A friend bought a Marantz 2216B amp, i am helping him bring it back to life. The tuner section works fine, so there is hope.
I am looking at the schematic for the phono amp here:
As i read it C415/16 are the input caps, 1uF @ 50V polar electrolytic.
Can they be replaced by a non-polar cap? The same would apply, i think, to C401/02.
I am curious if this was a design decision, or a design restraint due to capacitor technology and cost at the time.
I am looking at the schematic for the phono amp here:
As i read it C415/16 are the input caps, 1uF @ 50V polar electrolytic.
Can they be replaced by a non-polar cap? The same would apply, i think, to C401/02.
I am curious if this was a design decision, or a design restraint due to capacitor technology and cost at the time.
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In my experience, if ANY of those Marantz amps or receivers have ANY of those small YELLOW wrapped electolytics in them - yank them OUT and replace them with a new electrolytic of the same "uF" value.
They are prone to leaking and troubles.
But you need not believe me, I've only got 45+ years in the audio/video service business.
They are prone to leaking and troubles.
But you need not believe me, I've only got 45+ years in the audio/video service business.
Yes. That was the standard approach at the time, and still is mostly.
Capacitors have become much smaller and better now.
Capacitors have become much smaller and better now.
Well, no, they aren't.
And: This is a uni-polar supply amplifier. Uni-polar caps are the perfect fit.
As pointed out there is DC across the capacitors, so using a bipolar electrolytic capacitor is a really bad idea.
However you can replace them with film capacitors if you can fit them in!
However you can replace them with film capacitors if you can fit them in!