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#1
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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#2
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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#3
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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#4
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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