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Another snubber/power switch question

HH-Bham

HH-Bham

Well-Known Member
Should I replace the snubber on my 2252 with a new part that came with my power switch?

I've been cleaning up a 2252 that I came across and just replaced the power switch. Power was always on, and as it turns out, a hack job had been done and switch had just been disconnected and wires soldered together. I bought this power switch off ebay and have installed it -- working fine. The switch came with an "arc suppression cap" and listing says:

"When replacing a power switch always replace the old arc suppression capacitor. Most arc suppression caps are located across the power switch terminals however some models have this cap mounted across the switched AC receptacle on the rear panel."

The original snubber is labeled ".1uF + 120" ohm, which is consistent with my research here, and schematic which shows cap and resistor.

New "arc suppression cap" is labeled ".33pF 275V" and as far as I can tell no mention of resistors. It does have X2 designation. Pictures of new part (posed on heat sinks for convenience and lighting) are attached.

Keep original? Replace with this new part? Replace with different part? (Edit to add: I've seen the other thread. Just doesn't seem the "new" part that came with my new switch is right and also wondering about the need to replace the original snubber.)

Thanks for any advice. This is my first post on this Marantz forum. Now that I've read the excellent service manual and been inside the unit, I'm a big Marantz fan -- quality unit. Looking forward to giving it a good listen tomorrow.IMG_0199.jpgIMG_0206.jpg
 
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Thank you Steven. Yes, I did see that thread. I've edited the original post to note that and also to add: "Just doesn't seem the "new" part that came with my new switch is right and also wondering about the need to replace the original snubber."
 
I am not an expert in this -- hopefully one will chime in. But if I were replacing a switch, I would replace the snubber with a new one. That's a pretty heavy use component. After 40 years, it likely needs to be replaced.
 
It's a 120 ohm resistor - probably wouldn't make a hill of beans difference though. The .33uF cap would be better than nothing! I've seen straight up caps in some Marantz units, the snubber resistor side of it isn't always in the design. John Kutzler made a study of it 1-2 months ago although I don't recall the conclusions made. The primary of the transformer would seem to be a key part of the circuit, being a sizable inductor to collapse when powered off. If you're a masochist, look up theory on EMF and more so "back EMF". Thanks and credit to Tom AKA 'Catrafter' for the recent reminder of this being the force at work. My recommendation is to mimic whatever was there and where it was found to be mounted.
 
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