The Marantz 2230 became a victim of my careless shorting of the output resistor to ground while checking BIAS. Several attempts were made to repair this channel, but they were in vain. The only way to recover use of this 2230 was with a Wondom amplifier implant served by the Marantz dedicated single rail power of 66 VDC (You might have seem my other thread rescuing a Mitsubishi DA-R35 with a similar Wondom PCB amp, actually have done two of those). This unit has three secondaries, one to run dial lights, one for pre and line stages and the radio, and a dedicated high amperage for the driver/power amp individual channel units.
I was able to use this single 66 VDC with the Wondom AA-AB32516 amplifier module that could receive up to 72 volts and output 500 watts at 4 ohms--even at lower 60 VDC voltage. I removed both original amp assemblies and their heat sinks, along with the main power cap and two channel output caps. I installed a small black walnut board to hold the Wondom as you see and removed all excess wiring. I was able to use only existing Marantz wiring to power the Wondom and the only wires added, unrelated, were to provide a dimming switch for the dial lighting. Hopefully, someone will be able to make sense of this and the photos below in case another 2230 finds itself in the same predicament. May I add that the sound is fantastic and modern. Some may find the cooling fan noise a bit annoying since it cycles on/off, but eventually you forget about it.
A bit of the fat magic of the Marantz sound is gone, but not all. Treble is way improved and so is focus of sound, probably due to improved speed of class D. I will eventually add a wiring diagram. Some pictures for now.
BTW, after several days, no pops or smoke, and another 2230 saved from a dusty shelf.
I was able to use this single 66 VDC with the Wondom AA-AB32516 amplifier module that could receive up to 72 volts and output 500 watts at 4 ohms--even at lower 60 VDC voltage. I removed both original amp assemblies and their heat sinks, along with the main power cap and two channel output caps. I installed a small black walnut board to hold the Wondom as you see and removed all excess wiring. I was able to use only existing Marantz wiring to power the Wondom and the only wires added, unrelated, were to provide a dimming switch for the dial lighting. Hopefully, someone will be able to make sense of this and the photos below in case another 2230 finds itself in the same predicament. May I add that the sound is fantastic and modern. Some may find the cooling fan noise a bit annoying since it cycles on/off, but eventually you forget about it.
A bit of the fat magic of the Marantz sound is gone, but not all. Treble is way improved and so is focus of sound, probably due to improved speed of class D. I will eventually add a wiring diagram. Some pictures for now.
BTW, after several days, no pops or smoke, and another 2230 saved from a dusty shelf.
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