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Marantz 250 help
Marantz 250 help
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Old 18th May 2019, 01:43 AM   #1
murillollirum is offline murillollirum  Brazil
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Join Date: Nov 2012
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Default Marantz 250 help

Need help finding out where to put the probe to get the bias measurement. I tried putting them at the collectors case as indicated at the 250M (mine is a 250) but can not get any voltage, also across the 15ohms resistors (48v there). I think the bias it's high cause the outputs are very warm. I tried the 10W adjust as Marantz advises but wanted to use my voltimeter and adjust to 22mV instead.
The second question it's about the damm VU meters. The left one it's totally dismantled, I only have the needle and the outside case, can I adapt another complete magnet and just change the needle?

IMG-20190517-225004-01-01-1 imgbb.com

Last edited by murillollirum; 18th May 2019 at 02:13 AM.
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Old 18th May 2019, 07:00 PM   #2
llwhtt is offline llwhtt  United States
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Measure across the .15 Ohm emitter resistors, a probe on each side of the resistor. Both the 250 and 250M should be the same.

Craig
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Old Yesterday, 12:54 AM   #3
murillollirum is offline murillollirum  Brazil
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Thx Craig.
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