://hillamplification.com Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm wow, looks like lots of work, despite the fairly open look of the various boards. You had to completely take one out? Yea I had to go over it all. The main failure was that a number of carbon comp resistors went south in the HV circuits and the voltage went way up frying a few transistors etc... So I replaced all the carbon comps and most of the capacitors minus the mica types which all tested good. The circuit boards are all very robust being about 3/16" thick with heavy trace. It's a nice well designed amp. I rebuilt the power supply relay too and hope it works? I give it the smoke test tomarrow! BH |
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#5
January 28th 08, 04:47 AM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
----- Original Message -----
From: "Brian Hill" Newsgroups: alt.binaries.pictures.radio Sent: Sunday, January 27, 2008 1:52 AM Subject: marantz 250 amp early 70s "Buck Frobisher" wrote in message ... "Brian Hill" wrote in message ... Here it is almost done. -- Regards B.H. Hill Amplification http://hillamplification.com Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm wow, looks like lots of work, despite the fairly open look of the various boards. You had to completely take one out? Yea I had to go over it all. The main failure was that a number of carbon comp resistors went south in the HV circuits and the voltage went way up frying a few transistors etc... So I replaced all the carbon comps and most of the capacitors minus the mica types which all tested good. The circuit boards are all very robust being about 3/16" thick with heavy trace. It's a nice well designed amp. I rebuilt the power supply relay too and hope it works? I give it the smoke test tomarrow! BH Good luck! that should last you for another 30-40 years... |
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#6
February 2nd 08, 07:11 PM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
"Buck Frobisher" wrote in message Good luck! that should last you for another 30-40 years... I hope so Buck. BH |
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#7
February 2nd 08, 07:11 PM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
"Buck Frobisher" wrote in message Good luck! that should last you for another 30-40 years... I hope so Buck. BH |
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#8
February 2nd 08, 07:11 PM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
"Buck Frobisher" wrote in message Good luck! that should last you for another 30-40 years... I hope so Buck. BH |
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#9
February 13th 08, 09:03 PM
posted to alt.binaries.pictures.radio
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marantz 250 amp early 70s
In article , "Brian Hill"
wrote: Here's some pics of a Marantze 250 I'm working on. It was a real mess and had been droped. I straitend the cabinet and repainted everything etc... I replaced every electrolytic and several other type caps and resistors. I rebuilt the powere supply relay and replaced three transistors. -- Regards B.H. Hill Amplification http://hillamplification.com Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm ZUMBROTA, MN USA Ph- 507-732-4737 I remember those amps. They were good ones. Dave |
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