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Marantz model 250 power amplifier in excellent condition. Rare USA made model. Classic Marantz warmth and decade spanning reliability. Rated at 125 watts RMS per channel into 8 ohms and 150 watts RMS into 4 ohms. This unit has been serviced and fully tested. Our original Performance Verification Report and a copy of the owner's manual included.
From Marantz:With flawless high power and utter reliability, the Model 250 is ideally suited for the most sophisticated stereo systems.
This Model 250 has been modified as follows:
- AC power fed through IEC grounded receptacle with in-line Cornell Dubilier Radio Frequency Interference Filter.
- Binding Post Speaker connectors.
- Binding Post Ground connector.
- Mono RCA input jack.
- The original 20,000uF 60V power supply capacitors have been replaced with massive 37,000uF 75V Sangamo.
Q: Why replace the filter caps with super large ones?
A: OK, here's the deal. With virtually all high quality amplifiers the main filter capacitors are much larger in value than is required for the filtering of AC ripple from the rectifiers. Only a small percentage of the actual value is required for adequate filtering. The rest of the capacitance is used for energy storage. During very dynamic musical content, such as a drum kit, very high amounts of current are needed for a very short period of time. The time it takes to pull that current from the AC wall outlet, through the power transformer, through the rectifiers and filtering is too long to fully capture the dynamic transient. It is much faster to pull the current directly from the capacitors where it is stored. This results in improved dynamics and a better sonic representation. In theory, the bigger the capacitors the greater the dynamic potential.
This particular 250 was used for commercial sound reinforcement. Modified no doubt to improve it's ability to reproduce the dynamics of live instruments.
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Controls:
Left Channel Meter: Off, 0dB, +20dB
Right Channel Meter: Off, 0dB, +20dBclassicaudio.comIndicators:
Left Channel Level dB/VU
Right Channel Level dB/VUclassicaudio.comRear Panel:
AC Outlet Unswitchedclassicaudio.com
Input Right
Input Leftclassicaudio.com
Speaker Systems (R, L)Shipping Weight 40 lbs.
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$899.95
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ClassicAudio.com
Phone 916-488-6016 or
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Buyer to pay item purchase price plus shipping charges from 95609.
Shipping charges will depend on the item purchased and delivery destination.
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Shipping to the U.S. only.
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This item includes our 60 day / 2 year limited warranty!
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Main power supply caps were removed from the circuit and tested as good.
All other electrolytic capacitors were replaced.
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